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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-77868] Balancer secondary thread should reset state on step up</title>
                <link>https://jira.mongodb.org/browse/SERVER-77868</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The secondary thread is using a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/de0e127b551c8293ca8a528c4244edf2858e90c2/src/mongo/db/s/balancer/balancer.cpp#L449-L450&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;ScopedTaskExecutor&lt;/a&gt;&#160;to schedule callbacks for&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/de0e127b551c8293ca8a528c4244edf2858e90c2/src/mongo/db/s/balancer/balancer.cpp#L568-L581&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the actions it submits&lt;/a&gt;. This means that those continuations are canceled on stepdown when the secondary thread exits. However, we are never clearing the state of&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/de0e127b551c8293ca8a528c4244edf2858e90c2/src/mongo/db/s/balancer/balancer.cpp#L496-L500&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;_outstandingStreamingOps&lt;/a&gt;&#160;(which is decremented&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/de0e127b551c8293ca8a528c4244edf2858e90c2/src/mongo/db/s/balancer/balancer.cpp#L456&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;in those callbacks&lt;/a&gt;). This means that if we have 20 outstanding operations for all collections on stepdown, on the next stepup of that node, our starting point is 20 and we count up from there. In the case that there are multiple stepdowns/stepups of the same node, this can accumulate and hit&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/de0e127b551c8293ca8a528c4244edf2858e90c2/src/mongo/db/s/balancer/balancer.h#L153&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;kMaxOutstandingStreamingOperations&lt;/a&gt;&#160;which means that the node will never issue any more defragmentation operations.&lt;/p&gt;

&lt;p&gt;The solution to this would be as simple as resetting _outstandingStreamingOps to 0 on step up. We should also consider the auto merger policy which is using a similar approach to cap the outstanding merges. We likely have the same issue with _outstandingActions in the autoMerger and should also set that value to 0 on initialization.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2361137">SERVER-77868</key>
            <summary>Balancer secondary thread should reset state on step up</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="13201">Fixed</resolution>
                                        <assignee username="allison.easton@mongodb.com">Allison Easton</assignee>
                                    <reporter username="allison.easton@mongodb.com">Allison Easton</reporter>
                        <labels>
                    </labels>
                <created>Wed, 7 Jun 2023 13:57:17 +0000</created>
                <updated>Sun, 29 Oct 2023 21:20:22 +0000</updated>
                            <resolved>Fri, 9 Jun 2023 06:05:05 +0000</resolved>
                                    <version>7.1.0-rc0</version>
                    <version>6.0.6</version>
                    <version>7.0.0-rc2</version>
                                    <fixVersion>7.1.0-rc0</fixVersion>
                    <fixVersion>6.0.7</fixVersion>
                    <fixVersion>7.0.0-rc4</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5494653" author="xgen-internal-githook" created="Tue, 13 Jun 2023 11:28:26 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Allison Easton&apos;, &apos;email&apos;: &apos;allison.easton@mongodb.com&apos;, &apos;username&apos;: &apos;allisoneaston&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-77868&quot; title=&quot;Balancer secondary thread should reset state on step up&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-77868&quot;&gt;&lt;del&gt;SERVER-77868&lt;/del&gt;&lt;/a&gt; Balancer secondary thread should reset state on step up&lt;br/&gt;
(cherry picked from commit c80210290982aaf7711993b98a1c39e02586f8a4)&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8a97351e0fb6d21b1d9d431a66c1a1da833b0d8d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8a97351e0fb6d21b1d9d431a66c1a1da833b0d8d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5492408" author="xgen-internal-githook" created="Mon, 12 Jun 2023 16:19:06 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Allison Easton&apos;, &apos;email&apos;: &apos;allison.easton@mongodb.com&apos;, &apos;username&apos;: &apos;allisoneaston&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-77868&quot; title=&quot;Balancer secondary thread should reset state on step up&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-77868&quot;&gt;&lt;del&gt;SERVER-77868&lt;/del&gt;&lt;/a&gt; Balancer secondary thread should reset state on step up&lt;/p&gt;

&lt;p&gt;(cherry picked from commit c80210290982aaf7711993b98a1c39e02586f8a4)&lt;br/&gt;
Branch: v7.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5ee2b07959ba47a748a4cffdba9521a028e28a2f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5ee2b07959ba47a748a4cffdba9521a028e28a2f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5485680" author="xgen-internal-githook" created="Thu, 8 Jun 2023 17:21:04 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Allison Easton&apos;, &apos;email&apos;: &apos;allison.easton@mongodb.com&apos;, &apos;username&apos;: &apos;allisoneaston&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-77868&quot; title=&quot;Balancer secondary thread should reset state on step up&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-77868&quot;&gt;&lt;del&gt;SERVER-77868&lt;/del&gt;&lt;/a&gt; Balancer secondary thread should reset state on step up&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c80210290982aaf7711993b98a1c39e02586f8a4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c80210290982aaf7711993b98a1c39e02586f8a4&lt;/a&gt;&lt;/p&gt;</comment>
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