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    <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-50063] Oplog fetcher can return network errors or CallbackCanceled when shutting down</title>
                <link>https://jira.mongodb.org/browse/SERVER-50063</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;What happened was that the test &lt;a href=&quot;https://github.com/mongodb/mongo/blob/803d63f2a918e2b002880992af229affcb08a176/src/mongo/db/repl/oplog_fetcher_test.cpp#L635-L637&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;OplogFetcherReturnsCallbackCanceledIfShutdownAfterRunQueryScheduled&lt;/tt&gt; expects failpoint &quot;hangAfterOplogFetcherCallbackScheduled&quot; is always on&lt;/a&gt; to make sure &lt;a href=&quot;https://github.com/mongodb/mongo/blob/803d63f2a918e2b002880992af229affcb08a176/src/mongo/db/repl/oplog_fetcher_test.cpp#L645&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;oplogFetcher-&amp;gt;shutdown()&lt;/a&gt; is run &lt;a href=&quot;https://github.com/mongodb/mongo/blob/803d63f2a918e2b002880992af229affcb08a176/src/mongo/db/repl/oplog_fetcher.cpp#L347-L373&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;before the oplog fetcher tries to connect and init the cursor&lt;/a&gt;. But unfortunately, in &lt;tt&gt;getOplogFetcherAfterConnectionCreated&lt;/tt&gt;, we &lt;a href=&quot;https://github.com/mongodb/mongo/blob/803d63f2a918e2b002880992af229affcb08a176/src/mongo/db/repl/oplog_fetcher_test.cpp#L434&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;disable the same failpoint&lt;/a&gt;, messing up with the expectation of the test.&lt;/p&gt;

&lt;p&gt;As part of the oplog fetcher shutdown, we also force the DBClientConnection to close (&lt;a href=&quot;https://github.com/mongodb/mongo/blob/803d63f2a918e2b002880992af229affcb08a176/src/mongo/db/repl/oplog_fetcher.cpp#L238&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;shutdownAndDisallowReconnect&lt;/tt&gt;&lt;/a&gt;). So if the above &lt;tt&gt;shutdown&lt;/tt&gt; is run while the oplog fetcher is doing network operations, the oplog fetcher could fail with network errors instead of &lt;tt&gt;CallbackCanceled&lt;/tt&gt; as &lt;a href=&quot;https://github.com/mongodb/mongo/blob/803d63f2a918e2b002880992af229affcb08a176/src/mongo/db/repl/oplog_fetcher_test.cpp#L652&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;expected in the unit test&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;I am not sure if this is a &quot;bug&quot; and if the error code matters while the oplog fetcher is shutting down. But it might be a good idea to consolidate error code to  &lt;tt&gt;CallbackCanceled&lt;/tt&gt; in &lt;a href=&quot;https://github.com/mongodb/mongo/blob/803d63f2a918e2b002880992af229affcb08a176/src/mongo/db/repl/oplog_fetcher.cpp#L314&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;_finishCallback&lt;/tt&gt;&lt;/a&gt; if &lt;tt&gt;_isShuttingDown()&lt;/tt&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1425768">SERVER-50063</key>
            <summary>Oplog fetcher can return network errors or CallbackCanceled when shutting down</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="lingzhi.deng@mongodb.com">Lingzhi Deng</assignee>
                                    <reporter username="lingzhi.deng@mongodb.com">Lingzhi Deng</reporter>
                        <labels>
                    </labels>
                <created>Fri, 31 Jul 2020 21:18:28 +0000</created>
                <updated>Sun, 29 Oct 2023 22:04:53 +0000</updated>
                            <resolved>Mon, 10 Aug 2020 16:51:13 +0000</resolved>
                                                    <fixVersion>4.4.1</fixVersion>
                    <fixVersion>4.7.0</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3355993" author="xgen-internal-githook" created="Mon, 24 Aug 2020 18:31:23 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Lingzhi Deng&apos;, &apos;email&apos;: &apos;lingzhi.deng@mongodb.com&apos;, &apos;username&apos;: &apos;ldennis&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-50063&quot; title=&quot;Oplog fetcher can return network errors or CallbackCanceled when shutting down&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-50063&quot;&gt;&lt;del&gt;SERVER-50063&lt;/del&gt;&lt;/a&gt;: Consolidate OplogFetcher return code to CallbackCanceled when shutting down&lt;/p&gt;

&lt;p&gt;(cherry picked from commit a12299145c35b0cebea60f303613f85472b2915f)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e161282063c7ab698982dba88e5514dc9faf0cc9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e161282063c7ab698982dba88e5514dc9faf0cc9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3330994" author="xgen-internal-githook" created="Mon, 10 Aug 2020 16:41:24 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Lingzhi Deng&apos;, &apos;email&apos;: &apos;lingzhi.deng@mongodb.com&apos;, &apos;username&apos;: &apos;ldennis&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-50063&quot; title=&quot;Oplog fetcher can return network errors or CallbackCanceled when shutting down&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-50063&quot;&gt;&lt;del&gt;SERVER-50063&lt;/del&gt;&lt;/a&gt;: Consolidate OplogFetcher return code to CallbackCanceled when shutting down&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a12299145c35b0cebea60f303613f85472b2915f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a12299145c35b0cebea60f303613f85472b2915f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3316547" author="lingzhi.deng" created="Fri, 31 Jul 2020 21:41:33 +0000"  >&lt;p&gt;We should either&lt;br/&gt;
1. Fix the test (either rewrite it to have the failpoint always set or allow network errors) OR&lt;br/&gt;
2. Consolidate error code to CallbackCanceled when shutting down.&lt;br/&gt;
CC &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=samy.lanka&quot; class=&quot;user-hover&quot; rel=&quot;samy.lanka&quot;&gt;samy.lanka&lt;/a&gt;&lt;/p&gt;</comment>
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