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eadd35f6d5
The recent documentation formatting changes introduced the navigation panel on the left. However, due to the length of the query options navigation title these could overlap with the documentation paragraphs. This commit removes the underscores from the navigation titles of the query options, so browsers can break them into multiple lines. Additionally, the "SET" and "Query Options for the SET Statement" pages are merged to save some more space for the query option navigation titles. Testing: - Built the documentation and tested manually Change-Id: Icec787d7a2af848aaaff65be2ecf311a5ce8fe7f Reviewed-on: http://gerrit.cloudera.org:8080/20556 Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com> Reviewed-by: Jason Fehr <jfehr@cloudera.com> Reviewed-by: Peter Rozsa <prozsa@cloudera.com> Reviewed-by: Tamas Mate <tmater@apache.org>
68 lines
2.3 KiB
XML
68 lines
2.3 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="broadcast_bytes_limit">
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<title>BROADCAST_BYTES_LIMIT Query Option</title>
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<titlealts audience="PDF">
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<navtitle>BROADCAST BYTES LIMIT</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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</metadata>
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</prolog>
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<conbody>
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<p>
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<indexterm audience="hidden">BROADCAST_BYTES_LIMIT query option</indexterm> Sets the limit
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for the size of the broadcast input based on estimated size.
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</p>
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<p>
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The Impala planner may in rare cases make a bad choice to broadcast a large table or intermediate
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result and encounter performance problems due to high memory pressure. Setting this limit will
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make the planner pick a partition based hash join instead of broadcast and avoid such performance problems.
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</p>
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<p conref="../shared/impala_common.xml#common/type_integer"/>
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<p conref="../shared/impala_common.xml#common/default_blurb"/>
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<p>
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The default value is 34359738368 (32 GB). A value of 0 causes the option to be ignored.
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</p>
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<p conref="../shared/impala_common.xml#common/example_blurb"/>
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<codeblock><![CDATA[
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-- Change the limit to 16GB.
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set broadcast_bytes_limit=17179869184;
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-- Disable the BROADCAST_BYTES_LIMIT.
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set broadcast_bytes_limit=0;
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]]>
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</codeblock>
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</conbody>
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</concept>
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