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    <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-29834] only the active moveChunk on a shard will set the last opTime to wait for writeConcern for</title>
                <link>https://jira.mongodb.org/browse/SERVER-29834</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When multiple moveChunk commands &quot;pile up&quot; on a shard, only the first one actually runs, does the range deletion, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.5.9/src/mongo/db/s/move_chunk_command.cpp#L236-L238&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;b&gt;and sets the last opTime on ReplClientInfo after performing the range deletion&lt;/b&gt;&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Therefore, when the other moveChunk commands &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.5.9/src/mongo/db/service_entry_point_mongod.cpp#L306-L309&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;go to wait for write concern before returning&lt;/a&gt;, they are not waiting on an opTime that includes the range deletion deletes.&lt;/p&gt;

&lt;p&gt;So, it is possible (as occurred frequently in BF-5452) for a config stepdown to happen during a manual migration initiated through mongos; mongos to retry the manual migration; and the second manual migration to return before the range deletes have actually replicated.&lt;/p&gt;

&lt;p&gt;If mongos then performs a secondary read including the donated range (which in v3.4 is unversioned, so will be sent to the donor shard) the read can return duplicate documents (because they have not yet been deleted). This is true even if the moveChunk request had waitForDelete: true and writeConcern: majority, and the read had readConcern: majority.&lt;/p&gt;</description>
                <environment></environment>
        <key id="397601">SERVER-29834</key>
            <summary>only the active moveChunk on a shard will set the last opTime to wait for writeConcern for</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="esha.maharishi@mongodb.com">Esha Maharishi</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
                        <labels>
                    </labels>
                <created>Fri, 23 Jun 2017 18:07:30 +0000</created>
                <updated>Mon, 30 Oct 2023 23:15:44 +0000</updated>
                            <resolved>Tue, 18 Jul 2017 20:54:08 +0000</resolved>
                                    <version>3.4.5</version>
                    <version>3.5.9</version>
                                    <fixVersion>3.5.11</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1625661" author="xgen-internal-githook" created="Tue, 18 Jul 2017 20:53:55 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;EshaMaharishi&apos;, u&apos;name&apos;: u&apos;Esha Maharishi&apos;, u&apos;email&apos;: u&apos;esha.maharishi@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29834&quot; title=&quot;only the active moveChunk on a shard will set the last opTime to wait for writeConcern for&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29834&quot;&gt;&lt;del&gt;SERVER-29834&lt;/del&gt;&lt;/a&gt; make every moveChunk request set the last opTime to wait for writeConcern for&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8cd40debb70c269710eebdb5bdfc3e70e0b935f9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8cd40debb70c269710eebdb5bdfc3e70e0b935f9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1605472" author="esha.maharishi@10gen.com" created="Fri, 23 Jun 2017 18:14:47 +0000"  >&lt;p&gt;Though the Safe Secondary Reads project in 3.6 will make secondaries filter results (so documents from a donated range should not be returned, even if they have yet to be deleted), this is still an issue on 3.4.&lt;/p&gt;

&lt;p&gt;It&apos;s also relatively simple to fix: the call to &lt;tt&gt;repl::ReplClientInfo::forClient(opCtx-&amp;gt;getClient()).setLastOpToSystemLastOpTime(opCtx);&lt;/tt&gt; should just happen after the moveChunk threads join, so that all of them wait for writeConcern for the correct opTime.&lt;/p&gt;

&lt;p&gt;So, I suggest making the fix on 3.6 as well as 3.4.&lt;/p&gt;</comment>
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