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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-56335] Increment the number of oplog entries applied by one when recipient completely catches up to donor</title>
                <link>https://jira.mongodb.org/browse/SERVER-56335</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The ReshardingDonorOplogIterator intentionally doesn&apos;t return the op=&apos;n&apos; final resharding oplog entry. Not returning the final resharding oplog entry ensures the recipient, when resuming, would be guaranteed to come across the oplog entry again in its local oplog buffer and realize it had already finished applying all of the oplog entries.&lt;/p&gt;

&lt;p&gt;However, the current behavior leads the number of oplog entries fetched to always be greater than the number of oplog entries applied, even when resharding completes successfully. This is due to how the op=&apos;n&apos; final resharding oplog entries are accounted for in the number of oplog entries fetched, but are not accounted for in the number of oplog entries applied. Incrementing the in&amp;#45;memory counter by 1 for the number of oplog entries applied &lt;a href=&quot;https://github.com/mongodb/mongo/blob/666003777e374d783ed1a450bcd4056d6ea00f95/src/mongo/db/s/resharding/resharding_oplog_applier.cpp#L164-L166&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;when ReshardingOplogApplier::&amp;#95;currentBatchToApply is empty&lt;/a&gt; would correct this discrepancy. &lt;b&gt;The on&amp;#45;disk value for &apos;numEntriesApplied&apos; in the progress&amp;#95;applier collection must not be incremented by 1.&lt;/b&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1691116">SERVER-56335</key>
            <summary>Increment the number of oplog entries applied by one when recipient completely catches up to donor</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="13201">Fixed</resolution>
                                        <assignee username="janna.golden@mongodb.com">Janna Golden</assignee>
                                    <reporter username="max.hirschhorn@mongodb.com">Max Hirschhorn</reporter>
                        <labels>
                            <label>PM-234-M3</label>
                            <label>PM-234-T-autocommits</label>
                    </labels>
                <created>Sun, 25 Apr 2021 22:24:37 +0000</created>
                <updated>Sun, 29 Oct 2023 21:54:32 +0000</updated>
                            <resolved>Tue, 4 May 2021 22:51:26 +0000</resolved>
                                                    <fixVersion>5.0.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3755395" author="xgen-internal-githook" created="Tue, 4 May 2021 21:32:31 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;jannaerin&apos;, &apos;email&apos;: &apos;golden.janna@gmail.com&apos;, &apos;username&apos;: &apos;jannaerin&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56335&quot; title=&quot;Increment the number of oplog entries applied by one when recipient completely catches up to donor&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56335&quot;&gt;&lt;del&gt;SERVER-56335&lt;/del&gt;&lt;/a&gt; Increment the number of oplog entries applied by 1 twhen resharding recipient catches up to donor to account for final oplog entry&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fd0454d592b86062970defb025e2b2c792d110f4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fd0454d592b86062970defb025e2b2c792d110f4&lt;/a&gt;&lt;/p&gt;</comment>
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