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Change-Id: I8927c9cd61f0274ad91111d6ac4a079f7a563197 Reviewed-on: http://gerrit.cloudera.org:8080/21615 Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com> Reviewed-by: Yida Wu <wydbaggio000@gmail.com> Reviewed-by: Wenzhe Zhou <wzhou@cloudera.com>
51 lines
2.6 KiB
XML
51 lines
2.6 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="impala_ha">
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<title>Configuring Impala for High Availability</title>
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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="Administrators"/>
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<data name="Category" value="High Availability"/>
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<data name="Category" value="Configuring"/>
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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>The Impala StateStore checks on the health of all Impala daemons in a cluster, and
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continuously relays its findings to each of the daemons. The Catalog stores metadata of
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databases, tables, partitions, resource usage information, configuration settings, and other
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objects managed by Impala. If StateStore and Catalog daemons are single instances in an Impala
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cluster, it will create a single point of failure. Although Impala coordinators/executors
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continue to execute queries if the StateStore node is down, coordinators/executors will not
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get state updates. This causes degradation of admission control & cluster membership
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updates. To mitigate this, a pair of StateStore and Catalog instances can be deployed in an
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Impala cluster so that Impala cluster could survive failures of StateStore or Catalog.</p>
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<p><b>Prerequisite:</b></p>
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<p>To enable High Availability for Impala CatalogD and StateStore, you must configure at least
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two Impala CatalogD, two StateStore instances on two different nodes.<note
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id="note_dg1_qhh_fcc" type="note">CatalogD HA and Statestore HA are independent features.
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Users can enable CatalogD HA, Statestore HA, or both CatalogD HA and Statestore
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HA.</note></p>
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<p outputclass="toc"/>
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</conbody>
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</concept>
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