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<h2 id="rest-api">REST API</h2>
<h3 id="get-sessions">GET /sessions</h3>
<p>Returns all the active interactive sessions.</p>
<h4 id="request-parameters">Request Parameters</h4>
<table class="table">
<tr><th>Name</th><th>Description</th><th>Type</th></tr>
<tr>
<td>from</td>
<td>The start index to fetch sessions</td>
<td>int</td>
</tr>
<tr>
<td>size</td>
<td>Number of sessions to fetch</td>
<td>int</td>
</tr>
</table>
<h4 id="response-body">Response Body</h4>
<table class="table">
<tr><th>Name</th><th>Description</th><th>Type</th></tr>
<tr>
<td>from</td>
<td>The start index to fetch sessions</td>
<td>int</td>
</tr>
<tr>
<td>total</td>
<td>Number of sessions to fetch</td>
<td>int</td>
</tr>
<tr>
<td>sessions</td>
<td><a href="#session">Session</a> list</td>
<td>list</td>
</tr>
</table>
<h3 id="post-sessions">POST /sessions</h3>
<p>Creates a new interactive Scala, Python, or R shell in the cluster.</p>
<h4 id="request-body">Request Body</h4>
<table class="table">
<tr><th>Name</th><th>Description</th><th>Type</th></tr>
<tr>
<td>kind</td>
<td>The session kind<sup><a href="#footnote1">[1]</a></sup></td>
<td><a href="#session-kind">session kind</a></td>
</tr>
<tr>
<td>proxyUser</td>
<td>User to impersonate when starting the session</td>
<td>string</td>
</tr>
<tr>
<td>jars</td>
<td>jars to be used in this session</td>
<td>List of string</td>
</tr>
<tr>
<td>pyFiles</td>
<td>Python files to be used in this session</td>
<td>List of string</td>
</tr>
<tr>
<td>files</td>
<td>files to be used in this session</td>
<td>List of string</td>
</tr>
<tr>
<td>driverMemory</td>
<td>Amount of memory to use for the driver process</td>
<td>string</td>
</tr>
<tr>
<td>driverCores</td>
<td>Number of cores to use for the driver process</td>
<td>int</td>
</tr>
<tr>
<td>executorMemory</td>
<td>Amount of memory to use per executor process</td>
<td>string</td>
</tr>
<tr>
<td>executorCores</td>
<td>Number of cores to use for each executor</td>
<td>int</td>
</tr>
<tr>
<td>numExecutors</td>
<td>Number of executors to launch for this session</td>
<td>int</td>
</tr>
<tr>
<td>archives</td>
<td>Archives to be used in this session</td>
<td>List of string</td>
</tr>
<tr>
<td>queue</td>
<td>The name of the YARN queue to which submitted</td>
<td>string</td>
</tr>
<tr>
<td>name</td>
<td>The name of this session</td>
<td>string</td>
</tr>
<tr>
<td>conf</td>
<td>Spark configuration properties</td>
<td>Map of key=val</td>
</tr>
<tr>
<td>heartbeatTimeoutInSecond</td>
<td>Timeout in second to which session be orphaned</td>
<td>int</td>
</tr>
</table>
<p><a id="footnote1">1</a>: Starting with version 0.5.0-incubating this field is not required. To be
compatible with previous versions users can still specify this with spark, pyspark or sparkr,
implying that the submitted code snippet is the corresponding kind.</p>
<h4 id="response-body-1">Response Body</h4>
<p>The created <a href="#session">Session</a>.</p>
<h3 id="get-sessionssessionid">GET /sessions/{sessionId}</h3>
<p>Returns the session information.</p>
<h4 id="response-body-2">Response Body</h4>
<p>The <a href="#session">Session</a>.</p>
<h3 id="get-sessionssessionidstate">GET /sessions/{sessionId}/state</h3>
<p>Returns the state of session</p>
<h4 id="response">Response</h4>
<table class="table">
<tr><th>Name</th><th>Description</th><th>Type</th></tr>
<tr>
<td>id</td>
<td>Session id</td>
<td>int</td>
</tr>
<tr>
<td>state</td>
<td>The current state of session</td>
<td>string</td>
</tr>
</table>
<h3 id="delete-sessionssessionid">DELETE /sessions/{sessionId}</h3>
<p>Kills the <a href="#session">Session</a> job.</p>
<h3 id="get-sessionssessionidlog">GET /sessions/{sessionId}/log</h3>
<p>Gets the log lines from this session.</p>
<h4 id="request-parameters-1">Request Parameters</h4>
<table class="table">
<tr><th>Name</th><th>Description</th><th>Type</th></tr>
<tr>
<td>from</td>
<td>Offset</td>
<td>int</td>
</tr>
<tr>
<td>size</td>
<td>Max number of log lines to return</td>
<td>int</td>
</tr>
</table>
<h4 id="response-body-3">Response Body</h4>
<table class="table">
<tr><th>Name</th><th>Description</th><th>Type</th></tr>
<tr>
<td>id</td>
<td>The session id</td>
<td>int</td>
</tr>
<tr>
<td>from</td>
<td>Offset from start of log</td>
<td>int</td>
</tr>
<tr>
<td>size</td>
<td>Max number of log lines</td>
<td>int</td>
</tr>
<tr>
<td>log</td>
<td>The log lines</td>
<td>list of strings</td>
</tr>
</table>
<h3 id="get-sessionssessionidstatements">GET /sessions/{sessionId}/statements</h3>
<p>Returns all the statements in a session.</p>
<h4 id="response-body-4">Response Body</h4>
<table class="table">
<tr><th>Name</th><th>Description</th><th>Type</th></tr>
<tr>
<td>statements</td>
<td><a href="#statement">statement</a> list</td>
<td>list</td>
</tr>
</table>
<h3 id="post-sessionssessionidstatements">POST /sessions/{sessionId}/statements</h3>
<p>Runs a statement in a session.</p>
<h4 id="request-body-1">Request Body</h4>
<table class="table">
<tr><th>Name</th><th>Description</th><th>Type</th></tr>
<tr>
<td>code</td>
<td>The code to execute</td>
<td>string</td>
</tr>
<tr>
<td>kind</td>
<td>The kind of code to execute<sup><a href="#footnote2">[2]</a></sup></td>
<td><a href="#session-kind">code kind</a></td>
</tr>
</table>
<p><a id="footnote2">2</a>: If session kind is not specified or the submitted code is not the kind
specified in session creation, this field should be filled with correct kind.
Otherwise Livy will use kind specified in session creation as the default code kind.</p>
<h4 id="response-body-5">Response Body</h4>
<p>The <a href="#statement">statement</a> object.</p>
<h3 id="get-sessionssessionidstatementsstatementid">GET /sessions/{sessionId}/statements/{statementId}</h3>
<p>Returns a specified statement in a session.</p>
<h4 id="response-body-6">Response Body</h4>
<p>The <a href="#statement">statement</a> object.</p>
<h3 id="post-sessionssessionidstatementsstatementidcancel">POST /sessions/{sessionId}/statements/{statementId}/cancel</h3>
<p>Cancel the specified statement in this session.</p>
<h4 id="response-body-7">Response Body</h4>
<table class="table">
<tr><th>Name</th><th>Description</th><th>Type</th></tr>
<tr>
<td>msg</td>
<td>is always "cancelled"</td>
<td>string</td>
</tr>
</table>
<h3 id="post-sessionssessionidcompletion">POST /sessions/{sessionId}/completion</h3>
<p>Runs a statement in a session.</p>
<h4 id="request-body-2">Request Body</h4>
<table class="table">
<tr><th>Name</th><th>Description</th><th>Type</th></tr>
<tr>
<td>code</td>
<td>The code for which completion proposals are requested</td>
<td>string</td>
</tr>
<tr>
<td>kind</td>
<td>The kind of code to execute<sup><a href="#footnote2">[2]</a></sup></td>
<td><a href="#session-kind">code kind</a></td>
</tr>
<tr>
<td>cursor</td>
<td>cursor position to get proposals</td>
<td>string</td>
</tr>
</table>
<h4 id="response-body-8">Response Body</h4>
<table class="table">
<tr><th>Name</th><th>Description</th><th>Type</th></tr>
<tr>
<td>candidates</td>
<td>Code completions proposals</td>
<td>array[string]</td>
</tr>
</table>
<h3 id="get-batches">GET /batches</h3>
<p>Returns all the active batch sessions.</p>
<h4 id="request-parameters-2">Request Parameters</h4>
<table class="table">
<tr><th>Name</th><th>Description</th><th>Type</th></tr>
<tr>
<td>from</td>
<td>The start index to fetch sessions</td>
<td>int</td>
</tr>
<tr>
<td>size</td>
<td>Number of sessions to fetch</td>
<td>int</td>
</tr>
</table>
<h4 id="response-body-9">Response Body</h4>
<table class="table">
<tr><th>Name</th><th>Description</th><th>Type</th></tr>
<tr>
<td>from</td>
<td>The start index of fetched sessions</td>
<td>int</td>
</tr>
<tr>
<td>total</td>
<td>Number of sessions fetched</td>
<td>int</td>
</tr>
<tr>
<td>sessions</td>
<td><a href="#batch">Batch</a> list</td>
<td>list</td>
</tr>
</table>
<h3 id="post-batches">POST /batches</h3>
<h4 id="request-body-3">Request Body</h4>
<table class="table">
<tr><th>Name</th><th>Description</th><th>Type</th></tr>
<tr>
<td>file</td>
<td>File containing the application to execute</td>
<td>path (required)</td>
</tr>
<tr>
<td>proxyUser</td>
<td>User to impersonate when running the job</td>
<td>string</td>
</tr>
<tr>
<td>className</td>
<td>Application Java/Spark main class</td>
<td>string</td>
</tr>
<tr>
<td>args</td>
<td>Command line arguments for the application</td>
<td>list of strings</td>
</tr>
<tr>
<td>jars</td>
<td>jars to be used in this session</td>
<td>list of strings</td>
</tr>
<tr>
<td>pyFiles</td>
<td>Python files to be used in this session</td>
<td>list of strings</td>
</tr>
<tr>
<td>files</td>
<td>files to be used in this session</td>
<td>list of strings</td>
</tr>
<tr>
<td>driverMemory</td>
<td>Amount of memory to use for the driver process</td>
<td>string</td>
</tr>
<tr>
<td>driverCores</td>
<td>Number of cores to use for the driver process</td>
<td>int</td>
</tr>
<tr>
<td>executorMemory</td>
<td>Amount of memory to use per executor process</td>
<td>string</td>
</tr>
<tr>
<td>executorCores</td>
<td>Number of cores to use for each executor</td>
<td>int</td>
</tr>
<tr>
<td>numExecutors</td>
<td>Number of executors to launch for this session</td>
<td>int</td>
</tr>
<tr>
<td>archives</td>
<td>Archives to be used in this session</td>
<td>List of string</td>
</tr>
<tr>
<td>queue</td>
<td>The name of the YARN queue to which submitted</td>
<td>string</td>
</tr>
<tr>
<td>name</td>
<td>The name of this session</td>
<td>string</td>
</tr>
<tr>
<td>conf</td>
<td>Spark configuration properties</td>
<td>Map of key=val</td>
</tr>
</table>
<h4 id="response-body-10">Response Body</h4>
<p>The created <a href="#batch">Batch</a> object.</p>
<h3 id="get-batchesbatchid">GET /batches/{batchId}</h3>
<p>Returns the batch session information.</p>
<h4 id="response-body-11">Response Body</h4>
<p>The <a href="#batch">Batch</a>.</p>
<h3 id="get-batchesbatchidstate">GET /batches/{batchId}/state</h3>
<p>Returns the state of batch session</p>
<h4 id="response-1">Response</h4>
<table class="table">
<tr><th>Name</th><th>Description</th><th>Type</th></tr>
<tr>
<td>id</td>
<td>Batch session id</td>
<td>int</td>
</tr>
<tr>
<td>state</td>
<td>The current state of batch session</td>
<td>string</td>
</tr>
</table>
<h3 id="delete-batchesbatchid">DELETE /batches/{batchId}</h3>
<p>Kills the <a href="#batch">Batch</a> job.</p>
<h3 id="get-batchesbatchidlog">GET /batches/{batchId}/log</h3>
<p>Gets the log lines from this batch.</p>
<h4 id="request-parameters-3">Request Parameters</h4>
<table class="table">
<tr><th>Name</th><th>Description</th><th>Type</th></tr>
<tr>
<td>from</td>
<td>Offset</td>
<td>int</td>
</tr>
<tr>
<td>size</td>
<td>Max number of log lines to return</td>
<td>int</td>
</tr>
</table>
<h4 id="response-body-12">Response Body</h4>
<table class="table">
<tr><th>Name</th><th>Description</th><th>Type</th></tr>
<tr>
<td>id</td>
<td>The batch id</td>
<td>int</td>
</tr>
<tr>
<td>from</td>
<td>Offset from start of log</td>
<td>int</td>
</tr>
<tr>
<td>size</td>
<td>Number of log lines</td>
<td>int</td>
</tr>
<tr>
<td>log</td>
<td>The log lines</td>
<td>list of strings</td>
</tr>
</table>
<h2 id="rest-objects">REST Objects</h2>
<h3 id="session">Session</h3>
<p>A session represents an interactive shell.</p>
<table class="table">
<tr><th>Name</th><th>Description</th><th>Type</th></tr>
<tr>
<td>id</td>
<td>The session id</td>
<td>int</td>
</tr>
<tr>
<td>appId</td>
<td>The application id of this session</td>
<td>string</td>
</tr>
<tr>
<td>owner</td>
<td>Remote user who submitted this session</td>
<td>string</td>
</tr>
<tr>
<td>proxyUser</td>
<td>User to impersonate when running</td>
<td>string</td>
</tr>
<tr>
<td>kind</td>
<td>Session kind (spark, pyspark, or sparkr)</td>
<td><a href="#session-kind">session kind</a></td>
</tr>
<tr>
<td>log</td>
<td>The log lines</td>
<td>list of strings</td>
</tr>
<tr>
<td>state</td>
<td>The session state</td>
<td>string</td>
</tr>
<tr>
<td>appInfo</td>
<td>The detailed application info</td>
<td>Map of key=val</td>
</tr>
</table>
<h4 id="session-state">Session State</h4>
<table class="table">
<tr><th>Value</th><th>Description</th></tr>
<tr>
<td>not_started</td>
<td>Session has not been started</td>
</tr>
<tr>
<td>starting</td>
<td>Session is starting</td>
</tr>
<tr>
<td>idle</td>
<td>Session is waiting for input</td>
</tr>
<tr>
<td>busy</td>
<td>Session is executing a statement</td>
</tr>
<tr>
<td>shutting_down</td>
<td>Session is shutting down</td>
</tr>
<tr>
<td>error</td>
<td>Session errored out</td>
</tr>
<tr>
<td>dead</td>
<td>Session has exited</td>
</tr>
<tr>
<td>killed</td>
<td>Session has been killed</td>
</tr>
<tr>
<td>success</td>
<td>Session is successfully stopped</td>
</tr>
</table>
<h4 id="session-kind">Session Kind</h4>
<table class="table">
<tr><th>Value</th><th>Description</th></tr>
<tr>
<td>spark</td>
<td>Interactive Scala Spark session</td>
</tr>
<tr>
<td><a href="#pyspark">pyspark</a></td>
<td>Interactive Python Spark session</td>
</tr>
<tr>
<td>sparkr</td>
<td>Interactive R Spark session</td>
</tr>
<tr>
<td>sql</td>
<td>Interactive SQL Spark session</td>
</tr>
</table>
<p>Starting with version 0.5.0-incubating, each session can support all four Scala, Python and R
interpreters with newly added SQL interpreter. The <code class="highlighter-rouge">kind</code> field in session creation
is no longer required, instead users should specify code kind (spark, pyspark, sparkr or sql)
during statement submission.</p>
<p>To be compatible with previous versions, users can still specify <code class="highlighter-rouge">kind</code> in session creation,
while ignoring <code class="highlighter-rouge">kind</code> in statement submission. Livy will then use this session
<code class="highlighter-rouge">kind</code> as default kind for all the submitted statements.</p>
<p>If users want to submit code other than default <code class="highlighter-rouge">kind</code> specified in session creation, users
need to specify code kind (spark, pyspark, sparkr or sql) during statement submission.</p>
<h4 id="pyspark">pyspark</h4>
<p>To change the Python executable the session uses, Livy reads the path from environment variable
<code class="highlighter-rouge">PYSPARK_PYTHON</code> (Same as pyspark).</p>
<p>Starting with version 0.5.0-incubating, session kind “pyspark3” is removed, instead users require
to set <code class="highlighter-rouge">PYSPARK_PYTHON</code> to python3 executable.</p>
<p>Like pyspark, if Livy is running in <code class="highlighter-rouge">local</code> mode, just set the environment variable.
If the session is running in <code class="highlighter-rouge">yarn-cluster</code> mode, please set
<code class="highlighter-rouge">spark.yarn.appMasterEnv.PYSPARK_PYTHON</code> in SparkConf so the environment variable is passed to
the driver.</p>
<h3 id="statement">Statement</h3>
<p>A statement represents the result of an execution statement.</p>
<table class="table">
<tr><th>Name</th><th>Description</th><th>Type</th></tr>
<tr>
<td>id</td>
<td>The statement id</td>
<td>integer</td>
</tr>
<tr>
<td>code</td>
<td>The execution code</td>
<td>string</td>
</tr>
<tr>
<td>state</td>
<td>The execution state</td>
<td>statement state</td>
</tr>
<tr>
<td>output</td>
<td>The execution output</td>
<td>statement output</td>
</tr>
</table>
<h4 id="statement-state">Statement State</h4>
<table class="table">
<tr><th>Value</th><th>Description</th></tr>
<tr>
<td>waiting</td>
<td>Statement is enqueued but execution hasn't started</td>
</tr>
<tr>
<td>running</td>
<td>Statement is currently running</td>
</tr>
<tr>
<td>available</td>
<td>Statement has a response ready</td>
</tr>
<tr>
<td>error</td>
<td>Statement failed</td>
</tr>
<tr>
<td>cancelling</td>
<td>Statement is being cancelling</td>
</tr>
<tr>
<td>cancelled</td>
<td>Statement is cancelled</td>
</tr>
</table>
<h4 id="statement-output">Statement Output</h4>
<table class="table">
<tr><th>Name</th><th>Description</th><th>Type</th></tr>
<tr>
<td>status</td>
<td>Execution status</td>
<td>string</td>
</tr>
<tr>
<td>execution_count</td>
<td>A monotonically increasing number</td>
<td>integer</td>
</tr>
<tr>
<td>data</td>
<td>Statement output</td>
<td>An object mapping a mime type to the result. If the mime type is
``application/json``, the value is a JSON value.</td>
</tr>
</table>
<h3 id="batch">Batch</h3>
<table class="table">
<tr><th>Name</th><th>Description</th><th>Type</th></tr>
<tr>
<td>id</td>
<td>The session id</td>
<td>int</td>
</tr>
<tr>
<td>appId</td>
<td>The application id of this session</td>
<td>string</td>
</tr>
<tr>
<td>appInfo</td>
<td>The detailed application info</td>
<td>Map of key=val</td>
</tr>
<tr>
<td>log</td>
<td>The log lines</td>
<td>list of strings</td>
</tr>
<tr>
<td>state</td>
<td>The batch state</td>
<td>string</td>
</tr>
</table>
<h3 id="proxy-user---doas-support">Proxy User - <code class="highlighter-rouge">doAs</code> support</h3>
<p>If superuser support is configured, Livy supports the <code class="highlighter-rouge">doAs</code> query parameter
to specify the user to impersonate. The <code class="highlighter-rouge">doAs</code> query parameter can be used
on any supported REST endpoint described above to perform the action as the
specified user. If both <code class="highlighter-rouge">doAs</code> and <code class="highlighter-rouge">proxyUser</code> are specified during session
or batch creation, the <code class="highlighter-rouge">doAs</code> parameter takes precedence.</p>
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