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    <title>MongoDB Jira</title>
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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-31030] Only transfer session related oplog entries that are majority committed during migration</title>
                <link>https://jira.mongodb.org/browse/SERVER-31030</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="426173">SERVER-31030</key>
            <summary>Only transfer session related oplog entries that are majority committed during migration</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="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                    </labels>
                <created>Mon, 11 Sep 2017 17:42:25 +0000</created>
                <updated>Mon, 30 Oct 2023 23:13:42 +0000</updated>
                            <resolved>Mon, 9 Oct 2017 13:39:07 +0000</resolved>
                                    <version>3.5.12</version>
                                    <fixVersion>3.6.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="1692342" author="xgen-internal-githook" created="Sun, 8 Oct 2017 00:36:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;randolph@10gen.com&apos;, &apos;name&apos;: &apos;Randolph Tan&apos;, &apos;username&apos;: &apos;renctan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31030&quot; title=&quot;Only transfer session related oplog entries that are majority committed during migration&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31030&quot;&gt;&lt;del&gt;SERVER-31030&lt;/del&gt;&lt;/a&gt; Make sure that _getNextSessionMods will only contain oplog entries that are majority committed&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/155db509a8e376211095cec062f7aa5be1b7707e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/155db509a8e376211095cec062f7aa5be1b7707e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1689549" author="xgen-internal-githook" created="Wed, 4 Oct 2017 20:45:13 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;randolph@10gen.com&apos;, &apos;name&apos;: &apos;Randolph Tan&apos;, &apos;username&apos;: &apos;renctan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31030&quot; title=&quot;Only transfer session related oplog entries that are majority committed during migration&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31030&quot;&gt;&lt;del&gt;SERVER-31030&lt;/del&gt;&lt;/a&gt; Use full OpTime instead of just Timestamps to refer to oplog entries&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0ab7000e04e16813c1e1e3f131f02de102ddffba&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0ab7000e04e16813c1e1e3f131f02de102ddffba&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1682431" author="renctan" created="Tue, 26 Sep 2017 19:30:27 +0000"  >&lt;p&gt;The plan:&lt;/p&gt;

&lt;p&gt;1. Change lastWriteTs to lastWriteOpTime&lt;br/&gt;
2. Instead of lazily iterating over config.sessions, iterate through the entire table to get all the last write opTime and store them in sorted order.&lt;br/&gt;
3. Before iterating over the last write opTime and walk through the prevTs chain, wait for opTime to be replicated to majority.&lt;br/&gt;
4. Try to fetch the oplog using the opTime. If the oplog cannot be found, check if it was either rolled back or truncated and fail.&lt;/p&gt;

&lt;p&gt;SessionCatalogMigrationSource::notifyNewWriteTS will need to also apply similar changes.&lt;/p&gt;</comment>
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            <issuekey id="2251202">SERVER-73560</issuekey>
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