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These are refugees from doc_prototype. They can be rendered with the DITA Open Toolkit version 2.3.3 by: /tmp/dita-ot-2.3.3/bin/dita \ -i impala.ditamap \ -f html5 \ -o $(mktemp -d) \ -filter impala_html.ditaval Change-Id: I8861e99adc446f659a04463ca78c79200669484f Reviewed-on: http://gerrit.cloudera.org:8080/5014 Reviewed-by: John Russell <jrussell@cloudera.com> Tested-by: John Russell <jrussell@cloudera.com>
39 lines
1.6 KiB
XML
39 lines
1.6 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE concept PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
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<concept id="disable_codegen">
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<title>DISABLE_CODEGEN Query Option</title>
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<titlealts audience="PDF"><navtitle>DISABLE_CODEGEN</navtitle></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="Troubleshooting"/>
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<data name="Category" value="Performance"/>
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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="Cloudera">DISABLE_CODEGEN query option</indexterm>
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This is a debug option, intended for diagnosing and working around issues that cause crashes. If a query
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fails with an <q>illegal instruction</q> or other hardware-specific message, try setting
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<codeph>DISABLE_CODEGEN=true</codeph> and running the query again. If the query succeeds only when the
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<codeph>DISABLE_CODEGEN</codeph> option is turned on, submit the problem to <keyword keyref="support_org"/> and include that
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detail in the problem report. Do not otherwise run with this setting turned on, because it results in lower
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overall performance.
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</p>
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<p>
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Because the code generation phase adds a small amount of overhead for each query, you might turn on the
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<codeph>DISABLE_CODEGEN</codeph> option to achieve maximum throughput when running many short-lived queries
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against small tables.
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</p>
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<p conref="../shared/impala_common.xml#common/type_boolean"/>
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<p conref="../shared/impala_common.xml#common/default_false_0"/>
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</conbody>
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</concept>
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