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| <h5 class="page-header text-uppercase">Documentation |
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| </h5> |
| <h1 id="aurora-thermos-configuration-reference">Aurora + Thermos Configuration Reference</h1> |
| |
| <ul> |
| <li><a href="#aurora--thermos-configuration-reference">Aurora + Thermos Configuration Reference</a></li> |
| <li><a href="#introduction">Introduction</a></li> |
| <li><a href="#process-schema">Process Schema</a> |
| |
| <ul> |
| <li><a href="#process-objects">Process Objects</a> |
| |
| <ul> |
| <li><a href="#name">name</a></li> |
| <li><a href="#cmdline">cmdline</a></li> |
| <li><a href="#max_failures">max_failures</a></li> |
| <li><a href="#daemon">daemon</a></li> |
| <li><a href="#ephemeral">ephemeral</a></li> |
| <li><a href="#min_duration">min_duration</a></li> |
| <li><a href="#final">final</a></li> |
| <li><a href="#logger">logger</a></li> |
| </ul></li> |
| </ul></li> |
| <li><a href="#task-schema">Task Schema</a> |
| |
| <ul> |
| <li><a href="#task-object">Task Object</a> |
| |
| <ul> |
| <li><a href="#name-1">name</a></li> |
| <li><a href="#processes">processes</a></li> |
| <li><a href="#constraints">constraints</a></li> |
| <li><a href="#resources">resources</a></li> |
| <li><a href="#max_failures-1">max_failures</a></li> |
| <li><a href="#max_concurrency">max_concurrency</a></li> |
| <li><a href="#finalization_wait">finalization_wait</a></li> |
| </ul></li> |
| <li><a href="#constraint-object">Constraint Object</a></li> |
| <li><a href="#resource-object">Resource Object</a></li> |
| </ul></li> |
| <li><a href="#job-schema">Job Schema</a> |
| |
| <ul> |
| <li><a href="#job-objects">Job Objects</a></li> |
| <li><a href="#services">Services</a></li> |
| <li><a href="#revocable-jobs">Revocable Jobs</a></li> |
| <li><a href="#updateconfig-objects">UpdateConfig Objects</a></li> |
| <li><a href="#healthcheckconfig-objects">HealthCheckConfig Objects</a></li> |
| <li><a href="#announcer-objects">Announcer Objects</a></li> |
| <li><a href="#container">Container Objects</a></li> |
| <li><a href="#lifecycleconfig-objects">LifecycleConfig Objects</a></li> |
| </ul></li> |
| <li><a href="#specifying-scheduling-constraints">Specifying Scheduling Constraints</a></li> |
| <li><a href="#template-namespaces">Template Namespaces</a> |
| |
| <ul> |
| <li><a href="#mesos-namespace">mesos Namespace</a></li> |
| <li><a href="#thermos-namespace">thermos Namespace</a></li> |
| </ul></li> |
| <li><a href="#basic-examples">Basic Examples</a> |
| |
| <ul> |
| <li><a href="#hello_worldaurora">hello_world.aurora</a></li> |
| <li><a href="#environment-tailoring">Environment Tailoring</a> |
| |
| <ul> |
| <li><a href="#hello_world_productionizedaurora">hello<em>world</em>productionized.aurora</a></li> |
| </ul></li> |
| </ul></li> |
| </ul> |
| |
| <h1 id="introduction">Introduction</h1> |
| |
| <p>Don’t know where to start? The Aurora configuration schema is very |
| powerful, and configurations can become quite complex for advanced use |
| cases.</p> |
| |
| <p>For examples of simple configurations to get something up and running |
| quickly, check out the <a href="/documentation/0.11.0/tutorial/">Tutorial</a>. When you feel comfortable with the basics, move |
| on to the <a href="/documentation/0.11.0/configuration-tutorial/">Configuration Tutorial</a> for more in-depth coverage of |
| configuration design.</p> |
| |
| <p>For additional basic configuration examples, see <a href="#BasicExamples">the end of this document</a>.</p> |
| |
| <h1 id="process-schema">Process Schema</h1> |
| |
| <p>Process objects consist of required <code>name</code> and <code>cmdline</code> attributes. You can customize Process |
| behavior with its optional attributes. Remember, Processes are handled by Thermos.</p> |
| |
| <h3 id="process-objects">Process Objects</h3> |
| |
| <table><thead> |
| <tr> |
| <th><strong>Attribute Name</strong></th> |
| <th style="text-align: center"><strong>Type</strong></th> |
| <th><strong>Description</strong></th> |
| </tr> |
| </thead><tbody> |
| <tr> |
| <td><strong>name</strong></td> |
| <td style="text-align: center">String</td> |
| <td>Process name (Required)</td> |
| </tr> |
| <tr> |
| <td><strong>cmdline</strong></td> |
| <td style="text-align: center">String</td> |
| <td>Command line (Required)</td> |
| </tr> |
| <tr> |
| <td><strong>max_failures</strong></td> |
| <td style="text-align: center">Integer</td> |
| <td>Maximum process failures (Default: 1)</td> |
| </tr> |
| <tr> |
| <td><strong>daemon</strong></td> |
| <td style="text-align: center">Boolean</td> |
| <td>When True, this is a daemon process. (Default: False)</td> |
| </tr> |
| <tr> |
| <td><strong>ephemeral</strong></td> |
| <td style="text-align: center">Boolean</td> |
| <td>When True, this is an ephemeral process. (Default: False)</td> |
| </tr> |
| <tr> |
| <td><strong>min_duration</strong></td> |
| <td style="text-align: center">Integer</td> |
| <td>Minimum duration between process restarts in seconds. (Default: 15)</td> |
| </tr> |
| <tr> |
| <td><strong>final</strong></td> |
| <td style="text-align: center">Boolean</td> |
| <td>When True, this process is a finalizing one that should run last. (Default: False)</td> |
| </tr> |
| <tr> |
| <td><strong>logger</strong></td> |
| <td style="text-align: center">Logger</td> |
| <td>Struct defining the log behavior for the process. (Default: Empty)</td> |
| </tr> |
| </tbody></table> |
| |
| <h4 id="name">name</h4> |
| |
| <p>The name is any valid UNIX filename string (specifically no |
| slashes, NULLs or leading periods). Within a Task object, each Process name |
| must be unique.</p> |
| |
| <h4 id="cmdline">cmdline</h4> |
| |
| <p>The command line run by the process. The command line is invoked in a bash |
| subshell, so can involve fully-blown bash scripts. However, nothing is |
| supplied for command-line arguments so <code>$*</code> is unspecified.</p> |
| |
| <h4 id="max_failures">max_failures</h4> |
| |
| <p>The maximum number of failures (non-zero exit statuses) this process can |
| have before being marked permanently failed and not retried. If a |
| process permanently fails, Thermos looks at the failure limit of the task |
| containing the process (usually 1) to determine if the task has |
| failed as well.</p> |
| |
| <p>Setting <code>max_failures</code> to 0 makes the process retry |
| indefinitely until it achieves a successful (zero) exit status. |
| It retries at most once every <code>min_duration</code> seconds to prevent |
| an effective denial of service attack on the coordinating Thermos scheduler.</p> |
| |
| <h4 id="daemon">daemon</h4> |
| |
| <p>By default, Thermos processes are non-daemon. If <code>daemon</code> is set to True, a |
| successful (zero) exit status does not prevent future process runs. |
| Instead, the process reinvokes after <code>min_duration</code> seconds. |
| However, the maximum failure limit still applies. A combination of |
| <code>daemon=True</code> and <code>max_failures=0</code> causes a process to retry |
| indefinitely regardless of exit status. This should be avoided |
| for very short-lived processes because of the accumulation of |
| checkpointed state for each process run. When running in Mesos |
| specifically, <code>max_failures</code> is capped at 100.</p> |
| |
| <h4 id="ephemeral">ephemeral</h4> |
| |
| <p>By default, Thermos processes are non-ephemeral. If <code>ephemeral</code> is set to |
| True, the process’ status is not used to determine if its containing task |
| has completed. For example, consider a task with a non-ephemeral |
| webserver process and an ephemeral logsaver process |
| that periodically checkpoints its log files to a centralized data store. |
| The task is considered finished once the webserver process has |
| completed, regardless of the logsaver’s current status.</p> |
| |
| <h4 id="min_duration">min_duration</h4> |
| |
| <p>Processes may succeed or fail multiple times during a single task’s |
| duration. Each of these is called a <em>process run</em>. <code>min_duration</code> is |
| the minimum number of seconds the scheduler waits before running the |
| same process.</p> |
| |
| <h4 id="final">final</h4> |
| |
| <p>Processes can be grouped into two classes: ordinary processes and |
| finalizing processes. By default, Thermos processes are ordinary. They |
| run as long as the task is considered healthy (i.e., no failure |
| limits have been reached.) But once all regular Thermos processes |
| finish or the task reaches a certain failure threshold, it |
| moves into a “finalization” stage and runs all finalizing |
| processes. These are typically processes necessary for cleaning up the |
| task, such as log checkpointers, or perhaps e-mail notifications that |
| the task completed.</p> |
| |
| <p>Finalizing processes may not depend upon ordinary processes or |
| vice-versa, however finalizing processes may depend upon other |
| finalizing processes and otherwise run as a typical process |
| schedule.</p> |
| |
| <h4 id="logger">logger</h4> |
| |
| <p>The default behavior of Thermos is to allow stderr/stdout logs to grow unbounded. In the event |
| that you have large log volume, you may want to configure Thermos to automatically rotate logs |
| after they grow to a certain size, which can prevent your job from using more than its allocated |
| disk space.</p> |
| |
| <p>A Logger union consists of a mode enum and a rotation policy. Rotation policies only apply to |
| loggers whose mode is <code>rotate</code>. The acceptable values for the LoggerMode enum are <code>standard</code> |
| and <code>rotate</code>. The rotation policy applies to both stderr and stdout.</p> |
| |
| <p>By default, all processes use the <code>standard</code> LoggerMode.</p> |
| |
| <table><thead> |
| <tr> |
| <th><strong>Attribute Name</strong></th> |
| <th style="text-align: center"><strong>Type</strong></th> |
| <th><strong>Description</strong></th> |
| </tr> |
| </thead><tbody> |
| <tr> |
| <td><strong>mode</strong></td> |
| <td style="text-align: center">LoggerMode</td> |
| <td>Mode of the logger. (Required)</td> |
| </tr> |
| <tr> |
| <td><strong>rotate</strong></td> |
| <td style="text-align: center">RotatePolicy</td> |
| <td>An optional rotation policy.</td> |
| </tr> |
| </tbody></table> |
| |
| <p>A RotatePolicy describes log rotation behavior for when <code>mode</code> is set to <code>rotate</code>. It is ignored |
| otherwise.</p> |
| |
| <table><thead> |
| <tr> |
| <th><strong>Attribute Name</strong></th> |
| <th style="text-align: center"><strong>Type</strong></th> |
| <th><strong>Description</strong></th> |
| </tr> |
| </thead><tbody> |
| <tr> |
| <td><strong>log_size</strong></td> |
| <td style="text-align: center">Integer</td> |
| <td>Maximum size (in bytes) of an individual log file. (Default: 100 MiB)</td> |
| </tr> |
| <tr> |
| <td><strong>backups</strong></td> |
| <td style="text-align: center">Integer</td> |
| <td>The maximum number of backups to retain. (Default: 5)</td> |
| </tr> |
| </tbody></table> |
| |
| <p>An example process configuration is as follows:</p> |
| <pre class="highlight plaintext"><code> process = Process( |
| name='process', |
| logger=Logger( |
| mode=LoggerMode('rotate'), |
| rotate=RotatePolicy(log_size=5*MB, backups=5) |
| ) |
| ) |
| </code></pre> |
| |
| <h1 id="task-schema">Task Schema</h1> |
| |
| <p>Tasks fundamentally consist of a <code>name</code> and a list of Process objects stored as the |
| value of the <code>processes</code> attribute. Processes can be further constrained with |
| <code>constraints</code>. By default, <code>name</code>’s value inherits from the first Process in the |
| <code>processes</code> list, so for simple <code>Task</code> objects with one Process, <code>name</code> |
| can be omitted. In Mesos, <code>resources</code> is also required.</p> |
| |
| <h3 id="task-object">Task Object</h3> |
| |
| <table><thead> |
| <tr> |
| <th><strong>param</strong></th> |
| <th style="text-align: center"><strong>type</strong></th> |
| <th><strong>description</strong></th> |
| </tr> |
| </thead><tbody> |
| <tr> |
| <td><code>name</code></td> |
| <td style="text-align: center">String</td> |
| <td>Process name (Required) (Default: <code>processes0.name</code>)</td> |
| </tr> |
| <tr> |
| <td><code>processes</code></td> |
| <td style="text-align: center">List of <code>Process</code> objects</td> |
| <td>List of <code>Process</code> objects bound to this task. (Required)</td> |
| </tr> |
| <tr> |
| <td><code>constraints</code></td> |
| <td style="text-align: center">List of <code>Constraint</code> objects</td> |
| <td>List of <code>Constraint</code> objects constraining processes.</td> |
| </tr> |
| <tr> |
| <td><code>resources</code></td> |
| <td style="text-align: center"><code>Resource</code> object</td> |
| <td>Resource footprint. (Required)</td> |
| </tr> |
| <tr> |
| <td><code>max_failures</code></td> |
| <td style="text-align: center">Integer</td> |
| <td>Maximum process failures before being considered failed (Default: 1)</td> |
| </tr> |
| <tr> |
| <td><code>max_concurrency</code></td> |
| <td style="text-align: center">Integer</td> |
| <td>Maximum number of concurrent processes (Default: 0, unlimited concurrency.)</td> |
| </tr> |
| <tr> |
| <td><code>finalization_wait</code></td> |
| <td style="text-align: center">Integer</td> |
| <td>Amount of time allocated for finalizing processes, in seconds. (Default: 30)</td> |
| </tr> |
| </tbody></table> |
| |
| <h4 id="name">name</h4> |
| |
| <p><code>name</code> is a string denoting the name of this task. It defaults to the name of the first Process in |
| the list of Processes associated with the <code>processes</code> attribute.</p> |
| |
| <h4 id="processes">processes</h4> |
| |
| <p><code>processes</code> is an unordered list of <code>Process</code> objects. To constrain the order |
| in which they run, use <code>constraints</code>.</p> |
| |
| <h5 id="constraints">constraints</h5> |
| |
| <p>A list of <code>Constraint</code> objects. Currently it supports only one type, |
| the <code>order</code> constraint. <code>order</code> is a list of process names |
| that should run in the order given. For example,</p> |
| <pre class="highlight plaintext"><code> process = Process(cmdline = "echo hello {{name}}") |
| task = Task(name = "echoes", |
| processes = [process(name = "jim"), process(name = "bob")], |
| constraints = [Constraint(order = ["jim", "bob"])) |
| </code></pre> |
| |
| <p>Constraints can be supplied ad-hoc and in duplicate. Not all |
| Processes need be constrained, however Tasks with cycles are |
| rejected by the Thermos scheduler.</p> |
| |
| <p>Use the <code>order</code> function as shorthand to generate <code>Constraint</code> lists. |
| The following:</p> |
| <pre class="highlight plaintext"><code> order(process1, process2) |
| </code></pre> |
| |
| <p>is shorthand for</p> |
| <pre class="highlight plaintext"><code> [Constraint(order = [process1.name(), process2.name()])] |
| </code></pre> |
| |
| <p>The <code>order</code> function accepts Process name strings <code>('foo', 'bar')</code> or the processes |
| themselves, e.g. <code>foo=Process(name='foo', ...)</code>, <code>bar=Process(name='bar', ...)</code>, |
| <code>constraints=order(foo, bar)</code>.</p> |
| |
| <h4 id="resources">resources</h4> |
| |
| <p>Takes a <code>Resource</code> object, which specifies the amounts of CPU, memory, and disk space resources |
| to allocate to the Task.</p> |
| |
| <h4 id="max_failures">max_failures</h4> |
| |
| <p><code>max_failures</code> is the number of failed processes needed for the <code>Task</code> to be |
| marked as failed.</p> |
| |
| <p>For example, assume a Task has two Processes and a <code>max_failures</code> value of <code>2</code>:</p> |
| <pre class="highlight plaintext"><code> template = Process(max_failures=10) |
| task = Task( |
| name = "fail", |
| processes = [ |
| template(name = "failing", cmdline = "exit 1"), |
| template(name = "succeeding", cmdline = "exit 0") |
| ], |
| max_failures=2) |
| </code></pre> |
| |
| <p>The <code>failing</code> Process could fail 10 times before being marked as permanently |
| failed, and the <code>succeeding</code> Process could succeed on the first run. However, |
| the task would succeed despite only allowing for two failed processes. To be more |
| specific, there would be 10 failed process runs yet 1 failed process. Both processes |
| would have to fail for the Task to fail.</p> |
| |
| <h4 id="max_concurrency">max_concurrency</h4> |
| |
| <p>For Tasks with a number of expensive but otherwise independent |
| processes, you may want to limit the amount of concurrency |
| the Thermos scheduler provides rather than artificially constraining |
| it via <code>order</code> constraints. For example, a test framework may |
| generate a task with 100 test run processes, but wants to run it on |
| a machine with only 4 cores. You can limit the amount of parallelism to |
| 4 by setting <code>max_concurrency=4</code> in your task configuration.</p> |
| |
| <p>For example, the following task spawns 180 Processes (“mappers”) |
| to compute individual elements of a 180 degree sine table, all dependent |
| upon one final Process (“reducer”) to tabulate the results:</p> |
| <pre class="highlight plaintext"><code>def make_mapper(id): |
| return Process( |
| name = "mapper%03d" % id, |
| cmdline = "echo 'scale=50;s(%d\*4\*a(1)/180)' | bc -l > |
| temp.sine_table.%03d" % (id, id)) |
| |
| def make_reducer(): |
| return Process(name = "reducer", cmdline = "cat temp.\* | nl \> sine\_table.txt |
| && rm -f temp.\*") |
| |
| processes = map(make_mapper, range(180)) |
| |
| task = Task( |
| name = "mapreduce", |
| processes = processes + [make\_reducer()], |
| constraints = [Constraint(order = [mapper.name(), 'reducer']) for mapper |
| in processes], |
| max_concurrency = 8) |
| </code></pre> |
| |
| <h4 id="finalization_wait">finalization_wait</h4> |
| |
| <p>Tasks have three active stages: <code>ACTIVE</code>, <code>CLEANING</code>, and <code>FINALIZING</code>. The |
| <code>ACTIVE</code> stage is when ordinary processes run. This stage lasts as |
| long as Processes are running and the Task is healthy. The moment either |
| all Processes have finished successfully or the Task has reached a |
| maximum Process failure limit, it goes into <code>CLEANING</code> stage and send |
| SIGTERMs to all currently running Processes and their process trees. |
| Once all Processes have terminated, the Task goes into <code>FINALIZING</code> stage |
| and invokes the schedule of all Processes with the “final” attribute set to True.</p> |
| |
| <p>This whole process from the end of <code>ACTIVE</code> stage to the end of <code>FINALIZING</code> |
| must happen within <code>finalization_wait</code> seconds. If it does not |
| finish during that time, all remaining Processes are sent SIGKILLs |
| (or if they depend upon uncompleted Processes, are |
| never invoked.)</p> |
| |
| <p>Client applications with higher priority may force a shorter |
| finalization wait (e.g. through parameters to <code>thermos kill</code>), so this |
| is mostly a best-effort signal.</p> |
| |
| <h3 id="constraint-object">Constraint Object</h3> |
| |
| <p>Current constraint objects only support a single ordering constraint, <code>order</code>, |
| which specifies its processes run sequentially in the order given. By |
| default, all processes run in parallel when bound to a <code>Task</code> without |
| ordering constraints.</p> |
| |
| <table><thead> |
| <tr> |
| <th>param</th> |
| <th style="text-align: center">type</th> |
| <th>description</th> |
| </tr> |
| </thead><tbody> |
| <tr> |
| <td>order</td> |
| <td style="text-align: center">List of String</td> |
| <td>List of processes by name (String) that should be run serially.</td> |
| </tr> |
| </tbody></table> |
| |
| <h3 id="resource-object">Resource Object</h3> |
| |
| <p>Specifies the amount of CPU, Ram, and disk resources the task needs. See the |
| <a href="/documentation/0.11.0/resources/">Resource Isolation document</a> for suggested values and to understand how |
| resources are allocated.</p> |
| |
| <table><thead> |
| <tr> |
| <th>param</th> |
| <th style="text-align: center">type</th> |
| <th>description</th> |
| </tr> |
| </thead><tbody> |
| <tr> |
| <td><code>cpu</code></td> |
| <td style="text-align: center">Float</td> |
| <td>Fractional number of cores required by the task.</td> |
| </tr> |
| <tr> |
| <td><code>ram</code></td> |
| <td style="text-align: center">Integer</td> |
| <td>Bytes of RAM required by the task.</td> |
| </tr> |
| <tr> |
| <td><code>disk</code></td> |
| <td style="text-align: center">Integer</td> |
| <td>Bytes of disk required by the task.</td> |
| </tr> |
| </tbody></table> |
| |
| <h1 id="job-schema">Job Schema</h1> |
| |
| <h3 id="job-objects">Job Objects</h3> |
| |
| <table><thead> |
| <tr> |
| <th>name</th> |
| <th style="text-align: center">type</th> |
| <th>description</th> |
| </tr> |
| </thead><tbody> |
| <tr> |
| <td><code>task</code></td> |
| <td style="text-align: center">Task</td> |
| <td>The Task object to bind to this job. Required.</td> |
| </tr> |
| <tr> |
| <td><code>name</code></td> |
| <td style="text-align: center">String</td> |
| <td>Job name. (Default: inherited from the task attribute’s name)</td> |
| </tr> |
| <tr> |
| <td><code>role</code></td> |
| <td style="text-align: center">String</td> |
| <td>Job role account. Required.</td> |
| </tr> |
| <tr> |
| <td><code>cluster</code></td> |
| <td style="text-align: center">String</td> |
| <td>Cluster in which this job is scheduled. Required.</td> |
| </tr> |
| <tr> |
| <td><code>environment</code></td> |
| <td style="text-align: center">String</td> |
| <td>Job environment, default <code>devel</code>. Must be one of <code>prod</code>, <code>devel</code>, <code>test</code> or <code>staging<number></code>.</td> |
| </tr> |
| <tr> |
| <td><code>contact</code></td> |
| <td style="text-align: center">String</td> |
| <td>Best email address to reach the owner of the job. For production jobs, this is usually a team mailing list.</td> |
| </tr> |
| <tr> |
| <td><code>instances</code></td> |
| <td style="text-align: center">Integer</td> |
| <td>Number of instances (sometimes referred to as replicas or shards) of the task to create. (Default: 1)</td> |
| </tr> |
| <tr> |
| <td><code>cron_schedule</code></td> |
| <td style="text-align: center">String</td> |
| <td>Cron schedule in cron format. May only be used with non-service jobs. See <a href="/documentation/0.11.0/cron-jobs/">Cron Jobs</a> for more information. Default: None (not a cron job.)</td> |
| </tr> |
| <tr> |
| <td><code>cron_collision_policy</code></td> |
| <td style="text-align: center">String</td> |
| <td>Policy to use when a cron job is triggered while a previous run is still active. KILL<em>EXISTING Kill the previous run, and schedule the new run CANCEL</em>NEW Let the previous run continue, and cancel the new run. (Default: KILL_EXISTING)</td> |
| </tr> |
| <tr> |
| <td><code>update_config</code></td> |
| <td style="text-align: center"><code>UpdateConfig</code> object</td> |
| <td>Parameters for controlling the rate and policy of rolling updates.</td> |
| </tr> |
| <tr> |
| <td><code>constraints</code></td> |
| <td style="text-align: center">dict</td> |
| <td>Scheduling constraints for the tasks. See the section on the <a href="#Specifying-Scheduling-Constraints">constraint specification language</a></td> |
| </tr> |
| <tr> |
| <td><code>service</code></td> |
| <td style="text-align: center">Boolean</td> |
| <td>If True, restart tasks regardless of success or failure. (Default: False)</td> |
| </tr> |
| <tr> |
| <td><code>max_task_failures</code></td> |
| <td style="text-align: center">Integer</td> |
| <td>Maximum number of failures after which the task is considered to have failed (Default: 1) Set to -1 to allow for infinite failures</td> |
| </tr> |
| <tr> |
| <td><code>priority</code></td> |
| <td style="text-align: center">Integer</td> |
| <td>Preemption priority to give the task (Default 0). Tasks with higher priorities may preempt tasks at lower priorities.</td> |
| </tr> |
| <tr> |
| <td><code>production</code></td> |
| <td style="text-align: center">Boolean</td> |
| <td>Whether or not this is a production task that may <a href="/documentation/0.11.0/resources/#task-preemption">preempt</a> other tasks (Default: False). Production job role must have the appropriate <a href="/documentation/0.11.0/resources/#resource-quota">quota</a>.</td> |
| </tr> |
| <tr> |
| <td><code>health_check_config</code></td> |
| <td style="text-align: center"><code>HealthCheckConfig</code> object</td> |
| <td>Parameters for controlling a task’s health checks. HTTP health check is only used if a health port was assigned with a command line wildcard.</td> |
| </tr> |
| <tr> |
| <td><code>container</code></td> |
| <td style="text-align: center"><code>Container</code> object</td> |
| <td>An optional container to run all processes inside of.</td> |
| </tr> |
| <tr> |
| <td><code>lifecycle</code></td> |
| <td style="text-align: center"><code>LifecycleConfig</code> object</td> |
| <td>An optional task lifecycle configuration that dictates commands to be executed on startup/teardown. HTTP lifecycle is enabled by default if the “health” port is requested. See <a href="#lifecycleconfig-objects">LifecycleConfig Objects</a> for more information.</td> |
| </tr> |
| <tr> |
| <td><code>tier</code></td> |
| <td style="text-align: center">String</td> |
| <td>Task tier type. When set to <code>revocable</code> requires the task to run with Mesos revocable resources. This is work <a href="https://issues.apache.org/jira/browse/AURORA-1343">in progress</a> and is currently only supported for the revocable tasks. The ultimate goal is to simplify task configuration by hiding various configuration knobs behind a task tier definition. See AURORA-1343 and AURORA-1443 for more details.</td> |
| </tr> |
| </tbody></table> |
| |
| <h3 id="services">Services</h3> |
| |
| <p>Jobs with the <code>service</code> flag set to True are called Services. The <code>Service</code> |
| alias can be used as shorthand for <code>Job</code> with <code>service=True</code>. |
| Services are differentiated from non-service Jobs in that tasks |
| always restart on completion, whether successful or unsuccessful. |
| Jobs without the service bit set only restart up to |
| <code>max_task_failures</code> times and only if they terminated unsuccessfully |
| either due to human error or machine failure.</p> |
| |
| <h3 id="revocable-jobs">Revocable Jobs</h3> |
| |
| <p><strong>WARNING</strong>: This feature is currently in alpha status. Do not use it in production clusters!</p> |
| |
| <p>Mesos <a href="http://mesos.apache.org/documentation/latest/oversubscription/">supports a concept of revocable tasks</a> |
| by oversubscribing machine resources by the amount deemed safe to not affect the existing |
| non-revocable tasks. Aurora now supports revocable jobs via a <code>tier</code> setting set to <code>revocable</code> |
| value.</p> |
| |
| <p>More implementation details in this <a href="https://issues.apache.org/jira/browse/AURORA-1343">ticket</a>.</p> |
| |
| <p>Scheduler must be <a href="/documentation/0.11.0/deploying-aurora-scheduler/#configuring-resource-oversubscription">configured</a> |
| to receive revocable offers from Mesos and accept revocable jobs. If not configured properly |
| revocable tasks will never get assigned to hosts and will stay in PENDING.</p> |
| |
| <h3 id="updateconfig-objects">UpdateConfig Objects</h3> |
| |
| <p>Parameters for controlling the rate and policy of rolling updates.</p> |
| |
| <table><thead> |
| <tr> |
| <th>object</th> |
| <th style="text-align: center">type</th> |
| <th>description</th> |
| </tr> |
| </thead><tbody> |
| <tr> |
| <td><code>batch_size</code></td> |
| <td style="text-align: center">Integer</td> |
| <td>Maximum number of shards to be updated in one iteration (Default: 1)</td> |
| </tr> |
| <tr> |
| <td><code>restart_threshold</code></td> |
| <td style="text-align: center">Integer</td> |
| <td>Maximum number of seconds before a shard must move into the <code>RUNNING</code> state before considered a failure (Default: 60)</td> |
| </tr> |
| <tr> |
| <td><code>watch_secs</code></td> |
| <td style="text-align: center">Integer</td> |
| <td>Minimum number of seconds a shard must remain in <code>RUNNING</code> state before considered a success (Default: 45)</td> |
| </tr> |
| <tr> |
| <td><code>max_per_shard_failures</code></td> |
| <td style="text-align: center">Integer</td> |
| <td>Maximum number of restarts per shard during update. Increments total failure count when this limit is exceeded. (Default: 0)</td> |
| </tr> |
| <tr> |
| <td><code>max_total_failures</code></td> |
| <td style="text-align: center">Integer</td> |
| <td>Maximum number of shard failures to be tolerated in total during an update. Cannot be greater than or equal to the total number of tasks in a job. (Default: 0)</td> |
| </tr> |
| <tr> |
| <td><code>rollback_on_failure</code></td> |
| <td style="text-align: center">boolean</td> |
| <td>When False, prevents auto rollback of a failed update (Default: True)</td> |
| </tr> |
| <tr> |
| <td><code>wait_for_batch_completion</code></td> |
| <td style="text-align: center">boolean</td> |
| <td>When True, all threads from a given batch will be blocked from picking up new instances until the entire batch is updated. This essentially simulates the legacy sequential updater algorithm. (Default: False)</td> |
| </tr> |
| <tr> |
| <td><code>pulse_interval_secs</code></td> |
| <td style="text-align: center">Integer</td> |
| <td>Indicates a <a href="/documentation/0.11.0/client-commands/#coordinated-job-updates">coordinated update</a>. If no pulses are received within the provided interval the update will be blocked. Beta-updater only. Will fail on submission when used with client updater. (Default: None)</td> |
| </tr> |
| </tbody></table> |
| |
| <h3 id="healthcheckconfig-objects">HealthCheckConfig Objects</h3> |
| |
| <p><em>Note: <code>endpoint</code>, <code>expected_response</code> and <code>expected_response_code</code> are deprecated from <code>HealthCheckConfig</code> and must be definied in <code>HttpHealthChecker</code>.</em></p> |
| |
| <p>Parameters for controlling a task’s health checks via HTTP or a shell command.</p> |
| |
| <table><thead> |
| <tr> |
| <th>param</th> |
| <th style="text-align: center">type</th> |
| <th>description</th> |
| </tr> |
| </thead><tbody> |
| <tr> |
| <td><em><code>endpoint</code></em></td> |
| <td style="text-align: center">String</td> |
| <td>HTTP endpoint to check (Default: /health) <strong>Deprecated.</strong></td> |
| </tr> |
| <tr> |
| <td><em><code>expected_response</code></em></td> |
| <td style="text-align: center">String</td> |
| <td>If not empty, fail the HTTP health check if the response differs. Case insensitive. (Default: ok) <strong>Deprecated.</strong></td> |
| </tr> |
| <tr> |
| <td><em><code>expected_response_code</code></em></td> |
| <td style="text-align: center">Integer</td> |
| <td>If not zero, fail the HTTP health check if the response code differs. (Default: 0) <strong>Deprecated.</strong></td> |
| </tr> |
| <tr> |
| <td><code>health_checker</code></td> |
| <td style="text-align: center">HealthCheckerConfig</td> |
| <td>Configure what kind of health check to use.</td> |
| </tr> |
| <tr> |
| <td><code>initial_interval_secs</code></td> |
| <td style="text-align: center">Integer</td> |
| <td>Initial delay for performing a health check. (Default: 15)</td> |
| </tr> |
| <tr> |
| <td><code>interval_secs</code></td> |
| <td style="text-align: center">Integer</td> |
| <td>Interval on which to check the task’s health. (Default: 10)</td> |
| </tr> |
| <tr> |
| <td><code>max_consecutive_failures</code></td> |
| <td style="text-align: center">Integer</td> |
| <td>Maximum number of consecutive failures that will be tolerated before considering a task unhealthy (Default: 0)</td> |
| </tr> |
| <tr> |
| <td><code>timeout_secs</code></td> |
| <td style="text-align: center">Integer</td> |
| <td>Health check timeout. (Default: 1)</td> |
| </tr> |
| </tbody></table> |
| |
| <h3 id="healthcheckerconfig-objects">HealthCheckerConfig Objects</h3> |
| |
| <table><thead> |
| <tr> |
| <th>param</th> |
| <th style="text-align: center">type</th> |
| <th>description</th> |
| </tr> |
| </thead><tbody> |
| <tr> |
| <td><code>http</code></td> |
| <td style="text-align: center">HttpHealthChecker</td> |
| <td>Configure health check to use HTTP. (Default)</td> |
| </tr> |
| <tr> |
| <td><code>shell</code></td> |
| <td style="text-align: center">ShellHealthChecker</td> |
| <td>Configure health check via a shell command.</td> |
| </tr> |
| </tbody></table> |
| |
| <h3 id="httphealthchecker-objects">HttpHealthChecker Objects</h3> |
| |
| <table><thead> |
| <tr> |
| <th>param</th> |
| <th style="text-align: center">type</th> |
| <th>description</th> |
| </tr> |
| </thead><tbody> |
| <tr> |
| <td><code>endpoint</code></td> |
| <td style="text-align: center">String</td> |
| <td>HTTP endpoint to check (Default: /health)</td> |
| </tr> |
| <tr> |
| <td><code>expected_response</code></td> |
| <td style="text-align: center">String</td> |
| <td>If not empty, fail the HTTP health check if the response differs. Case insensitive. (Default: ok)</td> |
| </tr> |
| <tr> |
| <td><code>expected_response_code</code></td> |
| <td style="text-align: center">Integer</td> |
| <td>If not zero, fail the HTTP health check if the response code differs. (Default: 0)</td> |
| </tr> |
| </tbody></table> |
| |
| <h3 id="shellhealthchecker-objects">ShellHealthChecker Objects</h3> |
| |
| <table><thead> |
| <tr> |
| <th>param</th> |
| <th style="text-align: center">type</th> |
| <th>description</th> |
| </tr> |
| </thead><tbody> |
| <tr> |
| <td><code>shell_command</code></td> |
| <td style="text-align: center">String</td> |
| <td>An alternative to HTTP health checking. Specifies a shell command that will be executed. Any non-zero exit status will be interpreted as a health check failure.</td> |
| </tr> |
| </tbody></table> |
| |
| <h3 id="announcer-objects">Announcer Objects</h3> |
| |
| <p>If the <code>announce</code> field in the Job configuration is set, each task will be |
| registered in the ServerSet <code>/aurora/role/environment/jobname</code> in the |
| zookeeper ensemble configured by the executor. If no Announcer object is specified, |
| no announcement will take place. For more information about ServerSets, see the <a href="/documentation/0.11.0/user-guide/">User Guide</a>.</p> |
| |
| <table><thead> |
| <tr> |
| <th>object</th> |
| <th style="text-align: center">type</th> |
| <th>description</th> |
| </tr> |
| </thead><tbody> |
| <tr> |
| <td><code>primary_port</code></td> |
| <td style="text-align: center">String</td> |
| <td>Which named port to register as the primary endpoint in the ServerSet (Default: <code>http</code>)</td> |
| </tr> |
| <tr> |
| <td><code>portmap</code></td> |
| <td style="text-align: center">dict</td> |
| <td>A mapping of additional endpoints to announced in the ServerSet (Default: <code>{ 'aurora': '{{primary_port}}' }</code>)</td> |
| </tr> |
| </tbody></table> |
| |
| <h3 id="port-aliasing-with-the-announcer-portmap">Port aliasing with the Announcer <code>portmap</code></h3> |
| |
| <p>The primary endpoint registered in the ServerSet is the one allocated to the port |
| specified by the <code>primary_port</code> in the <code>Announcer</code> object, by default |
| the <code>http</code> port. This port can be referenced from anywhere within a configuration |
| as <code>{{thermos.ports[http]}}</code>.</p> |
| |
| <p>Without the port map, each named port would be allocated a unique port number. |
| The <code>portmap</code> allows two different named ports to be aliased together. The default |
| <code>portmap</code> aliases the <code>aurora</code> port (i.e. <code>{{thermos.ports[aurora]}}</code>) to |
| the <code>http</code> port. Even though the two ports can be referenced independently, |
| only one port is allocated by Mesos. Any port referenced in a <code>Process</code> object |
| but which is not in the portmap will be allocated dynamically by Mesos and announced as well.</p> |
| |
| <p>It is possible to use the portmap to alias names to static port numbers, e.g. |
| <code>{'http': 80, 'https': 443, 'aurora': 'http'}</code>. In this case, referencing |
| <code>{{thermos.ports[aurora]}}</code> would look up <code>{{thermos.ports[http]}}</code> then |
| find a static port 80. No port would be requested of or allocated by Mesos.</p> |
| |
| <p>Static ports should be used cautiously as Aurora does nothing to prevent two |
| tasks with the same static port allocations from being co-scheduled. |
| External constraints such as slave attributes should be used to enforce such |
| guarantees should they be needed.</p> |
| |
| <h3 id="container-object">Container Object</h3> |
| |
| <p><em>Note: The only container type currently supported is “docker”. Docker support is currently EXPERIMENTAL.</em> |
| <em>Note: In order to correctly execute processes inside a job, the Docker container must have python 2.7 installed.</em></p> |
| |
| <p>Describes the container the job’s processes will run inside.</p> |
| |
| <table><thead> |
| <tr> |
| <th>param</th> |
| <th style="text-align: center">type</th> |
| <th>description</th> |
| </tr> |
| </thead><tbody> |
| <tr> |
| <td><code>docker</code></td> |
| <td style="text-align: center">Docker</td> |
| <td>A docker container to use.</td> |
| </tr> |
| </tbody></table> |
| |
| <h3 id="docker-object">Docker Object</h3> |
| |
| <table><thead> |
| <tr> |
| <th>param</th> |
| <th style="text-align: center">type</th> |
| <th>description</th> |
| </tr> |
| </thead><tbody> |
| <tr> |
| <td><code>image</code></td> |
| <td style="text-align: center">String</td> |
| <td>The name of the docker image to execute. If the image does not exist locally it will be pulled with <code>docker pull</code>.</td> |
| </tr> |
| <tr> |
| <td><code>parameters</code></td> |
| <td style="text-align: center">List(Parameter)</td> |
| <td>Additional parameters to pass to the docker containerizer.</td> |
| </tr> |
| </tbody></table> |
| |
| <h3 id="docker-parameter-object">Docker Parameter Object</h3> |
| |
| <p>Docker CLI parameters. This needs to be enabled by the scheduler <code>enable_docker_parameters</code> option. |
| See <a href="https://docs.docker.com/reference/commandline/run/">Docker Command Line Reference</a> for valid parameters. </p> |
| |
| <table><thead> |
| <tr> |
| <th>param</th> |
| <th style="text-align: center">type</th> |
| <th>description</th> |
| </tr> |
| </thead><tbody> |
| <tr> |
| <td><code>name</code></td> |
| <td style="text-align: center">String</td> |
| <td>The name of the docker parameter. E.g. volume</td> |
| </tr> |
| <tr> |
| <td><code>value</code></td> |
| <td style="text-align: center">String</td> |
| <td>The value of the parameter. E.g. /usr/local/bin:/usr/bin:rw</td> |
| </tr> |
| </tbody></table> |
| |
| <h3 id="lifecycleconfig-objects">LifecycleConfig Objects</h3> |
| |
| <p><em>Note: The only lifecycle configuration supported is the HTTP lifecycle via the HTTPLifecycleConfig.</em></p> |
| |
| <table><thead> |
| <tr> |
| <th>param</th> |
| <th style="text-align: center">type</th> |
| <th>description</th> |
| </tr> |
| </thead><tbody> |
| <tr> |
| <td><code>http</code></td> |
| <td style="text-align: center">HTTPLifecycleConfig</td> |
| <td>Configure the lifecycle manager to send lifecycle commands to the task via HTTP.</td> |
| </tr> |
| </tbody></table> |
| |
| <h3 id="httplifecycleconfig-objects">HTTPLifecycleConfig Objects</h3> |
| |
| <table><thead> |
| <tr> |
| <th>param</th> |
| <th style="text-align: center">type</th> |
| <th>description</th> |
| </tr> |
| </thead><tbody> |
| <tr> |
| <td><code>port</code></td> |
| <td style="text-align: center">String</td> |
| <td>The named port to send POST commands (Default: health)</td> |
| </tr> |
| <tr> |
| <td><code>graceful_shutdown_endpoint</code></td> |
| <td style="text-align: center">String</td> |
| <td>Endpoint to hit to indicate that a task should gracefully shutdown. (Default: /quitquitquit)</td> |
| </tr> |
| <tr> |
| <td><code>shutdown_endpoint</code></td> |
| <td style="text-align: center">String</td> |
| <td>Endpoint to hit to give a task its final warning before being killed. (Default: /abortabortabort)</td> |
| </tr> |
| </tbody></table> |
| |
| <h4 id="gracefulshutdownendpoint">graceful<em>shutdown</em>endpoint</h4> |
| |
| <p>If the Job is listening on the port as specified by the HTTPLifecycleConfig |
| (default: <code>health</code>), a HTTP POST request will be sent over localhost to this |
| endpoint to request that the task gracefully shut itself down. This is a |
| courtesy call before the <code>shutdown_endpoint</code> is invoked a fixed amount of |
| time later.</p> |
| |
| <h4 id="shutdown_endpoint">shutdown_endpoint</h4> |
| |
| <p>If the Job is listening on the port as specified by the HTTPLifecycleConfig |
| (default: <code>health</code>), a HTTP POST request will be sent over localhost to this |
| endpoint to request as a final warning before being shut down. If the task |
| does not shut down on its own after this, it will be forcefully killed</p> |
| |
| <h1 id="specifying-scheduling-constraints">Specifying Scheduling Constraints</h1> |
| |
| <p>In the <code>Job</code> object there is a map <code>constraints</code> from String to String |
| allowing the user to tailor the schedulability of tasks within the job.</p> |
| |
| <p>Each slave in the cluster is assigned a set of string-valued |
| key/value pairs called attributes. For example, consider the host |
| <code>cluster1-aaa-03-sr2</code> and its following attributes (given in key:value |
| format): <code>host:cluster1-aaa-03-sr2</code> and <code>rack:aaa</code>.</p> |
| |
| <p>The constraint map’s key value is the attribute name in which we |
| constrain Tasks within our Job. The value is how we constrain them. |
| There are two types of constraints: <em>limit constraints</em> and <em>value |
| constraints</em>.</p> |
| |
| <table><thead> |
| <tr> |
| <th>constraint</th> |
| <th>description</th> |
| </tr> |
| </thead><tbody> |
| <tr> |
| <td>Limit</td> |
| <td>A string that specifies a limit for a constraint. Starts with <code>'limit:</code> followed by an Integer and closing single quote, such as <code>'limit:1'</code>.</td> |
| </tr> |
| <tr> |
| <td>Value</td> |
| <td>A string that specifies a value for a constraint. To include a list of values, separate the values using commas. To negate the values of a constraint, start with a <code>!</code> <code>.</code></td> |
| </tr> |
| </tbody></table> |
| |
| <p>You can also control machine diversity using constraints. The below |
| constraint ensures that no more than two instances of your job may run |
| on a single host. Think of this as a “group by” limit.</p> |
| <pre class="highlight plaintext"><code>constraints = { |
| 'host': 'limit:2', |
| } |
| </code></pre> |
| |
| <p>Likewise, you can use constraints to control rack diversity, e.g. at |
| most one task per rack:</p> |
| <pre class="highlight plaintext"><code>constraints = { |
| 'rack': 'limit:1', |
| } |
| </code></pre> |
| |
| <p>Use these constraints sparingly as they can dramatically reduce Tasks’ schedulability.</p> |
| |
| <h1 id="template-namespaces">Template Namespaces</h1> |
| |
| <p>Currently, a few Pystachio namespaces have special semantics. Using them |
| in your configuration allow you to tailor application behavior |
| through environment introspection or interact in special ways with the |
| Aurora client or Aurora-provided services.</p> |
| |
| <h3 id="mesos-namespace">mesos Namespace</h3> |
| |
| <p>The <code>mesos</code> namespace contains variables which relate to the <code>mesos</code> slave |
| which launched the task. The <code>instance</code> variable can be used |
| to distinguish between Task replicas.</p> |
| |
| <table><thead> |
| <tr> |
| <th>variable name</th> |
| <th style="text-align: center">type</th> |
| <th>description</th> |
| </tr> |
| </thead><tbody> |
| <tr> |
| <td><code>instance</code></td> |
| <td style="text-align: center">Integer</td> |
| <td>The instance number of the created task. A job with 5 replicas has instance numbers 0, 1, 2, 3, and 4.</td> |
| </tr> |
| <tr> |
| <td><code>hostname</code></td> |
| <td style="text-align: center">String</td> |
| <td>The instance hostname that the task was launched on.</td> |
| </tr> |
| </tbody></table> |
| |
| <h3 id="thermos-namespace">thermos Namespace</h3> |
| |
| <p>The <code>thermos</code> namespace contains variables that work directly on the |
| Thermos platform in addition to Aurora. This namespace is fully |
| compatible with Tasks invoked via the <code>thermos</code> CLI.</p> |
| |
| <table><thead> |
| <tr> |
| <th style="text-align: center">variable</th> |
| <th>type</th> |
| <th>description</th> |
| </tr> |
| </thead><tbody> |
| <tr> |
| <td style="text-align: center"><code>ports</code></td> |
| <td>map of string to Integer</td> |
| <td>A map of names to port numbers</td> |
| </tr> |
| <tr> |
| <td style="text-align: center"><code>task_id</code></td> |
| <td>string</td> |
| <td>The task ID assigned to this task.</td> |
| </tr> |
| </tbody></table> |
| |
| <p>The <code>thermos.ports</code> namespace is automatically populated by Aurora when |
| invoking tasks on Mesos. When running the <code>thermos</code> command directly, |
| these ports must be explicitly mapped with the <code>-P</code> option.</p> |
| |
| <p>For example, if ’{{<code>thermos.ports[http]</code>}}’ is specified in a <code>Process</code> |
| configuration, it is automatically extracted and auto-populated by |
| Aurora, but must be specified with, for example, <code>thermos -P http:12345</code> |
| to map <code>http</code> to port 12345 when running via the CLI.</p> |
| |
| <h1 id="basic-examples">Basic Examples</h1> |
| |
| <p>These are provided to give a basic understanding of simple Aurora jobs.</p> |
| |
| <h3 id="hello_world-aurora">hello_world.aurora</h3> |
| |
| <p>Put the following in a file named <code>hello_world.aurora</code>, substituting your own values |
| for values such as <code>cluster</code>s.</p> |
| <pre class="highlight plaintext"><code>import os |
| hello_world_process = Process(name = 'hello_world', cmdline = 'echo hello world') |
| |
| hello_world_task = Task( |
| resources = Resources(cpu = 0.1, ram = 16 * MB, disk = 16 * MB), |
| processes = [hello_world_process]) |
| |
| hello_world_job = Job( |
| cluster = 'cluster1', |
| role = os.getenv('USER'), |
| task = hello_world_task) |
| |
| jobs = [hello_world_job] |
| </code></pre> |
| |
| <p>Then issue the following commands to create and kill the job, using your own values for the job key.</p> |
| <pre class="highlight plaintext"><code>aurora job create cluster1/$USER/test/hello_world hello_world.aurora |
| |
| aurora job kill cluster1/$USER/test/hello_world |
| </code></pre> |
| |
| <h3 id="environment-tailoring">Environment Tailoring</h3> |
| |
| <h4 id="helloworldproductionized-aurora">hello<em>world</em>productionized.aurora</h4> |
| |
| <p>Put the following in a file named <code>hello_world_productionized.aurora</code>, substituting your own values |
| for values such as <code>cluster</code>s.</p> |
| <pre class="highlight plaintext"><code>include('hello_world.aurora') |
| |
| production_resources = Resources(cpu = 1.0, ram = 512 * MB, disk = 2 * GB) |
| staging_resources = Resources(cpu = 0.1, ram = 32 * MB, disk = 512 * MB) |
| hello_world_template = hello_world( |
| name = "hello_world-{{cluster}}" |
| task = hello_world(resources=production_resources)) |
| |
| jobs = [ |
| # production jobs |
| hello_world_template(cluster = 'cluster1', instances = 25), |
| hello_world_template(cluster = 'cluster2', instances = 15), |
| |
| # staging jobs |
| hello_world_template( |
| cluster = 'local', |
| instances = 1, |
| task = hello_world(resources=staging_resources)), |
| ] |
| </code></pre> |
| |
| <p>Then issue the following commands to create and kill the job, using your own values for the job key</p> |
| <pre class="highlight plaintext"><code>aurora job create cluster1/$USER/test/hello_world-cluster1 hello_world_productionized.aurora |
| |
| aurora job kill cluster1/$USER/test/hello_world-cluster1 |
| </code></pre> |
| |
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