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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
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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-40554] The `txn::sendPrepare` utility can return without having destroyed its child AsyncWorkScheduler</title>
                <link>https://jira.mongodb.org/browse/SERVER-40554</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The Transaction Coordinator&apos;s &lt;a href=&quot;https://github.com/mongodb/mongo/blob/408888993045ebf65e05f3fe6070d58580b774f8/src/mongo/db/s/transaction_coordinator_util.h#L94&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;txn::sendPrepare&lt;/tt&gt;&lt;/a&gt; utility &lt;a href=&quot;https://github.com/mongodb/mongo/blob/408888993045ebf65e05f3fe6070d58580b774f8/src/mongo/db/s/transaction_coordinator_util.cpp#L249&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;instantiates&lt;/a&gt; its own child AsyncWorkScheduler in order to be able to cancel just its part of the work without impacting the parent.&lt;/p&gt;

&lt;p&gt;The lifetime of this child scheduler has to be shorter than the signaling of the future returned by &lt;tt&gt;txn::sendPrepare&lt;/tt&gt;, so that the caller can use the signaling of the future for controlling the lifetime of its own objects (in this case the entire TransactionCoordinator).&lt;/p&gt;

&lt;p&gt;The way it is currently implemented, because &lt;tt&gt;prepareScheduler&lt;/tt&gt; is moved into &lt;tt&gt;txn::collect&lt;/tt&gt;&apos;s &lt;a href=&quot;https://github.com/mongodb/mongo/blob/408888993045ebf65e05f3fe6070d58580b774f8/src/mongo/db/s/transaction_coordinator_util.cpp#L264&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;collector lambda&lt;/a&gt;, it will still be alive at the time when the returned future&apos;s chain is signaled.&lt;/p&gt;</description>
                <environment></environment>
        <key id="734686">SERVER-40554</key>
            <summary>The `txn::sendPrepare` utility can return without having destroyed its child AsyncWorkScheduler</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="13201">Fixed</resolution>
                                        <assignee username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                    </labels>
                <created>Tue, 9 Apr 2019 23:18:11 +0000</created>
                <updated>Sun, 29 Oct 2023 22:22:09 +0000</updated>
                            <resolved>Mon, 15 Apr 2019 17:33:24 +0000</resolved>
                                                    <fixVersion>4.1.11</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2213924" author="xgen-internal-githook" created="Mon, 15 Apr 2019 17:33:02 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;kaloian.manassiev@mongodb.com&apos;, &apos;name&apos;: &apos;Kaloian Manassiev&apos;, &apos;username&apos;: &apos;kaloianm&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40554&quot; title=&quot;The `txn::sendPrepare` utility can return without having destroyed its child AsyncWorkScheduler&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40554&quot;&gt;&lt;del&gt;SERVER-40554&lt;/del&gt;&lt;/a&gt; Get rid of &apos;lazy&apos; transaction coordinator destruction&lt;/p&gt;

&lt;p&gt;And also bound the lifetime of `prepareScheduler` to only until the&lt;br/&gt;
collect lambda is signaled.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3275bdb42e57886a671b7af625b9e6b25f6c2e18&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3275bdb42e57886a671b7af625b9e6b25f6c2e18&lt;/a&gt;&lt;/p&gt;</comment>
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