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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-44939] Allow data replication across config versions</title>
                <link>https://jira.mongodb.org/browse/SERVER-44939</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Safe Reconfig requires data replication across config versions for liveness reasons.&lt;/p&gt;

&lt;p&gt;Currently, we &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a29cb7d084afa62772776fc2b58efb1df91c535f/src/mongo/db/repl/topology_coordinator.cpp#L2605-L2610&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;do not sync from a node that has a different config version&lt;/a&gt;. The oplog fetcher &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a29cb7d084afa62772776fc2b58efb1df91c535f/src/mongo/db/repl/oplog_fetcher.cpp#L512-L513&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;checks&lt;/a&gt; if it should stop fetching from the sync source (after it has fetched the first batch).&lt;/p&gt;

&lt;p&gt;&lt;tt&gt;shouldStopFetching&lt;/tt&gt; calls &lt;tt&gt;replCoord-&amp;gt;shouldChangeSyncSource&lt;/tt&gt; which finally calls &lt;tt&gt;topCoord-&amp;gt;shouldChangeSyncSource&lt;/tt&gt;. Here, we check for the various reasons we would want to change sync source (i.e. not being in the same config).&lt;/p&gt;</description>
                <environment></environment>
        <key id="1034530">SERVER-44939</key>
            <summary>Allow data replication across config versions</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="pavithra.vetriselvan@mongodb.com">Pavithra Vetriselvan</assignee>
                                    <reporter username="siyuan.zhou@mongodb.com">Siyuan Zhou</reporter>
                        <labels>
                    </labels>
                <created>Wed, 4 Dec 2019 00:01:26 +0000</created>
                <updated>Sun, 29 Oct 2023 22:14:27 +0000</updated>
                            <resolved>Thu, 30 Jan 2020 15:44:50 +0000</resolved>
                                                    <fixVersion>4.3.4</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="2771829" author="xgen-internal-githook" created="Thu, 30 Jan 2020 01:16:53 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;pvselvan&apos;, &apos;name&apos;: &apos;Pavithra Vetriselvan&apos;, &apos;email&apos;: &apos;pavithra.vetriselvan@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44939&quot; title=&quot;Allow data replication across config versions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44939&quot;&gt;&lt;del&gt;SERVER-44939&lt;/del&gt;&lt;/a&gt; allow replication across config versions&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/101eb1694568df1ff086a460cc6c511eacc05860&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/101eb1694568df1ff086a460cc6c511eacc05860&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1049552">SERVER-45083</issuekey>
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