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    <title>MongoDB Jira</title>
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    <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-49180] Make the donor&apos;s dataSync function reserve an OpTime at which to do the &quot;start blocking&quot; write</title>
                <link>https://jira.mongodb.org/browse/SERVER-49180</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Having the blockTimestamp available in the state machine doc simplifies startup recovery, since it allows a node to simply scan all its donor state machine docs on startup to find out which databases it should block for and as of what timestamp.&lt;/p&gt;

&lt;p&gt;To actually put the blockTimestamp into the state machine doc when updating the state machine to &quot;blocking&quot;, the donor must know the blockTimestamp ahead of time.&lt;/p&gt;

&lt;p&gt;To do this, the donor can reserve an OpTime for the write ahead of time using the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/7917051ba59a15fddf70493ffe50ec28289523ae/src/mongo/db/transaction_participant.h#L825&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;OplogSlotReserver&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;This will probably require moving the OplogSlotReserver out of TransactionParticipant into its own file.&lt;/p&gt;

&lt;p&gt;The code review should have sign-off from &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=judah.schvimer&quot; class=&quot;user-hover&quot; rel=&quot;judah.schvimer&quot;&gt;judah.schvimer&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1394879">SERVER-49180</key>
            <summary>Make the donor&apos;s dataSync function reserve an OpTime at which to do the &quot;start blocking&quot; write</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="cheahuychou.mao@mongodb.com">Cheahuychou Mao</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
                        <labels>
                            <label>pm-1791_milestone-A</label>
                    </labels>
                <created>Mon, 29 Jun 2020 20:53:35 +0000</created>
                <updated>Sun, 29 Oct 2023 22:06:20 +0000</updated>
                            <resolved>Wed, 8 Jul 2020 22:15:09 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3276231" author="xgen-internal-githook" created="Wed, 8 Jul 2020 22:13:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Cheahuychou Mao&apos;, &apos;email&apos;: &apos;cheahuychou.mao@mongodb.com&apos;, &apos;username&apos;: &apos;cheahuychou&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-49180&quot; title=&quot;Make the donor&amp;#39;s dataSync function reserve an OpTime at which to do the &amp;quot;start blocking&amp;quot; write&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-49180&quot;&gt;&lt;del&gt;SERVER-49180&lt;/del&gt;&lt;/a&gt; Make the donor&apos;s dataSync function reserve an OpTime at which to do the &quot;start blocking&quot; write&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9f7dbe76058e0300d182f8f548f37dbf5d4ea16b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9f7dbe76058e0300d182f8f548f37dbf5d4ea16b&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1395075">SERVER-49186</issuekey>
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