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    <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-80401] Natural Order Resharding Pipeline Can Attempt to Write Empty Batch</title>
                <link>https://jira.mongodb.org/browse/SERVER-80401</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The logic to write a batch in &lt;a href=&quot;https://github.com/10gen/mongo/blob/708bd70c8f7000ea325845286f4b97fb8227d45c/src/mongo/db/s/resharding/resharding_collection_cloner.cpp#L720&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;ReshardingCollectionCloner::doOneBatch&lt;/a&gt; was &lt;a href=&quot;https://github.com/10gen/mongo/commit/b9e0ed7bcf87a4b9388f958e62e92791e4add0d3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;recently&lt;/a&gt; split into another &lt;a href=&quot;https://github.com/10gen/mongo/blob/708bd70c8f7000ea325845286f4b97fb8227d45c/src/mongo/db/s/resharding/resharding_collection_cloner.cpp#L740&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;writeOneBatch&lt;/a&gt; function, which is called from the path using the &lt;a href=&quot;https://github.com/10gen/mongo/blob/708bd70c8f7000ea325845286f4b97fb8227d45c/src/mongo/db/s/resharding/resharding_collection_cloner.cpp#L664&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;natural order pipeline&lt;/a&gt;. However, the natural order pipeline does not guard against attempt to write a batch with size 0, whereas the &lt;a href=&quot;https://github.com/10gen/mongo/blob/708bd70c8f7000ea325845286f4b97fb8227d45c/src/mongo/db/s/resharding/resharding_collection_cloner.cpp#L732-L736&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;original code path does&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;It&apos;s possible if the batch returned by the cursor is size 0, then we eventually call &lt;a href=&quot;https://github.com/10gen/mongo/blob/708bd70c8f7000ea325845286f4b97fb8227d45c/src/mongo/db/s/resharding/resharding_data_copy_util.cpp#L409&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;getNextOpTimes()&lt;/a&gt; with count = 0, which will trigger an &lt;a href=&quot;https://github.com/10gen/mongo/blob/708bd70c8f7000ea325845286f4b97fb8227d45c/src/mongo/db/vector_clock_mutable.cpp#L82&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;invariant&lt;/a&gt; in _advanceComponentTimeByTicks when we try to increment the vector clock by 0 ticks. This is seen in BF-29741.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2425876">SERVER-80401</key>
            <summary>Natural Order Resharding Pipeline Can Attempt to Write Empty Batch</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="13203">Gone away</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="brett.nawrocki@mongodb.com">Brett Nawrocki</reporter>
                        <labels>
                    </labels>
                <created>Thu, 24 Aug 2023 19:34:01 +0000</created>
                <updated>Fri, 27 Oct 2023 20:44:39 +0000</updated>
                            <resolved>Tue, 29 Aug 2023 22:58:16 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5667437" author="JIRAUSER1272726" created="Tue, 29 Aug 2023 22:58:16 +0000"  >&lt;p&gt;This case should never happen if resharding doesn&apos;t switch cloner in between, which is fixed in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-80408&quot; title=&quot;Decide which resharding collection cloner to use at the beginning&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80408&quot;&gt;&lt;del&gt;SERVER-80408&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
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