mirror of
https://github.com/apache/impala.git
synced 2025-12-25 02:03:09 -05:00
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>
67 lines
3.0 KiB
XML
67 lines
3.0 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
|
|
<!--
|
|
Licensed to the Apache Software Foundation (ASF) under one
|
|
or more contributor license agreements. See the NOTICE file
|
|
distributed with this work for additional information
|
|
regarding copyright ownership. The ASF licenses this file
|
|
to you under the Apache License, Version 2.0 (the
|
|
"License"); you may not use this file except in compliance
|
|
with the License. You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing,
|
|
software distributed under the License is distributed on an
|
|
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
|
|
KIND, either express or implied. See the License for the
|
|
specific language governing permissions and limitations
|
|
under the License.
|
|
-->
|
|
<!DOCTYPE concept PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
|
|
<concept id="FETCH_ROWS_TIMEOUT_MS">
|
|
<title>FETCH_ROWS_TIMEOUT_MS Query Option</title>
|
|
<titlealts audience="PDF">
|
|
<navtitle>FETCH ROWS TIMEOUT MS</navtitle>
|
|
</titlealts>
|
|
<prolog>
|
|
<metadata>
|
|
<data name="Category" value="Impala"/>
|
|
<data name="Category" value="Impala Query Options"/>
|
|
<data name="Category" value="Querying"/>
|
|
<data name="Category" value="Developers"/>
|
|
<data name="Category" value="Data Analysts"/>
|
|
</metadata>
|
|
</prolog>
|
|
<conbody>
|
|
<p>Use the <codeph>FETCH_ROWS_TIMEOUT_MS</codeph> query option to control
|
|
how long Impala waits for query results when clients fetch rows.</p>
|
|
<p> When this query option is set to <codeph>0</codeph>, fetch requests wait
|
|
indefinitely.</p>
|
|
<p>The timeout applies both when query result spooling is enabled and disabled:<ul>
|
|
<li>When result spooling is disabled (<codeph>SPOOL_QUERY_RESULTS =
|
|
FALSE</codeph>), the timeout controls how long a client waits for a
|
|
single row batch to be produced by the coordinator. </li>
|
|
<li>When result spooling is enabled ( (<codeph>SPOOL_QUERY_RESULTS =
|
|
TRUE</codeph>), a client can fetch multiple row batches at a time,
|
|
so this timeout controls the total time a client waits for row batches
|
|
to be produced.</li>
|
|
</ul></p>
|
|
<p>The timeout also applies to fetch requests issued against queries in the
|
|
'RUNNING' state. A 'RUNNING' query has no rows available, so any fetch
|
|
request will wait until the query transitions to the 'FINISHED' state and
|
|
for it to fetch all requested rows. A query in the 'FINISHED' state means
|
|
that the rows are available to be fetched.</p>
|
|
<p><b>Type:</b>
|
|
<codeph>INT</codeph></p>
|
|
<p><b>Default:</b>
|
|
<codeph>10000</codeph> (10 seconds)</p>
|
|
<p><b>Added in:</b>
|
|
<keyword keyref="impala34"/></p>
|
|
<p><b>Related information:</b>
|
|
<xref href="impala_max_result_spooling_mem.xml#MAX_RESULT_SPOOLING_MEM"/>,
|
|
<xref
|
|
href="impala_max_spilled_result_spooling_mem.xml#MAX_SPILLED_RESULT_SPOOLING_MEM"
|
|
/>, <xref href="impala_spool_query_results.xml#SPOOL_QUERY_RESULTS"/></p>
|
|
</conbody>
|
|
</concept>
|