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    <title>MongoDB Jira</title>
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    <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-16640] Long running queries on the secondary with WT</title>
                <link>https://jira.mongodb.org/browse/SERVER-16640</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We have disabled yielding with WT, because it is not necessary due to the use of snapshots.&lt;/p&gt;

&lt;p&gt;On secondaries though, because of the way the Parallel Batch Writer lock is implemented, it is possible that a long running query would prevent the log applier threads from starting until it is completed and thus cause backlog.&lt;/p&gt;

&lt;p&gt;This ticket is to verify this behaviour and if it turns out to be true to figure out a solution.&lt;/p&gt;</description>
                <environment></environment>
        <key id="175869">SERVER-16640</key>
            <summary>Long running queries on the secondary with WT</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="kaloian.manassiev@mongodb.com">Kaloian Manassiev</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                    </labels>
                <created>Mon, 22 Dec 2014 22:45:36 +0000</created>
                <updated>Thu, 15 Jan 2015 16:46:55 +0000</updated>
                            <resolved>Mon, 29 Dec 2014 20:53:57 +0000</resolved>
                                                    <fixVersion>2.8.0-rc5</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="794822" author="kaloian.manassiev" created="Mon, 29 Dec 2014 20:52:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kaloianm&apos;, u&apos;name&apos;: u&apos;Kaloian Manassiev&apos;, u&apos;email&apos;: u&apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16431&quot; title=&quot;Get rid of the ParallelBatchWriter mutex (aka &amp;quot;peanut-butter&amp;quot; lock)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16431&quot;&gt;&lt;del&gt;SERVER-16431&lt;/del&gt;&lt;/a&gt; Enable yielding for all storage engines&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8f83ff2335ea0e2dd0dc2fc79b6509c4f8f2d4fc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8f83ff2335ea0e2dd0dc2fc79b6509c4f8f2d4fc&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="793839" author="schwerin" created="Wed, 24 Dec 2014 21:04:05 +0000"  >&lt;p&gt;Lack of yielding helped expose &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16651&quot; title=&quot;Mass deletions and updates (including TTL) completely starve insertions in replica set under WiredTiger&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16651&quot;&gt;&lt;del&gt;SERVER-16651&lt;/del&gt;&lt;/a&gt;, or more pessimistically, exacerbated it.  Essentially, without yielding, long-running operations cause all acquisitions of the global lock in MODE_S or MODE_X to potentially block future read and write operations to individual collections.  I recommend bringing yielding behavior into doc-locking storage engines.  The underlying mechanisms are already present, anyways, since locks must be released between getMore calls in the current implementation of mongod.&lt;/p&gt;</comment>
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            <issuekey id="176091">SERVER-16667</issuekey>
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