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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-13499] Yield policy for batch-inserts should be the same as for batch-updates/deletes</title>
                <link>https://jira.mongodb.org/browse/SERVER-13499</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;div class=&quot;panel&quot; style=&quot;background-color: #EEEEEE;border-color: #ccc;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;border-bottom-color: #ccc;background-color: #6CB33F;&quot;&gt;&lt;b&gt;Issue Status as of April 16, 2014&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #EEEEEE;&quot;&gt;
&lt;p&gt;&lt;b&gt;ISSUE SUMMARY&lt;/b&gt;&lt;br/&gt;
Batch inserts can potentially yield after each single insert. This can negatively impact performance and is inconsistent with the yield policy of batch updates and deletes, which check less frequently.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;USER IMPACT&lt;/b&gt;&lt;br/&gt;
Bulk insert tasks have a noticeable performance penalty compared to previous versions of MongoDB. &lt;/p&gt;

&lt;p&gt;&lt;b&gt;WORKAROUNDS&lt;/b&gt;&lt;br/&gt;
An older version of the driver that does not use the write commands is unaffected by this issue and can be used as a workaround with MongoDB 2.6.0. &lt;/p&gt;

&lt;p&gt;&lt;b&gt;RESOLUTION&lt;/b&gt;&lt;br/&gt;
Changing the yielding policy to the same as updates/deletes (allow yields less frequently) improves insert performance significantly (by ~28% in internal tests).&lt;/p&gt;

&lt;p&gt;&lt;b&gt;AFFECTED VERSIONS&lt;/b&gt;&lt;br/&gt;
Version 2.6.0 is affected by this bug.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;PATCHES&lt;/b&gt;&lt;br/&gt;
The patch is included in the 2.6.1 production release.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h6&gt;&lt;a name=&quot;Originaldescription&quot;&gt;&lt;/a&gt;Original description&lt;/h6&gt;

&lt;p&gt;For batch inserts, we were checking to yield after each insert.  Batch updates/deletes only check every 100 operations, so batch inserts should be changed to match.&lt;/p&gt;</description>
                <environment></environment>
        <key id="129658">SERVER-13499</key>
            <summary>Yield policy for batch-inserts should be the same as for batch-updates/deletes</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="9">Done</resolution>
                                        <assignee username="milkie@mongodb.com">Eric Milkie</assignee>
                                    <reporter username="alvin">Alvin Richards</reporter>
                        <labels>
                            <label>26qa</label>
                    </labels>
                <created>Sun, 6 Apr 2014 20:47:54 +0000</created>
                <updated>Mon, 11 Jul 2016 17:18:57 +0000</updated>
                            <resolved>Wed, 16 Apr 2014 14:51:46 +0000</resolved>
                                    <version>2.6.0-rc3</version>
                                    <fixVersion>2.6.1</fixVersion>
                    <fixVersion>2.7.0</fixVersion>
                                    <component>Write Ops</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="542370" author="xgen-internal-githook" created="Wed, 9 Apr 2014 16:02:12 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;milkie&apos;, u&apos;name&apos;: u&apos;Eric Milkie&apos;, u&apos;email&apos;: u&apos;milkie@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13499&quot; title=&quot;Yield policy for batch-inserts should be the same as for batch-updates/deletes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13499&quot;&gt;&lt;del&gt;SERVER-13499&lt;/del&gt;&lt;/a&gt; bulk insert check for yield less often&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 68d42de9a958688acbf659dfb651fb699e9d7394)&lt;/p&gt;

&lt;p&gt;Conflicts:&lt;br/&gt;
	src/mongo/db/commands/write_commands/batch_executor.cpp&lt;br/&gt;
Branch: v2.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ffa99f0d369e9eabd8eafa4ac5ff412075458c34&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ffa99f0d369e9eabd8eafa4ac5ff412075458c34&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="542249" author="xgen-internal-githook" created="Wed, 9 Apr 2014 14:58:20 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;milkie&apos;, u&apos;name&apos;: u&apos;Eric Milkie&apos;, u&apos;email&apos;: u&apos;milkie@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13499&quot; title=&quot;Yield policy for batch-inserts should be the same as for batch-updates/deletes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13499&quot;&gt;&lt;del&gt;SERVER-13499&lt;/del&gt;&lt;/a&gt; bulk insert check for yield less often&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/68d42de9a958688acbf659dfb651fb699e9d7394&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/68d42de9a958688acbf659dfb651fb699e9d7394&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="539562" author="milkie" created="Mon, 7 Apr 2014 19:04:03 +0000"  >&lt;p&gt;This will be easy to fix; I&apos;ll just make it use the same elapsedTracker that the runner yield policy uses.  It waits for 127 hits or 10ms to pass before calling suggestYieldMicros(), which is a terribly inefficient function, particularly if you have lots of outstanding connections (even if they are idle).&lt;/p&gt;</comment>
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