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d484d2f684
This now gives a clean RAT check with bin/check-rat-report.py, which is one way for the Impala community to check compliance with ASF rules on intellectual property. Change-Id: I2ad06435f84a65ba126759e42a18fdaf52cd7036 Reviewed-on: http://gerrit.cloudera.org:8080/5232 Reviewed-by: Jim Apple <jbapple-impala@apache.org> Tested-by: Impala Public Jenkins Reviewed-by: John Russell <jrussell@cloudera.com>
57 lines
2.4 KiB
XML
57 lines
2.4 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="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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