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| <h1>Source code for airflow.executors.celery_executor</h1><div class="highlight"><pre> |
| <span></span><span class="c1">#</span> |
| <span class="c1"># Licensed to the Apache Software Foundation (ASF) under one</span> |
| <span class="c1"># or more contributor license agreements. See the NOTICE file</span> |
| <span class="c1"># distributed with this work for additional information</span> |
| <span class="c1"># regarding copyright ownership. The ASF licenses this file</span> |
| <span class="c1"># to you under the Apache License, Version 2.0 (the</span> |
| <span class="c1"># "License"); you may not use this file except in compliance</span> |
| <span class="c1"># with the License. You may obtain a copy of the License at</span> |
| <span class="c1">#</span> |
| <span class="c1"># http://www.apache.org/licenses/LICENSE-2.0</span> |
| <span class="c1">#</span> |
| <span class="c1"># Unless required by applicable law or agreed to in writing,</span> |
| <span class="c1"># software distributed under the License is distributed on an</span> |
| <span class="c1"># "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</span> |
| <span class="c1"># KIND, either express or implied. See the License for the</span> |
| <span class="c1"># specific language governing permissions and limitations</span> |
| <span class="c1"># under the License.</span> |
| <span class="sd">"""CeleryExecutor</span> |
| |
| <span class="sd">.. seealso::</span> |
| <span class="sd"> For more information on how the CeleryExecutor works, take a look at the guide:</span> |
| <span class="sd"> :ref:`executor:CeleryExecutor`</span> |
| <span class="sd">"""</span> |
| <span class="kn">import</span> <span class="nn">datetime</span> |
| <span class="kn">import</span> <span class="nn">logging</span> |
| <span class="kn">import</span> <span class="nn">math</span> |
| <span class="kn">import</span> <span class="nn">operator</span> |
| <span class="kn">import</span> <span class="nn">os</span> |
| <span class="kn">import</span> <span class="nn">subprocess</span> |
| <span class="kn">import</span> <span class="nn">time</span> |
| <span class="kn">import</span> <span class="nn">traceback</span> |
| <span class="kn">from</span> <span class="nn">collections</span> <span class="kn">import</span> <span class="n">OrderedDict</span> |
| <span class="kn">from</span> <span class="nn">multiprocessing</span> <span class="kn">import</span> <span class="n">Pool</span><span class="p">,</span> <span class="n">cpu_count</span> |
| <span class="kn">from</span> <span class="nn">typing</span> <span class="kn">import</span> <span class="n">Any</span><span class="p">,</span> <span class="n">Dict</span><span class="p">,</span> <span class="n">List</span><span class="p">,</span> <span class="n">Mapping</span><span class="p">,</span> <span class="n">MutableMapping</span><span class="p">,</span> <span class="n">Optional</span><span class="p">,</span> <span class="n">Set</span><span class="p">,</span> <span class="n">Tuple</span><span class="p">,</span> <span class="n">Union</span> |
| |
| <span class="kn">from</span> <span class="nn">celery</span> <span class="kn">import</span> <span class="n">Celery</span><span class="p">,</span> <span class="n">Task</span><span class="p">,</span> <span class="n">states</span> <span class="k">as</span> <span class="n">celery_states</span> |
| <span class="kn">from</span> <span class="nn">celery.backends.base</span> <span class="kn">import</span> <span class="n">BaseKeyValueStoreBackend</span> |
| <span class="kn">from</span> <span class="nn">celery.backends.database</span> <span class="kn">import</span> <span class="n">DatabaseBackend</span><span class="p">,</span> <span class="n">session_cleanup</span> |
| <span class="kn">from</span> <span class="nn">celery.result</span> <span class="kn">import</span> <span class="n">AsyncResult</span> |
| <span class="kn">from</span> <span class="nn">celery.signals</span> <span class="kn">import</span> <span class="n">import_modules</span> <span class="k">as</span> <span class="n">celery_import_modules</span> |
| <span class="kn">from</span> <span class="nn">setproctitle</span> <span class="kn">import</span> <span class="n">setproctitle</span> <span class="c1"># pylint: disable=no-name-in-module</span> |
| |
| <span class="kn">import</span> <span class="nn">airflow.settings</span> <span class="k">as</span> <span class="nn">settings</span> |
| <span class="kn">from</span> <span class="nn">airflow.config_templates.default_celery</span> <span class="kn">import</span> <span class="n">DEFAULT_CELERY_CONFIG</span> |
| <span class="kn">from</span> <span class="nn">airflow.configuration</span> <span class="kn">import</span> <span class="n">conf</span> |
| <span class="kn">from</span> <span class="nn">airflow.exceptions</span> <span class="kn">import</span> <span class="n">AirflowException</span><span class="p">,</span> <span class="n">AirflowTaskTimeout</span> |
| <span class="kn">from</span> <span class="nn">airflow.executors.base_executor</span> <span class="kn">import</span> <span class="n">BaseExecutor</span><span class="p">,</span> <span class="n">CommandType</span><span class="p">,</span> <span class="n">EventBufferValueType</span> |
| <span class="kn">from</span> <span class="nn">airflow.models.taskinstance</span> <span class="kn">import</span> <span class="n">SimpleTaskInstance</span><span class="p">,</span> <span class="n">TaskInstance</span><span class="p">,</span> <span class="n">TaskInstanceKey</span> |
| <span class="kn">from</span> <span class="nn">airflow.stats</span> <span class="kn">import</span> <span class="n">Stats</span> |
| <span class="kn">from</span> <span class="nn">airflow.utils.log.logging_mixin</span> <span class="kn">import</span> <span class="n">LoggingMixin</span> |
| <span class="kn">from</span> <span class="nn">airflow.utils.net</span> <span class="kn">import</span> <span class="n">get_hostname</span> |
| <span class="kn">from</span> <span class="nn">airflow.utils.state</span> <span class="kn">import</span> <span class="n">State</span> |
| <span class="kn">from</span> <span class="nn">airflow.utils.timeout</span> <span class="kn">import</span> <span class="n">timeout</span> |
| <span class="kn">from</span> <span class="nn">airflow.utils.timezone</span> <span class="kn">import</span> <span class="n">utcnow</span> |
| |
| <div class="viewcode-block" id="log"><a class="viewcode-back" href="../../../_api/airflow/executors/celery_executor/index.html#airflow.executors.celery_executor.log">[docs]</a><span class="n">log</span> <span class="o">=</span> <span class="n">logging</span><span class="o">.</span><span class="n">getLogger</span><span class="p">(</span><span class="vm">__name__</span><span class="p">)</span></div> |
| |
| <span class="c1"># Make it constant for unit test.</span> |
| <div class="viewcode-block" id="CELERY_FETCH_ERR_MSG_HEADER"><a class="viewcode-back" href="../../../_api/airflow/executors/celery_executor/index.html#airflow.executors.celery_executor.CELERY_FETCH_ERR_MSG_HEADER">[docs]</a><span class="n">CELERY_FETCH_ERR_MSG_HEADER</span> <span class="o">=</span> <span class="s1">'Error fetching Celery task state'</span></div> |
| |
| <div class="viewcode-block" id="CELERY_SEND_ERR_MSG_HEADER"><a class="viewcode-back" href="../../../_api/airflow/executors/celery_executor/index.html#airflow.executors.celery_executor.CELERY_SEND_ERR_MSG_HEADER">[docs]</a><span class="n">CELERY_SEND_ERR_MSG_HEADER</span> <span class="o">=</span> <span class="s1">'Error sending Celery task'</span></div> |
| |
| <div class="viewcode-block" id="OPERATION_TIMEOUT"><a class="viewcode-back" href="../../../_api/airflow/executors/celery_executor/index.html#airflow.executors.celery_executor.OPERATION_TIMEOUT">[docs]</a><span class="n">OPERATION_TIMEOUT</span> <span class="o">=</span> <span class="n">conf</span><span class="o">.</span><span class="n">getfloat</span><span class="p">(</span><span class="s1">'celery'</span><span class="p">,</span> <span class="s1">'operation_timeout'</span><span class="p">,</span> <span class="n">fallback</span><span class="o">=</span><span class="mf">1.0</span><span class="p">)</span></div> |
| |
| <span class="sd">'''</span> |
| <span class="sd">To start the celery worker, run the command:</span> |
| <span class="sd">airflow celery worker</span> |
| <span class="sd">'''</span> |
| |
| <span class="k">if</span> <span class="n">conf</span><span class="o">.</span><span class="n">has_option</span><span class="p">(</span><span class="s1">'celery'</span><span class="p">,</span> <span class="s1">'celery_config_options'</span><span class="p">):</span> |
| <div class="viewcode-block" id="celery_configuration"><a class="viewcode-back" href="../../../_api/airflow/executors/celery_executor/index.html#airflow.executors.celery_executor.celery_configuration">[docs]</a> <span class="n">celery_configuration</span> <span class="o">=</span> <span class="n">conf</span><span class="o">.</span><span class="n">getimport</span><span class="p">(</span><span class="s1">'celery'</span><span class="p">,</span> <span class="s1">'celery_config_options'</span><span class="p">)</span></div> |
| <span class="k">else</span><span class="p">:</span> |
| <span class="n">celery_configuration</span> <span class="o">=</span> <span class="n">DEFAULT_CELERY_CONFIG</span> |
| |
| <div class="viewcode-block" id="app"><a class="viewcode-back" href="../../../_api/airflow/executors/celery_executor/index.html#airflow.executors.celery_executor.app">[docs]</a><span class="n">app</span> <span class="o">=</span> <span class="n">Celery</span><span class="p">(</span><span class="n">conf</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'celery'</span><span class="p">,</span> <span class="s1">'CELERY_APP_NAME'</span><span class="p">),</span> <span class="n">config_source</span><span class="o">=</span><span class="n">celery_configuration</span><span class="p">)</span></div> |
| |
| |
| <span class="nd">@app</span><span class="o">.</span><span class="n">task</span> |
| <div class="viewcode-block" id="execute_command"><a class="viewcode-back" href="../../../_api/airflow/executors/celery_executor/index.html#airflow.executors.celery_executor.execute_command">[docs]</a><span class="k">def</span> <span class="nf">execute_command</span><span class="p">(</span><span class="n">command_to_exec</span><span class="p">:</span> <span class="n">CommandType</span><span class="p">)</span> <span class="o">-></span> <span class="kc">None</span><span class="p">:</span> |
| <span class="sd">"""Executes command."""</span> |
| <span class="n">BaseExecutor</span><span class="o">.</span><span class="n">validate_command</span><span class="p">(</span><span class="n">command_to_exec</span><span class="p">)</span> |
| <span class="n">log</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s2">"Executing command in Celery: </span><span class="si">%s</span><span class="s2">"</span><span class="p">,</span> <span class="n">command_to_exec</span><span class="p">)</span> |
| |
| <span class="k">if</span> <span class="n">settings</span><span class="o">.</span><span class="n">EXECUTE_TASKS_NEW_PYTHON_INTERPRETER</span><span class="p">:</span> |
| <span class="n">_execute_in_subprocess</span><span class="p">(</span><span class="n">command_to_exec</span><span class="p">)</span> |
| <span class="k">else</span><span class="p">:</span> |
| <span class="n">_execute_in_fork</span><span class="p">(</span><span class="n">command_to_exec</span><span class="p">)</span></div> |
| |
| |
| <div class="viewcode-block" id="_execute_in_fork"><a class="viewcode-back" href="../../../_api/airflow/executors/celery_executor/index.html#airflow.executors.celery_executor._execute_in_fork">[docs]</a><span class="k">def</span> <span class="nf">_execute_in_fork</span><span class="p">(</span><span class="n">command_to_exec</span><span class="p">:</span> <span class="n">CommandType</span><span class="p">)</span> <span class="o">-></span> <span class="kc">None</span><span class="p">:</span> |
| <span class="n">pid</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">fork</span><span class="p">()</span> |
| <span class="k">if</span> <span class="n">pid</span><span class="p">:</span> |
| <span class="c1"># In parent, wait for the child</span> |
| <span class="n">pid</span><span class="p">,</span> <span class="n">ret</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">waitpid</span><span class="p">(</span><span class="n">pid</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span> |
| <span class="k">if</span> <span class="n">ret</span> <span class="o">==</span> <span class="mi">0</span><span class="p">:</span> |
| <span class="k">return</span> |
| |
| <span class="k">raise</span> <span class="n">AirflowException</span><span class="p">(</span><span class="s1">'Celery command failed on host: '</span> <span class="o">+</span> <span class="n">get_hostname</span><span class="p">())</span> |
| |
| <span class="kn">from</span> <span class="nn">airflow.sentry</span> <span class="kn">import</span> <span class="n">Sentry</span> |
| |
| <span class="n">ret</span> <span class="o">=</span> <span class="mi">1</span> |
| <span class="k">try</span><span class="p">:</span> |
| <span class="kn">from</span> <span class="nn">airflow.cli.cli_parser</span> <span class="kn">import</span> <span class="n">get_parser</span> |
| |
| <span class="n">parser</span> <span class="o">=</span> <span class="n">get_parser</span><span class="p">()</span> |
| <span class="c1"># [1:] - remove "airflow" from the start of the command</span> |
| <span class="n">args</span> <span class="o">=</span> <span class="n">parser</span><span class="o">.</span><span class="n">parse_args</span><span class="p">(</span><span class="n">command_to_exec</span><span class="p">[</span><span class="mi">1</span><span class="p">:])</span> |
| <span class="n">args</span><span class="o">.</span><span class="n">shut_down_logging</span> <span class="o">=</span> <span class="kc">False</span> |
| |
| <span class="n">setproctitle</span><span class="p">(</span><span class="sa">f</span><span class="s2">"airflow task supervisor: </span><span class="si">{</span><span class="n">command_to_exec</span><span class="si">}</span><span class="s2">"</span><span class="p">)</span> |
| |
| <span class="n">args</span><span class="o">.</span><span class="n">func</span><span class="p">(</span><span class="n">args</span><span class="p">)</span> |
| <span class="n">ret</span> <span class="o">=</span> <span class="mi">0</span> |
| <span class="k">except</span> <span class="ne">Exception</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span> <span class="c1"># pylint: disable=broad-except</span> |
| <span class="n">log</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="s2">"Failed to execute task </span><span class="si">%s</span><span class="s2">."</span><span class="p">,</span> <span class="nb">str</span><span class="p">(</span><span class="n">e</span><span class="p">))</span> |
| <span class="n">ret</span> <span class="o">=</span> <span class="mi">1</span> |
| <span class="k">finally</span><span class="p">:</span> |
| <span class="n">Sentry</span><span class="o">.</span><span class="n">flush</span><span class="p">()</span> |
| <span class="n">logging</span><span class="o">.</span><span class="n">shutdown</span><span class="p">()</span> |
| <span class="n">os</span><span class="o">.</span><span class="n">_exit</span><span class="p">(</span><span class="n">ret</span><span class="p">)</span> <span class="c1"># pylint: disable=protected-access</span></div> |
| |
| |
| <div class="viewcode-block" id="_execute_in_subprocess"><a class="viewcode-back" href="../../../_api/airflow/executors/celery_executor/index.html#airflow.executors.celery_executor._execute_in_subprocess">[docs]</a><span class="k">def</span> <span class="nf">_execute_in_subprocess</span><span class="p">(</span><span class="n">command_to_exec</span><span class="p">:</span> <span class="n">CommandType</span><span class="p">)</span> <span class="o">-></span> <span class="kc">None</span><span class="p">:</span> |
| <span class="n">env</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">environ</span><span class="o">.</span><span class="n">copy</span><span class="p">()</span> |
| <span class="k">try</span><span class="p">:</span> |
| <span class="c1"># pylint: disable=unexpected-keyword-arg</span> |
| <span class="n">subprocess</span><span class="o">.</span><span class="n">check_output</span><span class="p">(</span><span class="n">command_to_exec</span><span class="p">,</span> <span class="n">stderr</span><span class="o">=</span><span class="n">subprocess</span><span class="o">.</span><span class="n">STDOUT</span><span class="p">,</span> <span class="n">close_fds</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="n">env</span><span class="o">=</span><span class="n">env</span><span class="p">)</span> |
| <span class="c1"># pylint: disable=unexpected-keyword-arg</span> |
| <span class="k">except</span> <span class="n">subprocess</span><span class="o">.</span><span class="n">CalledProcessError</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span> |
| <span class="n">log</span><span class="o">.</span><span class="n">exception</span><span class="p">(</span><span class="s1">'execute_command encountered a CalledProcessError'</span><span class="p">)</span> |
| <span class="n">log</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="n">e</span><span class="o">.</span><span class="n">output</span><span class="p">)</span> |
| <span class="n">msg</span> <span class="o">=</span> <span class="s1">'Celery command failed on host: '</span> <span class="o">+</span> <span class="n">get_hostname</span><span class="p">()</span> |
| <span class="k">raise</span> <span class="n">AirflowException</span><span class="p">(</span><span class="n">msg</span><span class="p">)</span></div> |
| |
| |
| <div class="viewcode-block" id="ExceptionWithTraceback"><a class="viewcode-back" href="../../../_api/airflow/executors/celery_executor/index.html#airflow.executors.celery_executor.ExceptionWithTraceback">[docs]</a><span class="k">class</span> <span class="nc">ExceptionWithTraceback</span><span class="p">:</span> |
| <span class="sd">"""</span> |
| <span class="sd"> Wrapper class used to propagate exceptions to parent processes from subprocesses.</span> |
| |
| <span class="sd"> :param exception: The exception to wrap</span> |
| <span class="sd"> :type exception: Exception</span> |
| <span class="sd"> :param exception_traceback: The stacktrace to wrap</span> |
| <span class="sd"> :type exception_traceback: str</span> |
| <span class="sd"> """</span> |
| |
| <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">exception</span><span class="p">:</span> <span class="ne">Exception</span><span class="p">,</span> <span class="n">exception_traceback</span><span class="p">:</span> <span class="nb">str</span><span class="p">):</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">exception</span> <span class="o">=</span> <span class="n">exception</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">traceback</span> <span class="o">=</span> <span class="n">exception_traceback</span></div> |
| |
| |
| <span class="c1"># Task instance that is sent over Celery queues</span> |
| <span class="c1"># TaskInstanceKey, SimpleTaskInstance, Command, queue_name, CallableTask</span> |
| <div class="viewcode-block" id="TaskInstanceInCelery"><a class="viewcode-back" href="../../../_api/airflow/executors/celery_executor/index.html#airflow.executors.celery_executor.TaskInstanceInCelery">[docs]</a><span class="n">TaskInstanceInCelery</span> <span class="o">=</span> <span class="n">Tuple</span><span class="p">[</span><span class="n">TaskInstanceKey</span><span class="p">,</span> <span class="n">SimpleTaskInstance</span><span class="p">,</span> <span class="n">CommandType</span><span class="p">,</span> <span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">],</span> <span class="n">Task</span><span class="p">]</span></div> |
| |
| |
| <div class="viewcode-block" id="send_task_to_executor"><a class="viewcode-back" href="../../../_api/airflow/executors/celery_executor/index.html#airflow.executors.celery_executor.send_task_to_executor">[docs]</a><span class="k">def</span> <span class="nf">send_task_to_executor</span><span class="p">(</span> |
| <span class="n">task_tuple</span><span class="p">:</span> <span class="n">TaskInstanceInCelery</span><span class="p">,</span> |
| <span class="p">)</span> <span class="o">-></span> <span class="n">Tuple</span><span class="p">[</span><span class="n">TaskInstanceKey</span><span class="p">,</span> <span class="n">CommandType</span><span class="p">,</span> <span class="n">Union</span><span class="p">[</span><span class="n">AsyncResult</span><span class="p">,</span> <span class="n">ExceptionWithTraceback</span><span class="p">]]:</span> |
| <span class="sd">"""Sends task to executor."""</span> |
| <span class="n">key</span><span class="p">,</span> <span class="n">_</span><span class="p">,</span> <span class="n">command</span><span class="p">,</span> <span class="n">queue</span><span class="p">,</span> <span class="n">task_to_run</span> <span class="o">=</span> <span class="n">task_tuple</span> |
| <span class="k">try</span><span class="p">:</span> |
| <span class="k">with</span> <span class="n">timeout</span><span class="p">(</span><span class="n">seconds</span><span class="o">=</span><span class="n">OPERATION_TIMEOUT</span><span class="p">):</span> |
| <span class="n">result</span> <span class="o">=</span> <span class="n">task_to_run</span><span class="o">.</span><span class="n">apply_async</span><span class="p">(</span><span class="n">args</span><span class="o">=</span><span class="p">[</span><span class="n">command</span><span class="p">],</span> <span class="n">queue</span><span class="o">=</span><span class="n">queue</span><span class="p">)</span> |
| <span class="k">except</span> <span class="ne">Exception</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span> <span class="c1"># pylint: disable=broad-except</span> |
| <span class="n">exception_traceback</span> <span class="o">=</span> <span class="sa">f</span><span class="s2">"Celery Task ID: </span><span class="si">{</span><span class="n">key</span><span class="si">}</span><span class="se">\n</span><span class="si">{</span><span class="n">traceback</span><span class="o">.</span><span class="n">format_exc</span><span class="p">()</span><span class="si">}</span><span class="s2">"</span> |
| <span class="n">result</span> <span class="o">=</span> <span class="n">ExceptionWithTraceback</span><span class="p">(</span><span class="n">e</span><span class="p">,</span> <span class="n">exception_traceback</span><span class="p">)</span> |
| |
| <span class="k">return</span> <span class="n">key</span><span class="p">,</span> <span class="n">command</span><span class="p">,</span> <span class="n">result</span></div> |
| |
| |
| <span class="c1"># pylint: disable=unused-import</span> |
| <span class="nd">@celery_import_modules</span><span class="o">.</span><span class="n">connect</span> |
| <div class="viewcode-block" id="on_celery_import_modules"><a class="viewcode-back" href="../../../_api/airflow/executors/celery_executor/index.html#airflow.executors.celery_executor.on_celery_import_modules">[docs]</a><span class="k">def</span> <span class="nf">on_celery_import_modules</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span> |
| <span class="sd">"""</span> |
| <span class="sd"> Preload some "expensive" airflow modules so that every task process doesn't have to import it again and</span> |
| <span class="sd"> again.</span> |
| |
| <span class="sd"> Loading these for each task adds 0.3-0.5s *per task* before the task can run. For long running tasks this</span> |
| <span class="sd"> doesn't matter, but for short tasks this starts to be a noticeable impact.</span> |
| <span class="sd"> """</span> |
| <span class="kn">import</span> <span class="nn">jinja2.ext</span> <span class="c1"># noqa: F401</span> |
| <span class="kn">import</span> <span class="nn">numpy</span> <span class="c1"># noqa: F401</span> |
| |
| <span class="kn">import</span> <span class="nn">airflow.jobs.local_task_job</span> |
| <span class="kn">import</span> <span class="nn">airflow.macros</span> |
| <span class="kn">import</span> <span class="nn">airflow.operators.bash</span> |
| <span class="kn">import</span> <span class="nn">airflow.operators.python</span> |
| <span class="kn">import</span> <span class="nn">airflow.operators.subdag</span> <span class="c1"># noqa: F401</span> |
| |
| <span class="k">try</span><span class="p">:</span> |
| <span class="kn">import</span> <span class="nn">kubernetes.client</span> <span class="c1"># noqa: F401</span> |
| <span class="k">except</span> <span class="ne">ImportError</span><span class="p">:</span> |
| <span class="k">pass</span></div> |
| |
| |
| <span class="c1"># pylint: enable=unused-import</span> |
| |
| |
| <div class="viewcode-block" id="CeleryExecutor"><a class="viewcode-back" href="../../../_api/airflow/executors/celery_executor/index.html#airflow.executors.celery_executor.CeleryExecutor">[docs]</a><span class="k">class</span> <span class="nc">CeleryExecutor</span><span class="p">(</span><span class="n">BaseExecutor</span><span class="p">):</span> |
| <span class="sd">"""</span> |
| <span class="sd"> CeleryExecutor is recommended for production use of Airflow. It allows</span> |
| <span class="sd"> distributing the execution of task instances to multiple worker nodes.</span> |
| |
| <span class="sd"> Celery is a simple, flexible and reliable distributed system to process</span> |
| <span class="sd"> vast amounts of messages, while providing operations with the tools</span> |
| <span class="sd"> required to maintain such a system.</span> |
| <span class="sd"> """</span> |
| |
| <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> |
| <span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="fm">__init__</span><span class="p">()</span> |
| |
| <span class="c1"># Celery doesn't support bulk sending the tasks (which can become a bottleneck on bigger clusters)</span> |
| <span class="c1"># so we use a multiprocessing pool to speed this up.</span> |
| <span class="c1"># How many worker processes are created for checking celery task state.</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_sync_parallelism</span> <span class="o">=</span> <span class="n">conf</span><span class="o">.</span><span class="n">getint</span><span class="p">(</span><span class="s1">'celery'</span><span class="p">,</span> <span class="s1">'SYNC_PARALLELISM'</span><span class="p">)</span> |
| <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_sync_parallelism</span> <span class="o">==</span> <span class="mi">0</span><span class="p">:</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_sync_parallelism</span> <span class="o">=</span> <span class="nb">max</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="n">cpu_count</span><span class="p">()</span> <span class="o">-</span> <span class="mi">1</span><span class="p">)</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">bulk_state_fetcher</span> <span class="o">=</span> <span class="n">BulkStateFetcher</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_sync_parallelism</span><span class="p">)</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">tasks</span> <span class="o">=</span> <span class="p">{}</span> |
| <span class="c1"># Mapping of tasks we've adopted, ordered by the earliest date they timeout</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">adopted_task_timeouts</span><span class="p">:</span> <span class="n">Dict</span><span class="p">[</span><span class="n">TaskInstanceKey</span><span class="p">,</span> <span class="n">datetime</span><span class="o">.</span><span class="n">datetime</span><span class="p">]</span> <span class="o">=</span> <span class="n">OrderedDict</span><span class="p">()</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">task_adoption_timeout</span> <span class="o">=</span> <span class="n">datetime</span><span class="o">.</span><span class="n">timedelta</span><span class="p">(</span> |
| <span class="n">seconds</span><span class="o">=</span><span class="n">conf</span><span class="o">.</span><span class="n">getint</span><span class="p">(</span><span class="s1">'celery'</span><span class="p">,</span> <span class="s1">'task_adoption_timeout'</span><span class="p">,</span> <span class="n">fallback</span><span class="o">=</span><span class="mi">600</span><span class="p">)</span> |
| <span class="p">)</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">task_publish_retries</span><span class="p">:</span> <span class="n">Dict</span><span class="p">[</span><span class="n">TaskInstanceKey</span><span class="p">,</span> <span class="nb">int</span><span class="p">]</span> <span class="o">=</span> <span class="n">OrderedDict</span><span class="p">()</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">task_publish_max_retries</span> <span class="o">=</span> <span class="n">conf</span><span class="o">.</span><span class="n">getint</span><span class="p">(</span><span class="s1">'celery'</span><span class="p">,</span> <span class="s1">'task_publish_max_retries'</span><span class="p">,</span> <span class="n">fallback</span><span class="o">=</span><span class="mi">3</span><span class="p">)</span> |
| |
| <div class="viewcode-block" id="CeleryExecutor.start"><a class="viewcode-back" href="../../../_api/airflow/executors/celery_executor/index.html#airflow.executors.celery_executor.CeleryExecutor.start">[docs]</a> <span class="k">def</span> <span class="nf">start</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-></span> <span class="kc">None</span><span class="p">:</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">log</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s1">'Starting Celery Executor using </span><span class="si">%s</span><span class="s1"> processes for syncing'</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_sync_parallelism</span><span class="p">)</span></div> |
| |
| <div class="viewcode-block" id="CeleryExecutor._num_tasks_per_send_process"><a class="viewcode-back" href="../../../_api/airflow/executors/celery_executor/index.html#airflow.executors.celery_executor.CeleryExecutor._num_tasks_per_send_process">[docs]</a> <span class="k">def</span> <span class="nf">_num_tasks_per_send_process</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">to_send_count</span><span class="p">:</span> <span class="nb">int</span><span class="p">)</span> <span class="o">-></span> <span class="nb">int</span><span class="p">:</span> |
| <span class="sd">"""</span> |
| <span class="sd"> How many Celery tasks should each worker process send.</span> |
| |
| <span class="sd"> :return: Number of tasks that should be sent per process</span> |
| <span class="sd"> :rtype: int</span> |
| <span class="sd"> """</span> |
| <span class="k">return</span> <span class="nb">max</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="nb">int</span><span class="p">(</span><span class="n">math</span><span class="o">.</span><span class="n">ceil</span><span class="p">(</span><span class="mf">1.0</span> <span class="o">*</span> <span class="n">to_send_count</span> <span class="o">/</span> <span class="bp">self</span><span class="o">.</span><span class="n">_sync_parallelism</span><span class="p">)))</span></div> |
| |
| <div class="viewcode-block" id="CeleryExecutor.trigger_tasks"><a class="viewcode-back" href="../../../_api/airflow/executors/celery_executor/index.html#airflow.executors.celery_executor.CeleryExecutor.trigger_tasks">[docs]</a> <span class="k">def</span> <span class="nf">trigger_tasks</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">open_slots</span><span class="p">:</span> <span class="nb">int</span><span class="p">)</span> <span class="o">-></span> <span class="kc">None</span><span class="p">:</span> |
| <span class="sd">"""</span> |
| <span class="sd"> Overwrite trigger_tasks function from BaseExecutor</span> |
| |
| <span class="sd"> :param open_slots: Number of open slots</span> |
| <span class="sd"> :return:</span> |
| <span class="sd"> """</span> |
| <span class="n">sorted_queue</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">order_queued_tasks_by_priority</span><span class="p">()</span> |
| |
| <span class="n">task_tuples_to_send</span><span class="p">:</span> <span class="n">List</span><span class="p">[</span><span class="n">TaskInstanceInCelery</span><span class="p">]</span> <span class="o">=</span> <span class="p">[]</span> |
| |
| <span class="k">for</span> <span class="n">_</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="nb">min</span><span class="p">(</span><span class="n">open_slots</span><span class="p">,</span> <span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">queued_tasks</span><span class="p">))):</span> |
| <span class="n">key</span><span class="p">,</span> <span class="p">(</span><span class="n">command</span><span class="p">,</span> <span class="n">_</span><span class="p">,</span> <span class="n">queue</span><span class="p">,</span> <span class="n">simple_ti</span><span class="p">)</span> <span class="o">=</span> <span class="n">sorted_queue</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span> |
| <span class="n">task_tuple</span> <span class="o">=</span> <span class="p">(</span><span class="n">key</span><span class="p">,</span> <span class="n">simple_ti</span><span class="p">,</span> <span class="n">command</span><span class="p">,</span> <span class="n">queue</span><span class="p">,</span> <span class="n">execute_command</span><span class="p">)</span> |
| <span class="n">task_tuples_to_send</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">task_tuple</span><span class="p">)</span> |
| <span class="k">if</span> <span class="n">key</span> <span class="ow">not</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">task_publish_retries</span><span class="p">:</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">task_publish_retries</span><span class="p">[</span><span class="n">key</span><span class="p">]</span> <span class="o">=</span> <span class="mi">1</span> |
| |
| <span class="k">if</span> <span class="n">task_tuples_to_send</span><span class="p">:</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_process_tasks</span><span class="p">(</span><span class="n">task_tuples_to_send</span><span class="p">)</span></div> |
| |
| <div class="viewcode-block" id="CeleryExecutor._process_tasks"><a class="viewcode-back" href="../../../_api/airflow/executors/celery_executor/index.html#airflow.executors.celery_executor.CeleryExecutor._process_tasks">[docs]</a> <span class="k">def</span> <span class="nf">_process_tasks</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">task_tuples_to_send</span><span class="p">:</span> <span class="n">List</span><span class="p">[</span><span class="n">TaskInstanceInCelery</span><span class="p">])</span> <span class="o">-></span> <span class="kc">None</span><span class="p">:</span> |
| <span class="n">first_task</span> <span class="o">=</span> <span class="nb">next</span><span class="p">(</span><span class="n">t</span><span class="p">[</span><span class="mi">4</span><span class="p">]</span> <span class="k">for</span> <span class="n">t</span> <span class="ow">in</span> <span class="n">task_tuples_to_send</span><span class="p">)</span> |
| |
| <span class="c1"># Celery state queries will stuck if we do not use one same backend</span> |
| <span class="c1"># for all tasks.</span> |
| <span class="n">cached_celery_backend</span> <span class="o">=</span> <span class="n">first_task</span><span class="o">.</span><span class="n">backend</span> |
| |
| <span class="n">key_and_async_results</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_send_tasks_to_celery</span><span class="p">(</span><span class="n">task_tuples_to_send</span><span class="p">)</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">log</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s1">'Sent all tasks.'</span><span class="p">)</span> |
| |
| <span class="k">for</span> <span class="n">key</span><span class="p">,</span> <span class="n">_</span><span class="p">,</span> <span class="n">result</span> <span class="ow">in</span> <span class="n">key_and_async_results</span><span class="p">:</span> |
| <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">result</span><span class="p">,</span> <span class="n">ExceptionWithTraceback</span><span class="p">)</span> <span class="ow">and</span> <span class="nb">isinstance</span><span class="p">(</span> |
| <span class="n">result</span><span class="o">.</span><span class="n">exception</span><span class="p">,</span> <span class="n">AirflowTaskTimeout</span> |
| <span class="p">):</span> |
| <span class="k">if</span> <span class="n">key</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">task_publish_retries</span> <span class="ow">and</span> <span class="p">(</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">task_publish_retries</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">key</span><span class="p">)</span> <span class="o"><=</span> <span class="bp">self</span><span class="o">.</span><span class="n">task_publish_max_retries</span> |
| <span class="p">):</span> |
| <span class="n">Stats</span><span class="o">.</span><span class="n">incr</span><span class="p">(</span><span class="s2">"celery.task_timeout_error"</span><span class="p">)</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">log</span><span class="o">.</span><span class="n">info</span><span class="p">(</span> |
| <span class="s2">"[Try </span><span class="si">%s</span><span class="s2"> of </span><span class="si">%s</span><span class="s2">] Task Timeout Error for Task: (</span><span class="si">%s</span><span class="s2">)."</span><span class="p">,</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">task_publish_retries</span><span class="p">[</span><span class="n">key</span><span class="p">],</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">task_publish_max_retries</span><span class="p">,</span> |
| <span class="n">key</span><span class="p">,</span> |
| <span class="p">)</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">task_publish_retries</span><span class="p">[</span><span class="n">key</span><span class="p">]</span> <span class="o">+=</span> <span class="mi">1</span> |
| <span class="k">continue</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">queued_tasks</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="n">key</span><span class="p">)</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">task_publish_retries</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="n">key</span><span class="p">)</span> |
| <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">result</span><span class="p">,</span> <span class="n">ExceptionWithTraceback</span><span class="p">):</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">log</span><span class="o">.</span><span class="n">error</span><span class="p">(</span> <span class="c1"># pylint: disable=logging-not-lazy</span> |
| <span class="n">CELERY_SEND_ERR_MSG_HEADER</span> <span class="o">+</span> <span class="s2">": </span><span class="si">%s</span><span class="se">\n</span><span class="si">%s</span><span class="se">\n</span><span class="s2">"</span><span class="p">,</span> <span class="n">result</span><span class="o">.</span><span class="n">exception</span><span class="p">,</span> <span class="n">result</span><span class="o">.</span><span class="n">traceback</span> |
| <span class="p">)</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">event_buffer</span><span class="p">[</span><span class="n">key</span><span class="p">]</span> <span class="o">=</span> <span class="p">(</span><span class="n">State</span><span class="o">.</span><span class="n">FAILED</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span> |
| <span class="k">elif</span> <span class="n">result</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span> |
| <span class="n">result</span><span class="o">.</span><span class="n">backend</span> <span class="o">=</span> <span class="n">cached_celery_backend</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">running</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">key</span><span class="p">)</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">tasks</span><span class="p">[</span><span class="n">key</span><span class="p">]</span> <span class="o">=</span> <span class="n">result</span> |
| |
| <span class="c1"># Store the Celery task_id in the event buffer. This will get "overwritten" if the task</span> |
| <span class="c1"># has another event, but that is fine, because the only other events are success/failed at</span> |
| <span class="c1"># which point we don't need the ID anymore anyway</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">event_buffer</span><span class="p">[</span><span class="n">key</span><span class="p">]</span> <span class="o">=</span> <span class="p">(</span><span class="n">State</span><span class="o">.</span><span class="n">QUEUED</span><span class="p">,</span> <span class="n">result</span><span class="o">.</span><span class="n">task_id</span><span class="p">)</span> |
| |
| <span class="c1"># If the task runs _really quickly_ we may already have a result!</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">update_task_state</span><span class="p">(</span><span class="n">key</span><span class="p">,</span> <span class="n">result</span><span class="o">.</span><span class="n">state</span><span class="p">,</span> <span class="nb">getattr</span><span class="p">(</span><span class="n">result</span><span class="p">,</span> <span class="s1">'info'</span><span class="p">,</span> <span class="kc">None</span><span class="p">))</span></div> |
| |
| <div class="viewcode-block" id="CeleryExecutor._send_tasks_to_celery"><a class="viewcode-back" href="../../../_api/airflow/executors/celery_executor/index.html#airflow.executors.celery_executor.CeleryExecutor._send_tasks_to_celery">[docs]</a> <span class="k">def</span> <span class="nf">_send_tasks_to_celery</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">task_tuples_to_send</span><span class="p">:</span> <span class="n">List</span><span class="p">[</span><span class="n">TaskInstanceInCelery</span><span class="p">]):</span> |
| <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">task_tuples_to_send</span><span class="p">)</span> <span class="o">==</span> <span class="mi">1</span> <span class="ow">or</span> <span class="bp">self</span><span class="o">.</span><span class="n">_sync_parallelism</span> <span class="o">==</span> <span class="mi">1</span><span class="p">:</span> |
| <span class="c1"># One tuple, or max one process -> send it in the main thread.</span> |
| <span class="k">return</span> <span class="nb">list</span><span class="p">(</span><span class="nb">map</span><span class="p">(</span><span class="n">send_task_to_executor</span><span class="p">,</span> <span class="n">task_tuples_to_send</span><span class="p">))</span> |
| |
| <span class="c1"># Use chunks instead of a work queue to reduce context switching</span> |
| <span class="c1"># since tasks are roughly uniform in size</span> |
| <span class="n">chunksize</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_num_tasks_per_send_process</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="n">task_tuples_to_send</span><span class="p">))</span> |
| <span class="n">num_processes</span> <span class="o">=</span> <span class="nb">min</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="n">task_tuples_to_send</span><span class="p">),</span> <span class="bp">self</span><span class="o">.</span><span class="n">_sync_parallelism</span><span class="p">)</span> |
| |
| <span class="k">def</span> <span class="nf">reset_signals</span><span class="p">():</span> |
| <span class="c1"># Since we are run from inside the SchedulerJob, we don't to</span> |
| <span class="c1"># inherit the signal handlers that we registered there.</span> |
| <span class="kn">import</span> <span class="nn">signal</span> |
| |
| <span class="n">signal</span><span class="o">.</span><span class="n">signal</span><span class="p">(</span><span class="n">signal</span><span class="o">.</span><span class="n">SIGINT</span><span class="p">,</span> <span class="n">signal</span><span class="o">.</span><span class="n">SIG_DFL</span><span class="p">)</span> |
| <span class="n">signal</span><span class="o">.</span><span class="n">signal</span><span class="p">(</span><span class="n">signal</span><span class="o">.</span><span class="n">SIGTERM</span><span class="p">,</span> <span class="n">signal</span><span class="o">.</span><span class="n">SIG_DFL</span><span class="p">)</span> |
| <span class="n">signal</span><span class="o">.</span><span class="n">signal</span><span class="p">(</span><span class="n">signal</span><span class="o">.</span><span class="n">SIGUSR2</span><span class="p">,</span> <span class="n">signal</span><span class="o">.</span><span class="n">SIG_DFL</span><span class="p">)</span> |
| |
| <span class="k">with</span> <span class="n">Pool</span><span class="p">(</span><span class="n">processes</span><span class="o">=</span><span class="n">num_processes</span><span class="p">,</span> <span class="n">initializer</span><span class="o">=</span><span class="n">reset_signals</span><span class="p">)</span> <span class="k">as</span> <span class="n">send_pool</span><span class="p">:</span> |
| <span class="n">key_and_async_results</span> <span class="o">=</span> <span class="n">send_pool</span><span class="o">.</span><span class="n">map</span><span class="p">(</span> |
| <span class="n">send_task_to_executor</span><span class="p">,</span> <span class="n">task_tuples_to_send</span><span class="p">,</span> <span class="n">chunksize</span><span class="o">=</span><span class="n">chunksize</span> |
| <span class="p">)</span> |
| <span class="k">return</span> <span class="n">key_and_async_results</span></div> |
| |
| <div class="viewcode-block" id="CeleryExecutor.sync"><a class="viewcode-back" href="../../../_api/airflow/executors/celery_executor/index.html#airflow.executors.celery_executor.CeleryExecutor.sync">[docs]</a> <span class="k">def</span> <span class="nf">sync</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-></span> <span class="kc">None</span><span class="p">:</span> |
| <span class="k">if</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">tasks</span><span class="p">:</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">log</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s2">"No task to query celery, skipping sync"</span><span class="p">)</span> |
| <span class="k">return</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">update_all_task_states</span><span class="p">()</span> |
| |
| <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">adopted_task_timeouts</span><span class="p">:</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_check_for_stalled_adopted_tasks</span><span class="p">()</span></div> |
| |
| <div class="viewcode-block" id="CeleryExecutor._check_for_stalled_adopted_tasks"><a class="viewcode-back" href="../../../_api/airflow/executors/celery_executor/index.html#airflow.executors.celery_executor.CeleryExecutor._check_for_stalled_adopted_tasks">[docs]</a> <span class="k">def</span> <span class="nf">_check_for_stalled_adopted_tasks</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> |
| <span class="sd">"""</span> |
| <span class="sd"> See if any of the tasks we adopted from another Executor run have not</span> |
| <span class="sd"> progressed after the configured timeout.</span> |
| |
| <span class="sd"> If they haven't, they likely never made it to Celery, and we should</span> |
| <span class="sd"> just resend them. We do that by clearing the state and letting the</span> |
| <span class="sd"> normal scheduler loop deal with that</span> |
| <span class="sd"> """</span> |
| <span class="n">now</span> <span class="o">=</span> <span class="n">utcnow</span><span class="p">()</span> |
| |
| <span class="n">timedout_keys</span> <span class="o">=</span> <span class="p">[]</span> |
| <span class="k">for</span> <span class="n">key</span><span class="p">,</span> <span class="n">stalled_after</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">adopted_task_timeouts</span><span class="o">.</span><span class="n">items</span><span class="p">():</span> |
| <span class="k">if</span> <span class="n">stalled_after</span> <span class="o">></span> <span class="n">now</span><span class="p">:</span> |
| <span class="c1"># Since items are stored sorted, if we get to a stalled_after</span> |
| <span class="c1"># in the future then we can stop</span> |
| <span class="k">break</span> |
| |
| <span class="c1"># If the task gets updated to STARTED (which Celery does) or has</span> |
| <span class="c1"># already finished, then it will be removed from this list -- so</span> |
| <span class="c1"># the only time it's still in this list is when it a) never made it</span> |
| <span class="c1"># to celery in the first place (i.e. race condition somehwere in</span> |
| <span class="c1"># the dying executor) or b) a really long celery queue and it just</span> |
| <span class="c1"># hasn't started yet -- better cancel it and let the scheduler</span> |
| <span class="c1"># re-queue rather than have this task risk stalling for ever</span> |
| <span class="n">timedout_keys</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">key</span><span class="p">)</span> |
| |
| <span class="k">if</span> <span class="n">timedout_keys</span><span class="p">:</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">log</span><span class="o">.</span><span class="n">error</span><span class="p">(</span> |
| <span class="s2">"Adopted tasks were still pending after </span><span class="si">%s</span><span class="s2">, assuming they never made it to celery and "</span> |
| <span class="s2">"clearing:</span><span class="se">\n\t</span><span class="si">%s</span><span class="s2">"</span><span class="p">,</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">task_adoption_timeout</span><span class="p">,</span> |
| <span class="s2">"</span><span class="se">\n\t</span><span class="s2">"</span><span class="o">.</span><span class="n">join</span><span class="p">([</span><span class="nb">repr</span><span class="p">(</span><span class="n">x</span><span class="p">)</span> <span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="n">timedout_keys</span><span class="p">]),</span> |
| <span class="p">)</span> |
| <span class="k">for</span> <span class="n">key</span> <span class="ow">in</span> <span class="n">timedout_keys</span><span class="p">:</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">event_buffer</span><span class="p">[</span><span class="n">key</span><span class="p">]</span> <span class="o">=</span> <span class="p">(</span><span class="n">State</span><span class="o">.</span><span class="n">FAILED</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span> |
| <span class="k">del</span> <span class="bp">self</span><span class="o">.</span><span class="n">tasks</span><span class="p">[</span><span class="n">key</span><span class="p">]</span> |
| <span class="k">del</span> <span class="bp">self</span><span class="o">.</span><span class="n">adopted_task_timeouts</span><span class="p">[</span><span class="n">key</span><span class="p">]</span></div> |
| |
| <div class="viewcode-block" id="CeleryExecutor.debug_dump"><a class="viewcode-back" href="../../../_api/airflow/executors/celery_executor/index.html#airflow.executors.celery_executor.CeleryExecutor.debug_dump">[docs]</a> <span class="k">def</span> <span class="nf">debug_dump</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-></span> <span class="kc">None</span><span class="p">:</span> |
| <span class="sd">"""Called in response to SIGUSR2 by the scheduler"""</span> |
| <span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="n">debug_dump</span><span class="p">()</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">log</span><span class="o">.</span><span class="n">info</span><span class="p">(</span> |
| <span class="s2">"executor.tasks (</span><span class="si">%d</span><span class="s2">)</span><span class="se">\n\t</span><span class="si">%s</span><span class="s2">"</span><span class="p">,</span> <span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">tasks</span><span class="p">),</span> <span class="s2">"</span><span class="se">\n\t</span><span class="s2">"</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="nb">map</span><span class="p">(</span><span class="nb">repr</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">tasks</span><span class="o">.</span><span class="n">items</span><span class="p">()))</span> |
| <span class="p">)</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">log</span><span class="o">.</span><span class="n">info</span><span class="p">(</span> |
| <span class="s2">"executor.adopted_task_timeouts (</span><span class="si">%d</span><span class="s2">)</span><span class="se">\n\t</span><span class="si">%s</span><span class="s2">"</span><span class="p">,</span> |
| <span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">adopted_task_timeouts</span><span class="p">),</span> |
| <span class="s2">"</span><span class="se">\n\t</span><span class="s2">"</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="nb">map</span><span class="p">(</span><span class="nb">repr</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">adopted_task_timeouts</span><span class="o">.</span><span class="n">items</span><span class="p">())),</span></div> |
| <span class="p">)</span> |
| |
| <div class="viewcode-block" id="CeleryExecutor.update_all_task_states"><a class="viewcode-back" href="../../../_api/airflow/executors/celery_executor/index.html#airflow.executors.celery_executor.CeleryExecutor.update_all_task_states">[docs]</a> <span class="k">def</span> <span class="nf">update_all_task_states</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-></span> <span class="kc">None</span><span class="p">:</span> |
| <span class="sd">"""Updates states of the tasks."""</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">log</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s2">"Inquiring about </span><span class="si">%s</span><span class="s2"> celery task(s)"</span><span class="p">,</span> <span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">tasks</span><span class="p">))</span> |
| <span class="n">state_and_info_by_celery_task_id</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">bulk_state_fetcher</span><span class="o">.</span><span class="n">get_many</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">tasks</span><span class="o">.</span><span class="n">values</span><span class="p">())</span> |
| |
| <span class="bp">self</span><span class="o">.</span><span class="n">log</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s2">"Inquiries completed."</span><span class="p">)</span> |
| <span class="k">for</span> <span class="n">key</span><span class="p">,</span> <span class="n">async_result</span> <span class="ow">in</span> <span class="nb">list</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">tasks</span><span class="o">.</span><span class="n">items</span><span class="p">()):</span> |
| <span class="n">state</span><span class="p">,</span> <span class="n">info</span> <span class="o">=</span> <span class="n">state_and_info_by_celery_task_id</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">async_result</span><span class="o">.</span><span class="n">task_id</span><span class="p">)</span> |
| <span class="k">if</span> <span class="n">state</span><span class="p">:</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">update_task_state</span><span class="p">(</span><span class="n">key</span><span class="p">,</span> <span class="n">state</span><span class="p">,</span> <span class="n">info</span><span class="p">)</span></div> |
| |
| <div class="viewcode-block" id="CeleryExecutor.change_state"><a class="viewcode-back" href="../../../_api/airflow/executors/celery_executor/index.html#airflow.executors.celery_executor.CeleryExecutor.change_state">[docs]</a> <span class="k">def</span> <span class="nf">change_state</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">key</span><span class="p">:</span> <span class="n">TaskInstanceKey</span><span class="p">,</span> <span class="n">state</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span> <span class="n">info</span><span class="o">=</span><span class="kc">None</span><span class="p">)</span> <span class="o">-></span> <span class="kc">None</span><span class="p">:</span> |
| <span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="n">change_state</span><span class="p">(</span><span class="n">key</span><span class="p">,</span> <span class="n">state</span><span class="p">,</span> <span class="n">info</span><span class="p">)</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">tasks</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="n">key</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">adopted_task_timeouts</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="n">key</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span></div> |
| |
| <div class="viewcode-block" id="CeleryExecutor.update_task_state"><a class="viewcode-back" href="../../../_api/airflow/executors/celery_executor/index.html#airflow.executors.celery_executor.CeleryExecutor.update_task_state">[docs]</a> <span class="k">def</span> <span class="nf">update_task_state</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">key</span><span class="p">:</span> <span class="n">TaskInstanceKey</span><span class="p">,</span> <span class="n">state</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span> <span class="n">info</span><span class="p">:</span> <span class="n">Any</span><span class="p">)</span> <span class="o">-></span> <span class="kc">None</span><span class="p">:</span> |
| <span class="sd">"""Updates state of a single task."""</span> |
| <span class="k">try</span><span class="p">:</span> |
| <span class="k">if</span> <span class="n">state</span> <span class="o">==</span> <span class="n">celery_states</span><span class="o">.</span><span class="n">SUCCESS</span><span class="p">:</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">success</span><span class="p">(</span><span class="n">key</span><span class="p">,</span> <span class="n">info</span><span class="p">)</span> |
| <span class="k">elif</span> <span class="n">state</span> <span class="ow">in</span> <span class="p">(</span><span class="n">celery_states</span><span class="o">.</span><span class="n">FAILURE</span><span class="p">,</span> <span class="n">celery_states</span><span class="o">.</span><span class="n">REVOKED</span><span class="p">):</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">fail</span><span class="p">(</span><span class="n">key</span><span class="p">,</span> <span class="n">info</span><span class="p">)</span> |
| <span class="k">elif</span> <span class="n">state</span> <span class="o">==</span> <span class="n">celery_states</span><span class="o">.</span><span class="n">STARTED</span><span class="p">:</span> |
| <span class="c1"># It's now actually running, so know it made it to celery okay!</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">adopted_task_timeouts</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="n">key</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span> |
| <span class="k">elif</span> <span class="n">state</span> <span class="o">==</span> <span class="n">celery_states</span><span class="o">.</span><span class="n">PENDING</span><span class="p">:</span> |
| <span class="k">pass</span> |
| <span class="k">else</span><span class="p">:</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">log</span><span class="o">.</span><span class="n">info</span><span class="p">(</span><span class="s2">"Unexpected state for </span><span class="si">%s</span><span class="s2">: </span><span class="si">%s</span><span class="s2">"</span><span class="p">,</span> <span class="n">key</span><span class="p">,</span> <span class="n">state</span><span class="p">)</span> |
| <span class="k">except</span> <span class="ne">Exception</span><span class="p">:</span> <span class="c1"># noqa pylint: disable=broad-except</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">log</span><span class="o">.</span><span class="n">exception</span><span class="p">(</span><span class="s2">"Error syncing the Celery executor, ignoring it."</span><span class="p">)</span></div> |
| |
| <div class="viewcode-block" id="CeleryExecutor.end"><a class="viewcode-back" href="../../../_api/airflow/executors/celery_executor/index.html#airflow.executors.celery_executor.CeleryExecutor.end">[docs]</a> <span class="k">def</span> <span class="nf">end</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">synchronous</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">False</span><span class="p">)</span> <span class="o">-></span> <span class="kc">None</span><span class="p">:</span> |
| <span class="k">if</span> <span class="n">synchronous</span><span class="p">:</span> |
| <span class="k">while</span> <span class="nb">any</span><span class="p">(</span><span class="n">task</span><span class="o">.</span><span class="n">state</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">celery_states</span><span class="o">.</span><span class="n">READY_STATES</span> <span class="k">for</span> <span class="n">task</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">tasks</span><span class="o">.</span><span class="n">values</span><span class="p">()):</span> |
| <span class="n">time</span><span class="o">.</span><span class="n">sleep</span><span class="p">(</span><span class="mi">5</span><span class="p">)</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">sync</span><span class="p">()</span></div> |
| |
| <div class="viewcode-block" id="CeleryExecutor.execute_async"><a class="viewcode-back" href="../../../_api/airflow/executors/celery_executor/index.html#airflow.executors.celery_executor.CeleryExecutor.execute_async">[docs]</a> <span class="k">def</span> <span class="nf">execute_async</span><span class="p">(</span> |
| <span class="bp">self</span><span class="p">,</span> |
| <span class="n">key</span><span class="p">:</span> <span class="n">TaskInstanceKey</span><span class="p">,</span> |
| <span class="n">command</span><span class="p">:</span> <span class="n">CommandType</span><span class="p">,</span> |
| <span class="n">queue</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span> |
| <span class="n">executor_config</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="n">Any</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span> |
| <span class="p">):</span> |
| <span class="sd">"""Do not allow async execution for Celery executor."""</span> |
| <span class="k">raise</span> <span class="n">AirflowException</span><span class="p">(</span><span class="s2">"No Async execution for Celery executor."</span><span class="p">)</span></div> |
| |
| <div class="viewcode-block" id="CeleryExecutor.terminate"><a class="viewcode-back" href="../../../_api/airflow/executors/celery_executor/index.html#airflow.executors.celery_executor.CeleryExecutor.terminate">[docs]</a> <span class="k">def</span> <span class="nf">terminate</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> |
| <span class="k">pass</span></div> |
| |
| <div class="viewcode-block" id="CeleryExecutor.try_adopt_task_instances"><a class="viewcode-back" href="../../../_api/airflow/executors/celery_executor/index.html#airflow.executors.celery_executor.CeleryExecutor.try_adopt_task_instances">[docs]</a> <span class="k">def</span> <span class="nf">try_adopt_task_instances</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">tis</span><span class="p">:</span> <span class="n">List</span><span class="p">[</span><span class="n">TaskInstance</span><span class="p">])</span> <span class="o">-></span> <span class="n">List</span><span class="p">[</span><span class="n">TaskInstance</span><span class="p">]:</span> |
| <span class="c1"># See which of the TIs are still alive (or have finished even!)</span> |
| <span class="c1">#</span> |
| <span class="c1"># Since Celery doesn't store "SENT" state for queued commands (if we create an AsyncResult with a made</span> |
| <span class="c1"># up id it just returns PENDING state for it), we have to store Celery's task_id against the TI row to</span> |
| <span class="c1"># look at in future.</span> |
| <span class="c1">#</span> |
| <span class="c1"># This process is not perfect -- we could have sent the task to celery, and crashed before we were</span> |
| <span class="c1"># able to record the AsyncResult.task_id in the TaskInstance table, in which case we won't adopt the</span> |
| <span class="c1"># task (it'll either run and update the TI state, or the scheduler will clear and re-queue it. Either</span> |
| <span class="c1"># way it won't get executed more than once)</span> |
| <span class="c1">#</span> |
| <span class="c1"># (If we swapped it around, and generated a task_id for Celery, stored that in TI and enqueued that</span> |
| <span class="c1"># there is also still a race condition where we could generate and store the task_id, but die before</span> |
| <span class="c1"># we managed to enqueue the command. Since neither way is perfect we always have to deal with this</span> |
| <span class="c1"># process not being perfect.)</span> |
| |
| <span class="n">celery_tasks</span> <span class="o">=</span> <span class="p">{}</span> |
| <span class="n">not_adopted_tis</span> <span class="o">=</span> <span class="p">[]</span> |
| |
| <span class="k">for</span> <span class="n">ti</span> <span class="ow">in</span> <span class="n">tis</span><span class="p">:</span> |
| <span class="k">if</span> <span class="n">ti</span><span class="o">.</span><span class="n">external_executor_id</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span> |
| <span class="n">celery_tasks</span><span class="p">[</span><span class="n">ti</span><span class="o">.</span><span class="n">external_executor_id</span><span class="p">]</span> <span class="o">=</span> <span class="p">(</span><span class="n">AsyncResult</span><span class="p">(</span><span class="n">ti</span><span class="o">.</span><span class="n">external_executor_id</span><span class="p">),</span> <span class="n">ti</span><span class="p">)</span> |
| <span class="k">else</span><span class="p">:</span> |
| <span class="n">not_adopted_tis</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">ti</span><span class="p">)</span> |
| |
| <span class="k">if</span> <span class="ow">not</span> <span class="n">celery_tasks</span><span class="p">:</span> |
| <span class="c1"># Nothing to adopt</span> |
| <span class="k">return</span> <span class="n">tis</span> |
| |
| <span class="n">states_by_celery_task_id</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">bulk_state_fetcher</span><span class="o">.</span><span class="n">get_many</span><span class="p">(</span> |
| <span class="nb">map</span><span class="p">(</span><span class="n">operator</span><span class="o">.</span><span class="n">itemgetter</span><span class="p">(</span><span class="mi">0</span><span class="p">),</span> <span class="n">celery_tasks</span><span class="o">.</span><span class="n">values</span><span class="p">())</span> |
| <span class="p">)</span> |
| |
| <span class="n">adopted</span> <span class="o">=</span> <span class="p">[]</span> |
| <span class="n">cached_celery_backend</span> <span class="o">=</span> <span class="nb">next</span><span class="p">(</span><span class="nb">iter</span><span class="p">(</span><span class="n">celery_tasks</span><span class="o">.</span><span class="n">values</span><span class="p">()))[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">backend</span> |
| |
| <span class="k">for</span> <span class="n">celery_task_id</span><span class="p">,</span> <span class="p">(</span><span class="n">state</span><span class="p">,</span> <span class="n">info</span><span class="p">)</span> <span class="ow">in</span> <span class="n">states_by_celery_task_id</span><span class="o">.</span><span class="n">items</span><span class="p">():</span> |
| <span class="n">result</span><span class="p">,</span> <span class="n">ti</span> <span class="o">=</span> <span class="n">celery_tasks</span><span class="p">[</span><span class="n">celery_task_id</span><span class="p">]</span> |
| <span class="n">result</span><span class="o">.</span><span class="n">backend</span> <span class="o">=</span> <span class="n">cached_celery_backend</span> |
| |
| <span class="c1"># Set the correct elements of the state dicts, then update this</span> |
| <span class="c1"># like we just queried it.</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">adopted_task_timeouts</span><span class="p">[</span><span class="n">ti</span><span class="o">.</span><span class="n">key</span><span class="p">]</span> <span class="o">=</span> <span class="n">ti</span><span class="o">.</span><span class="n">queued_dttm</span> <span class="o">+</span> <span class="bp">self</span><span class="o">.</span><span class="n">task_adoption_timeout</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">tasks</span><span class="p">[</span><span class="n">ti</span><span class="o">.</span><span class="n">key</span><span class="p">]</span> <span class="o">=</span> <span class="n">result</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">running</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">ti</span><span class="o">.</span><span class="n">key</span><span class="p">)</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">update_task_state</span><span class="p">(</span><span class="n">ti</span><span class="o">.</span><span class="n">key</span><span class="p">,</span> <span class="n">state</span><span class="p">,</span> <span class="n">info</span><span class="p">)</span> |
| <span class="n">adopted</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="sa">f</span><span class="s2">"</span><span class="si">{</span><span class="n">ti</span><span class="si">}</span><span class="s2"> in state </span><span class="si">{</span><span class="n">state</span><span class="si">}</span><span class="s2">"</span><span class="p">)</span> |
| |
| <span class="k">if</span> <span class="n">adopted</span><span class="p">:</span> |
| <span class="n">task_instance_str</span> <span class="o">=</span> <span class="s1">'</span><span class="se">\n\t</span><span class="s1">'</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">adopted</span><span class="p">)</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">log</span><span class="o">.</span><span class="n">info</span><span class="p">(</span> |
| <span class="s2">"Adopted the following </span><span class="si">%d</span><span class="s2"> tasks from a dead executor</span><span class="se">\n\t</span><span class="si">%s</span><span class="s2">"</span><span class="p">,</span> <span class="nb">len</span><span class="p">(</span><span class="n">adopted</span><span class="p">),</span> <span class="n">task_instance_str</span> |
| <span class="p">)</span> |
| |
| <span class="k">return</span> <span class="n">not_adopted_tis</span></div></div> |
| |
| |
| <div class="viewcode-block" id="fetch_celery_task_state"><a class="viewcode-back" href="../../../_api/airflow/executors/celery_executor/index.html#airflow.executors.celery_executor.fetch_celery_task_state">[docs]</a><span class="k">def</span> <span class="nf">fetch_celery_task_state</span><span class="p">(</span><span class="n">async_result</span><span class="p">:</span> <span class="n">AsyncResult</span><span class="p">)</span> <span class="o">-></span> <span class="n">Tuple</span><span class="p">[</span><span class="nb">str</span><span class="p">,</span> <span class="n">Union</span><span class="p">[</span><span class="nb">str</span><span class="p">,</span> <span class="n">ExceptionWithTraceback</span><span class="p">],</span> <span class="n">Any</span><span class="p">]:</span> |
| <span class="sd">"""</span> |
| <span class="sd"> Fetch and return the state of the given celery task. The scope of this function is</span> |
| <span class="sd"> global so that it can be called by subprocesses in the pool.</span> |
| |
| <span class="sd"> :param async_result: a tuple of the Celery task key and the async Celery object used</span> |
| <span class="sd"> to fetch the task's state</span> |
| <span class="sd"> :type async_result: tuple(str, celery.result.AsyncResult)</span> |
| <span class="sd"> :return: a tuple of the Celery task key and the Celery state and the celery info</span> |
| <span class="sd"> of the task</span> |
| <span class="sd"> :rtype: tuple[str, str, str]</span> |
| <span class="sd"> """</span> |
| <span class="k">try</span><span class="p">:</span> |
| <span class="k">with</span> <span class="n">timeout</span><span class="p">(</span><span class="n">seconds</span><span class="o">=</span><span class="n">OPERATION_TIMEOUT</span><span class="p">):</span> |
| <span class="c1"># Accessing state property of celery task will make actual network request</span> |
| <span class="c1"># to get the current state of the task</span> |
| <span class="n">info</span> <span class="o">=</span> <span class="n">async_result</span><span class="o">.</span><span class="n">info</span> <span class="k">if</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">async_result</span><span class="p">,</span> <span class="s1">'info'</span><span class="p">)</span> <span class="k">else</span> <span class="kc">None</span> |
| <span class="k">return</span> <span class="n">async_result</span><span class="o">.</span><span class="n">task_id</span><span class="p">,</span> <span class="n">async_result</span><span class="o">.</span><span class="n">state</span><span class="p">,</span> <span class="n">info</span> |
| <span class="k">except</span> <span class="ne">Exception</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span> <span class="c1"># pylint: disable=broad-except</span> |
| <span class="n">exception_traceback</span> <span class="o">=</span> <span class="sa">f</span><span class="s2">"Celery Task ID: </span><span class="si">{</span><span class="n">async_result</span><span class="si">}</span><span class="se">\n</span><span class="si">{</span><span class="n">traceback</span><span class="o">.</span><span class="n">format_exc</span><span class="p">()</span><span class="si">}</span><span class="s2">"</span> |
| <span class="k">return</span> <span class="n">async_result</span><span class="o">.</span><span class="n">task_id</span><span class="p">,</span> <span class="n">ExceptionWithTraceback</span><span class="p">(</span><span class="n">e</span><span class="p">,</span> <span class="n">exception_traceback</span><span class="p">),</span> <span class="kc">None</span></div> |
| |
| |
| <div class="viewcode-block" id="_tasks_list_to_task_ids"><a class="viewcode-back" href="../../../_api/airflow/executors/celery_executor/index.html#airflow.executors.celery_executor._tasks_list_to_task_ids">[docs]</a><span class="k">def</span> <span class="nf">_tasks_list_to_task_ids</span><span class="p">(</span><span class="n">async_tasks</span><span class="p">)</span> <span class="o">-></span> <span class="n">Set</span><span class="p">[</span><span class="nb">str</span><span class="p">]:</span> |
| <span class="k">return</span> <span class="p">{</span><span class="n">a</span><span class="o">.</span><span class="n">task_id</span> <span class="k">for</span> <span class="n">a</span> <span class="ow">in</span> <span class="n">async_tasks</span><span class="p">}</span></div> |
| |
| |
| <div class="viewcode-block" id="BulkStateFetcher"><a class="viewcode-back" href="../../../_api/airflow/executors/celery_executor/index.html#airflow.executors.celery_executor.BulkStateFetcher">[docs]</a><span class="k">class</span> <span class="nc">BulkStateFetcher</span><span class="p">(</span><span class="n">LoggingMixin</span><span class="p">):</span> |
| <span class="sd">"""</span> |
| <span class="sd"> Gets status for many Celery tasks using the best method available</span> |
| |
| <span class="sd"> If BaseKeyValueStoreBackend is used as result backend, the mget method is used.</span> |
| <span class="sd"> If DatabaseBackend is used as result backend, the SELECT ...WHERE task_id IN (...) query is used</span> |
| <span class="sd"> Otherwise, multiprocessing.Pool will be used. Each task status will be downloaded individually.</span> |
| <span class="sd"> """</span> |
| |
| <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">sync_parralelism</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span> |
| <span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="fm">__init__</span><span class="p">()</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_sync_parallelism</span> <span class="o">=</span> <span class="n">sync_parralelism</span> |
| |
| <div class="viewcode-block" id="BulkStateFetcher.get_many"><a class="viewcode-back" href="../../../_api/airflow/executors/celery_executor/index.html#airflow.executors.celery_executor.BulkStateFetcher.get_many">[docs]</a> <span class="k">def</span> <span class="nf">get_many</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">async_results</span><span class="p">)</span> <span class="o">-></span> <span class="n">Mapping</span><span class="p">[</span><span class="nb">str</span><span class="p">,</span> <span class="n">EventBufferValueType</span><span class="p">]:</span> |
| <span class="sd">"""Gets status for many Celery tasks using the best method available."""</span> |
| <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">app</span><span class="o">.</span><span class="n">backend</span><span class="p">,</span> <span class="n">BaseKeyValueStoreBackend</span><span class="p">):</span> |
| <span class="n">result</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_get_many_from_kv_backend</span><span class="p">(</span><span class="n">async_results</span><span class="p">)</span> |
| <span class="k">return</span> <span class="n">result</span> |
| <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">app</span><span class="o">.</span><span class="n">backend</span><span class="p">,</span> <span class="n">DatabaseBackend</span><span class="p">):</span> |
| <span class="n">result</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_get_many_from_db_backend</span><span class="p">(</span><span class="n">async_results</span><span class="p">)</span> |
| <span class="k">return</span> <span class="n">result</span> |
| <span class="n">result</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_get_many_using_multiprocessing</span><span class="p">(</span><span class="n">async_results</span><span class="p">)</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">log</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s2">"Fetched </span><span class="si">%d</span><span class="s2"> states for </span><span class="si">%d</span><span class="s2"> task"</span><span class="p">,</span> <span class="nb">len</span><span class="p">(</span><span class="n">result</span><span class="p">),</span> <span class="nb">len</span><span class="p">(</span><span class="n">async_results</span><span class="p">))</span> |
| <span class="k">return</span> <span class="n">result</span></div> |
| |
| <div class="viewcode-block" id="BulkStateFetcher._get_many_from_kv_backend"><a class="viewcode-back" href="../../../_api/airflow/executors/celery_executor/index.html#airflow.executors.celery_executor.BulkStateFetcher._get_many_from_kv_backend">[docs]</a> <span class="k">def</span> <span class="nf">_get_many_from_kv_backend</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">async_tasks</span><span class="p">)</span> <span class="o">-></span> <span class="n">Mapping</span><span class="p">[</span><span class="nb">str</span><span class="p">,</span> <span class="n">EventBufferValueType</span><span class="p">]:</span> |
| <span class="n">task_ids</span> <span class="o">=</span> <span class="n">_tasks_list_to_task_ids</span><span class="p">(</span><span class="n">async_tasks</span><span class="p">)</span> |
| <span class="n">keys</span> <span class="o">=</span> <span class="p">[</span><span class="n">app</span><span class="o">.</span><span class="n">backend</span><span class="o">.</span><span class="n">get_key_for_task</span><span class="p">(</span><span class="n">k</span><span class="p">)</span> <span class="k">for</span> <span class="n">k</span> <span class="ow">in</span> <span class="n">task_ids</span><span class="p">]</span> |
| <span class="n">values</span> <span class="o">=</span> <span class="n">app</span><span class="o">.</span><span class="n">backend</span><span class="o">.</span><span class="n">mget</span><span class="p">(</span><span class="n">keys</span><span class="p">)</span> |
| <span class="n">task_results</span> <span class="o">=</span> <span class="p">[</span><span class="n">app</span><span class="o">.</span><span class="n">backend</span><span class="o">.</span><span class="n">decode_result</span><span class="p">(</span><span class="n">v</span><span class="p">)</span> <span class="k">for</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">values</span> <span class="k">if</span> <span class="n">v</span><span class="p">]</span> |
| <span class="n">task_results_by_task_id</span> <span class="o">=</span> <span class="p">{</span><span class="n">task_result</span><span class="p">[</span><span class="s2">"task_id"</span><span class="p">]:</span> <span class="n">task_result</span> <span class="k">for</span> <span class="n">task_result</span> <span class="ow">in</span> <span class="n">task_results</span><span class="p">}</span> |
| |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_prepare_state_and_info_by_task_dict</span><span class="p">(</span><span class="n">task_ids</span><span class="p">,</span> <span class="n">task_results_by_task_id</span><span class="p">)</span></div> |
| |
| <div class="viewcode-block" id="BulkStateFetcher._get_many_from_db_backend"><a class="viewcode-back" href="../../../_api/airflow/executors/celery_executor/index.html#airflow.executors.celery_executor.BulkStateFetcher._get_many_from_db_backend">[docs]</a> <span class="k">def</span> <span class="nf">_get_many_from_db_backend</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">async_tasks</span><span class="p">)</span> <span class="o">-></span> <span class="n">Mapping</span><span class="p">[</span><span class="nb">str</span><span class="p">,</span> <span class="n">EventBufferValueType</span><span class="p">]:</span> |
| <span class="n">task_ids</span> <span class="o">=</span> <span class="n">_tasks_list_to_task_ids</span><span class="p">(</span><span class="n">async_tasks</span><span class="p">)</span> |
| <span class="n">session</span> <span class="o">=</span> <span class="n">app</span><span class="o">.</span><span class="n">backend</span><span class="o">.</span><span class="n">ResultSession</span><span class="p">()</span> |
| <span class="n">task_cls</span> <span class="o">=</span> <span class="n">app</span><span class="o">.</span><span class="n">backend</span><span class="o">.</span><span class="n">task_cls</span> |
| <span class="k">with</span> <span class="n">session_cleanup</span><span class="p">(</span><span class="n">session</span><span class="p">):</span> |
| <span class="n">tasks</span> <span class="o">=</span> <span class="n">session</span><span class="o">.</span><span class="n">query</span><span class="p">(</span><span class="n">task_cls</span><span class="p">)</span><span class="o">.</span><span class="n">filter</span><span class="p">(</span><span class="n">task_cls</span><span class="o">.</span><span class="n">task_id</span><span class="o">.</span><span class="n">in_</span><span class="p">(</span><span class="n">task_ids</span><span class="p">))</span><span class="o">.</span><span class="n">all</span><span class="p">()</span> |
| |
| <span class="n">task_results</span> <span class="o">=</span> <span class="p">[</span><span class="n">app</span><span class="o">.</span><span class="n">backend</span><span class="o">.</span><span class="n">meta_from_decoded</span><span class="p">(</span><span class="n">task</span><span class="o">.</span><span class="n">to_dict</span><span class="p">())</span> <span class="k">for</span> <span class="n">task</span> <span class="ow">in</span> <span class="n">tasks</span><span class="p">]</span> |
| <span class="n">task_results_by_task_id</span> <span class="o">=</span> <span class="p">{</span><span class="n">task_result</span><span class="p">[</span><span class="s2">"task_id"</span><span class="p">]:</span> <span class="n">task_result</span> <span class="k">for</span> <span class="n">task_result</span> <span class="ow">in</span> <span class="n">task_results</span><span class="p">}</span> |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_prepare_state_and_info_by_task_dict</span><span class="p">(</span><span class="n">task_ids</span><span class="p">,</span> <span class="n">task_results_by_task_id</span><span class="p">)</span></div> |
| |
| <span class="nd">@staticmethod</span> |
| <div class="viewcode-block" id="BulkStateFetcher._prepare_state_and_info_by_task_dict"><a class="viewcode-back" href="../../../_api/airflow/executors/celery_executor/index.html#airflow.executors.celery_executor.BulkStateFetcher._prepare_state_and_info_by_task_dict">[docs]</a> <span class="k">def</span> <span class="nf">_prepare_state_and_info_by_task_dict</span><span class="p">(</span> |
| <span class="n">task_ids</span><span class="p">,</span> <span class="n">task_results_by_task_id</span> |
| <span class="p">)</span> <span class="o">-></span> <span class="n">Mapping</span><span class="p">[</span><span class="nb">str</span><span class="p">,</span> <span class="n">EventBufferValueType</span><span class="p">]:</span> |
| <span class="n">state_info</span><span class="p">:</span> <span class="n">MutableMapping</span><span class="p">[</span><span class="nb">str</span><span class="p">,</span> <span class="n">EventBufferValueType</span><span class="p">]</span> <span class="o">=</span> <span class="p">{}</span> |
| <span class="k">for</span> <span class="n">task_id</span> <span class="ow">in</span> <span class="n">task_ids</span><span class="p">:</span> |
| <span class="n">task_result</span> <span class="o">=</span> <span class="n">task_results_by_task_id</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">task_id</span><span class="p">)</span> |
| <span class="k">if</span> <span class="n">task_result</span><span class="p">:</span> |
| <span class="n">state</span> <span class="o">=</span> <span class="n">task_result</span><span class="p">[</span><span class="s2">"status"</span><span class="p">]</span> |
| <span class="n">info</span> <span class="o">=</span> <span class="kc">None</span> <span class="k">if</span> <span class="ow">not</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">task_result</span><span class="p">,</span> <span class="s2">"info"</span><span class="p">)</span> <span class="k">else</span> <span class="n">task_result</span><span class="p">[</span><span class="s2">"info"</span><span class="p">]</span> |
| <span class="k">else</span><span class="p">:</span> |
| <span class="n">state</span> <span class="o">=</span> <span class="n">celery_states</span><span class="o">.</span><span class="n">PENDING</span> |
| <span class="n">info</span> <span class="o">=</span> <span class="kc">None</span> |
| <span class="n">state_info</span><span class="p">[</span><span class="n">task_id</span><span class="p">]</span> <span class="o">=</span> <span class="n">state</span><span class="p">,</span> <span class="n">info</span> |
| <span class="k">return</span> <span class="n">state_info</span></div> |
| |
| <div class="viewcode-block" id="BulkStateFetcher._get_many_using_multiprocessing"><a class="viewcode-back" href="../../../_api/airflow/executors/celery_executor/index.html#airflow.executors.celery_executor.BulkStateFetcher._get_many_using_multiprocessing">[docs]</a> <span class="k">def</span> <span class="nf">_get_many_using_multiprocessing</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">async_results</span><span class="p">)</span> <span class="o">-></span> <span class="n">Mapping</span><span class="p">[</span><span class="nb">str</span><span class="p">,</span> <span class="n">EventBufferValueType</span><span class="p">]:</span> |
| <span class="n">num_process</span> <span class="o">=</span> <span class="nb">min</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="n">async_results</span><span class="p">),</span> <span class="bp">self</span><span class="o">.</span><span class="n">_sync_parallelism</span><span class="p">)</span> |
| |
| <span class="k">with</span> <span class="n">Pool</span><span class="p">(</span><span class="n">processes</span><span class="o">=</span><span class="n">num_process</span><span class="p">)</span> <span class="k">as</span> <span class="n">sync_pool</span><span class="p">:</span> |
| <span class="n">chunksize</span> <span class="o">=</span> <span class="nb">max</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="n">math</span><span class="o">.</span><span class="n">floor</span><span class="p">(</span><span class="n">math</span><span class="o">.</span><span class="n">ceil</span><span class="p">(</span><span class="mf">1.0</span> <span class="o">*</span> <span class="nb">len</span><span class="p">(</span><span class="n">async_results</span><span class="p">)</span> <span class="o">/</span> <span class="bp">self</span><span class="o">.</span><span class="n">_sync_parallelism</span><span class="p">)))</span> |
| |
| <span class="n">task_id_to_states_and_info</span> <span class="o">=</span> <span class="n">sync_pool</span><span class="o">.</span><span class="n">map</span><span class="p">(</span> |
| <span class="n">fetch_celery_task_state</span><span class="p">,</span> <span class="n">async_results</span><span class="p">,</span> <span class="n">chunksize</span><span class="o">=</span><span class="n">chunksize</span> |
| <span class="p">)</span> |
| |
| <span class="n">states_and_info_by_task_id</span><span class="p">:</span> <span class="n">MutableMapping</span><span class="p">[</span><span class="nb">str</span><span class="p">,</span> <span class="n">EventBufferValueType</span><span class="p">]</span> <span class="o">=</span> <span class="p">{}</span> |
| <span class="k">for</span> <span class="n">task_id</span><span class="p">,</span> <span class="n">state_or_exception</span><span class="p">,</span> <span class="n">info</span> <span class="ow">in</span> <span class="n">task_id_to_states_and_info</span><span class="p">:</span> |
| <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">state_or_exception</span><span class="p">,</span> <span class="n">ExceptionWithTraceback</span><span class="p">):</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">log</span><span class="o">.</span><span class="n">error</span><span class="p">(</span> <span class="c1"># pylint: disable=logging-not-lazy</span> |
| <span class="n">CELERY_FETCH_ERR_MSG_HEADER</span> <span class="o">+</span> <span class="s2">":</span><span class="si">%s</span><span class="se">\n</span><span class="si">%s</span><span class="se">\n</span><span class="s2">"</span><span class="p">,</span> |
| <span class="n">state_or_exception</span><span class="o">.</span><span class="n">exception</span><span class="p">,</span> |
| <span class="n">state_or_exception</span><span class="o">.</span><span class="n">traceback</span><span class="p">,</span> |
| <span class="p">)</span> |
| <span class="k">else</span><span class="p">:</span> |
| <span class="n">states_and_info_by_task_id</span><span class="p">[</span><span class="n">task_id</span><span class="p">]</span> <span class="o">=</span> <span class="n">state_or_exception</span><span class="p">,</span> <span class="n">info</span> |
| <span class="k">return</span> <span class="n">states_and_info_by_task_id</span></div></div> |
| </pre></div> |
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