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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <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-26704] Refactor DataReplicator::getLatestOplogEntry() to use _scheduleLastOplogEntryFetcher_inlock()</title>
                <link>https://jira.mongodb.org/browse/SERVER-26704</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently getLatestOplogEntry is synchronous and its callback handle is not held onto and thus not cancellable. Refactoring it would make it cancellable.&lt;/p&gt;</description>
                <environment></environment>
        <key id="325395">SERVER-26704</key>
            <summary>Refactor DataReplicator::getLatestOplogEntry() to use _scheduleLastOplogEntryFetcher_inlock()</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="9">Done</resolution>
                                        <assignee username="benety.goh@mongodb.com">Benety Goh</assignee>
                                    <reporter username="judah.schvimer@mongodb.com">Judah Schvimer</reporter>
                        <labels>
                    </labels>
                <created>Wed, 19 Oct 2016 22:12:44 +0000</created>
                <updated>Wed, 5 Apr 2017 16:44:10 +0000</updated>
                            <resolved>Tue, 6 Dec 2016 19:54:11 +0000</resolved>
                                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1450602" author="benety.goh" created="Tue, 6 Dec 2016 19:54:11 +0000"  >&lt;p&gt;This function was removed as part of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27052&quot; title=&quot;Add asynchronous operation support to DataReplicator&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27052&quot;&gt;&lt;del&gt;SERVER-27052&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1415918" author="scotthernandez" created="Mon, 24 Oct 2016 17:49:43 +0000"  >&lt;p&gt;I&apos;m not sure what was discussed in person but simply replacing getLatestOplogEntry with a version that does _scheduleLastOplogEntryFetcher_inlock and waits, would be a drop-in replacement without needing to changing _doInitialSync (or really _runInitialSyncAttempt_inlock) in any way, and would be cancelable (at DR shutdown) and more testable.&lt;/p&gt;</comment>
                            <comment id="1415891" author="judah.schvimer" created="Mon, 24 Oct 2016 17:25:44 +0000"  >&lt;p&gt;Per my discussion with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=benety.goh&quot; class=&quot;user-hover&quot; rel=&quot;benety.goh&quot;&gt;benety.goh&lt;/a&gt;, I think the best solution would be to make it completely asynchronous with _scheduleLastOplogEntryFetcher_inlock(). This will make the code slightly more confusing because it breaks up the _doInitialSync function considerably, but will be best for testing and safest.&lt;/p&gt;</comment>
                            <comment id="1415763" author="benety.goh" created="Mon, 24 Oct 2016 15:50:12 +0000"  >&lt;p&gt;In either case, we are lacking test coverage for the code that fetches the latest oplog entry. In 3.4, there&apos;s no way to cancel/interrupt this operation because the task executor is shutdown after the DataReplicator is destroyed.&lt;/p&gt;</comment>
                            <comment id="1415741" author="judah.schvimer" created="Mon, 24 Oct 2016 15:44:42 +0000"  >&lt;p&gt;We definitely could and I think it would be just as good as the TaskExecutor version, but the TaskExecutor version already exists so it might be easier just to use that one. &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=benety.goh&quot; class=&quot;user-hover&quot; rel=&quot;benety.goh&quot;&gt;benety.goh&lt;/a&gt;, do you have any thoughts on this?&lt;/p&gt;</comment>
                            <comment id="1413258" author="schwerin" created="Wed, 19 Oct 2016 23:09:05 +0000"  >&lt;p&gt;Could we change its implementation to not use task executor if it&apos;s synchronous?&lt;/p&gt;</comment>
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            <issuekey id="332102">SERVER-27052</issuekey>
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