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22ac00fd4d
Adds a few basic docs for fault tolerance in Impala. Covers the following topics: * Transparent query retries * Node blacklisting * Statestore heartbeats This commit only adds a high level explanation of the afortmentioned fault tolerance concepts. The docs should be expanded on in a future commit. Change-Id: I9d178b21a9654bbed8b814ccadca95703ffacb62 Reviewed-on: http://gerrit.cloudera.org:8080/16610 Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com> Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
35 lines
1.6 KiB
XML
35 lines
1.6 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="node_blacklisting">
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<title>Impala Node Blacklisting</title>
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<conbody>
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<p>Node Blacklisting allows Impala Coordinators to be more aggressive
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about deciding that an executor is unhealthy or unavailable, to
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minimize failed queries in environments where cluster membership maybe
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more variable, rather than having to wait on the statestore heartbeat
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mechanism to decide that the executor is down.</p>
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<p>Node blacklists are local to a coordinator. A node is put on the
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blacklist based on information from failed queries. Nodes are only
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blacklisted temporarily, and are taken off the blacklist after a
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certain period of time.</p>
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</conbody>
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</concept>
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