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Change-Id: Ia665e3f230f218d8bbf998dfd1ae21338c21b36e Reviewed-on: http://gerrit.cloudera.org:8080/12908 Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com> Reviewed-by: Alex Rodoni <arodoni@cloudera.com>
102 lines
3.1 KiB
XML
102 lines
3.1 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!--
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Licensed to the Apache Software Foundation (ASF) under one
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or more contributor license agreements. See the NOTICE file
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distributed with this work for additional information
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regarding copyright ownership. The ASF licenses this file
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to you under the Apache License, Version 2.0 (the
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"License"); you may not use this file except in compliance
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with the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing,
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software distributed under the License is distributed on an
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"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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KIND, either express or implied. See the License for the
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specific language governing permissions and limitations
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under the License.
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-->
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<!DOCTYPE concept PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
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<concept rev="2.12.0" id="idle_session_timeout">
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<title>IDLE_SESSION_TIMEOUT Query Option (<keyword keyref="impala212_full"/> or higher only)</title>
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<titlealts audience="PDF">
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<navtitle>IDLE_SESSION_TIMEOUT</navtitle>
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</titlealts>
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<prolog>
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<metadata>
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<data name="Category" value="Impala"/>
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<data name="Category" value="Impala Query Options"/>
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<data name="Category" value="Querying"/>
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<data name="Category" value="Developers"/>
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<data name="Category" value="Data Analysts"/>
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</metadata>
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</prolog>
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<conbody>
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<p rev="2.12.0">
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The <codeph>IDLE_SESSION_TIMEOUT</codeph> query option sets the time in seconds after
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which an idle session is cancelled. A session is idle when no activity is occurring for
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any of the queries in that session, and the session has not started any new queries. Once
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a session is expired, you cannot issue any new query requests to it. The session remains
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open, but the only operation you can perform is to close it.
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</p>
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<p rev="2.12.0">
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The <codeph>IDLE_SESSION_TIMEOUT</codeph> query option overrides the
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<codeph>‑‑idle_session_timeout</codeph> startup option. See
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<xref href="impala_timeouts.xml#timeouts"/> for the
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<codeph>‑‑idle_session_timeout</codeph> startup option.
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</p>
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<p>
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The <codeph>IDLE_SESSION_TIMEOUT</codeph> query option allows JDBC/ODBC connections to set
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the session timeout as a query option with the <codeph>SET</codeph> statement.
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</p>
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<p>
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<b>Syntax:</b>
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</p>
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<codeblock>SET IDLE_SESSION_TIMEOUT=<varname>seconds</varname>;</codeblock>
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<p>
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<b>Type:</b> numeric
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</p>
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<p>
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<b>Default:</b> 0
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<ul>
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<li>
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If <codeph>‑‑idle_session_timeout</codeph> is not set, the session never
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expires.
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</li>
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<li>
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If <codeph>‑‑idle_session_timeout</codeph> is set, use that timeout value.
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</li>
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</ul>
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</p>
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<p>
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<b>Added in:</b> <keyword keyref="impala212_full"/>
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</p>
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<p>
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<b>Related information:</b>
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</p>
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<p>
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<xref href="impala_timeouts.xml#timeouts"/>
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</p>
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</conbody>
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</concept>
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