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Change-Id: I07d56463939fe152c1c6124cc0ad5591337bad6b Reviewed-on: http://gerrit.cloudera.org:8080/6179 Reviewed-by: Ambreen Kazi <ambreen.kazi@cloudera.com> Tested-by: Impala Public Jenkins Reviewed-by: John Russell <jrussell@cloudera.com>
131 lines
4.2 KiB
XML
131 lines
4.2 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 id="processes">
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<title>Starting Impala</title>
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<prolog>
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<metadata>
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<data name="Category" value="Starting and Stopping"/>
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<data name="Category" value="Impala"/>
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<data name="Category" value="Administrators"/>
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<data name="Category" value="Operators"/>
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</metadata>
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</prolog>
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<conbody>
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<p rev="1.2">
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<indexterm audience="hidden">state store</indexterm>
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<indexterm audience="hidden">starting services</indexterm>
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<indexterm audience="hidden">services</indexterm>
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To activate Impala if it is installed but not yet started:
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</p>
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<ol>
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<li>
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Set any necessary configuration options for the Impala services. See
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<xref href="impala_config_options.xml#config_options"/> for details.
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</li>
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<li>
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Start one instance of the Impala statestore. The statestore helps Impala to distribute work efficiently,
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and to continue running in the event of availability problems for other Impala nodes. If the statestore
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becomes unavailable, Impala continues to function.
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</li>
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<li>
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Start one instance of the Impala catalog service.
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</li>
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<li>
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Start the main Impala service on one or more DataNodes, ideally on all DataNodes to maximize local
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processing and avoid network traffic due to remote reads.
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</li>
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</ol>
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<p>
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Once Impala is running, you can conduct interactive experiments using the instructions in
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<xref href="impala_tutorial.xml#tutorial"/> and try <xref href="impala_impala_shell.xml#impala_shell"/>.
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</p>
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<p outputclass="toc inpage"/>
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</conbody>
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<concept id="starting_via_cmdline">
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<title>Starting Impala from the Command Line</title>
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<conbody>
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<p>
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To start the Impala state store and Impala from the command line or a script, you can either use the
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<cmdname>service</cmdname> command or you can start the daemons directly through the
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<cmdname>impalad</cmdname>, <codeph>statestored</codeph>, and <cmdname>catalogd</cmdname> executables.
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</p>
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<p>
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Start the Impala statestore and then start <codeph>impalad</codeph> instances. You can modify the values
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the service initialization scripts use when starting the statestore and Impala by editing
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<codeph>/etc/default/impala</codeph>.
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</p>
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<p>
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Start the statestore service using a command similar to the following:
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</p>
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<p>
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<codeblock>$ sudo service impala-state-store start</codeblock>
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</p>
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<p rev="1.2">
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Start the catalog service using a command similar to the following:
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</p>
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<codeblock rev="1.2">$ sudo service impala-catalog start</codeblock>
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<p>
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Start the Impala service on each DataNode using a command similar to the following:
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</p>
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<p>
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<codeblock>$ sudo service impala-server start</codeblock>
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</p>
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<note>
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<p conref="../shared/impala_common.xml#common/udf_persistence_restriction"/>
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</note>
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<p>
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If any of the services fail to start, review:
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<ul>
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<li>
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<xref href="impala_logging.xml#logs_debug"/>
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</li>
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<li>
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<xref href="impala_troubleshooting.xml#troubleshooting"/>
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</li>
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</ul>
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</p>
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</conbody>
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</concept>
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</concept>
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