mirror of
https://github.com/apache/impala.git
synced 2025-12-19 09:58:28 -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>
69 lines
3.1 KiB
XML
69 lines
3.1 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="SPOOL_QUERY_RESULTS" rev="2.10.0 IMPALA-3200">
|
|
<title>SPOOL_QUERY_RESULTS Query Option</title>
|
|
<titlealts audience="PDF">
|
|
<navtitle>SPOOL QUERY RESULTS</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>SPOOL_QUERY_RESULTS</codeph> query option to enable query
|
|
result spooling, which is disabled by default.</p>
|
|
<p>Query result spooling controls how rows are returned to the client. <ul>
|
|
<li>When query result spooling is disabled (<codeph>SPOOL_QUERY_RESULTS
|
|
= FALSE</codeph>), Impala relies on clients to fetch results to
|
|
trigger the generation of more result row batches until all the result
|
|
rows have been produced. If a client issues a query without fetching
|
|
all the results, the query fragments will continue to consume the
|
|
resources until the query is cancelled and unregistered, potentially
|
|
tying up resources and cause other queries to wait for extended period
|
|
of time in admission control.</li>
|
|
<li>When query result spooling is enabled (<codeph>SPOOL_QUERY_RESULTS =
|
|
TRUE</codeph>), the result sets of queries are eagerly fetched and
|
|
spooled, either in memory or on disk. <p>Once all result rows have
|
|
been fetched and stored in the spooling location, the resources are
|
|
freed up. Incoming client fetches can get the data from the spooled
|
|
results.</p></li>
|
|
</ul></p>
|
|
<p><b>Type:</b>
|
|
<codeph>BOOLEAN</codeph></p>
|
|
<p><b>Default:</b>
|
|
<codeph>FALSE</codeph></p>
|
|
<p><b>Added in:</b>
|
|
<keyword keyref="impala34"/></p>
|
|
<p><b>Related information:</b>
|
|
<xref
|
|
href="impala_default_spillable_buffer_size.xml#default_spillable_buffer_size"
|
|
/>, <xref
|
|
href="impala_max_spilled_result_spooling_mem.xml#MAX_SPILLED_RESULT_SPOOLING_MEM"
|
|
/>, <xref
|
|
href="impala_max_result_spooling_mem.xml#MAX_RESULT_SPOOLING_MEM"/></p>
|
|
</conbody>
|
|
</concept>
|