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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-59882] Autosplit tests may get one less chunk due to wuow commit delay</title>
                <link>https://jira.mongodb.org/browse/SERVER-59882</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Reasons:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;With the new splitter algorithm (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-55028&quot; title=&quot;Improve the auto-splitter policy&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-55028&quot;&gt;&lt;del&gt;SERVER-55028&lt;/del&gt;&lt;/a&gt; + &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-60009&quot; title=&quot;Increase auto splitted chunks size&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-60009&quot;&gt;&lt;del&gt;SERVER-60009&lt;/del&gt;&lt;/a&gt;) it must not be possible to end up with more chunks than expected.&lt;/li&gt;
	&lt;li&gt;The chunk splitter task is spawned &lt;a href=&quot;https://github.com/mongodb/mongo/blob/efad1224fba430f2f8346a924fe929861d9bdf4a/src/mongo/db/s/shard_server_op_observer.cpp#L219-L223&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;by the sharding observer&lt;/a&gt; before the actual commit of the &lt;tt&gt;WriteUnitOfWork&lt;/tt&gt; of the insert operation that is being observed. So it is actually possible for the last splitting round to be a no-op if the insert has not committed yet at the time of index scanning (intermediate split rounds could fail as well but subsequent ones would catch-up the missing splits).&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Tests to change:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;&lt;em&gt;shard_existing_coll_chunk_count.js&lt;/em&gt;: Since the purpose of the test is to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/efad1224fba430f2f8346a924fe929861d9bdf4a/jstests/sharding/shard_existing_coll_chunk_count.js#L3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;verify that the chunk splitter is not creating too many chunks&lt;/a&gt;, the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/efad1224fba430f2f8346a924fe929861d9bdf4a/jstests/sharding/shard_existing_coll_chunk_count.js#L85&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;greaterThanOrEqual check&lt;/a&gt; must be changed with a &lt;tt&gt;lessThanOrEqual&lt;/tt&gt; check.&lt;/li&gt;
	&lt;li&gt;&lt;em&gt;other autosplit js tests&lt;/em&gt;: check expected number of chunks or one less, due to reason 2&lt;/li&gt;
&lt;/ul&gt;

</description>
                <environment></environment>
        <key id="1871761">SERVER-59882</key>
            <summary>Autosplit tests may get one less chunk due to wuow commit delay</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="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</assignee>
                                    <reporter username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</reporter>
                        <labels>
                            <label>PM-2321-Chunk-Splitter</label>
                    </labels>
                <created>Fri, 10 Sep 2021 18:17:30 +0000</created>
                <updated>Sun, 29 Oct 2023 21:48:43 +0000</updated>
                            <resolved>Wed, 20 Oct 2021 09:16:31 +0000</resolved>
                                    <version>5.1.0</version>
                                    <fixVersion>5.2.0</fixVersion>
                    <fixVersion>5.1.0-rc2</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="4138119" author="xgen-internal-githook" created="Thu, 21 Oct 2021 09:56:17 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Pierlauro Sciarelli&apos;, &apos;email&apos;: &apos;pierlauro.sciarelli@mongodb.com&apos;, &apos;username&apos;: &apos;pierlauro&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-59882&quot; title=&quot;Autosplit tests may get one less chunk due to wuow commit delay&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-59882&quot;&gt;&lt;del&gt;SERVER-59882&lt;/del&gt;&lt;/a&gt; Autosplit tests may get one less chunk than expected due to wuow commit delay&lt;br/&gt;
Branch: v5.1&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f9f9302a5254b6ec976228c5d8cdf70b39ef96eb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f9f9302a5254b6ec976228c5d8cdf70b39ef96eb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4134581" author="xgen-internal-githook" created="Wed, 20 Oct 2021 09:03:38 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Pierlauro Sciarelli&apos;, &apos;email&apos;: &apos;pierlauro.sciarelli@mongodb.com&apos;, &apos;username&apos;: &apos;pierlauro&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-59882&quot; title=&quot;Autosplit tests may get one less chunk due to wuow commit delay&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-59882&quot;&gt;&lt;del&gt;SERVER-59882&lt;/del&gt;&lt;/a&gt; Autosplit tests may get one less chunk than expected due to wuow commit delay&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/80362db4494daa116f21e19c4c263621b897aead&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/80362db4494daa116f21e19c4c263621b897aead&lt;/a&gt;&lt;/p&gt;</comment>
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