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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-45953] Exempt oplog readers from acquiring read tickets</title>
                <link>https://jira.mongodb.org/browse/SERVER-45953</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There are certain operations on the system that depend on the ability to replicate oplog entries in order to make progress.  Today, secondaries reading the oplog on their sync sources can be blocked by read ticket exhaustion, potentially creating deadlocks.  In order to break this deadlock situation, we can exempt oplog read queries from needing to acquire read tickets.&lt;br/&gt;
One good way to determine if a reader is an oplog reader from a downstream node is to use the isReplOplogFetching flag.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1129068">SERVER-45953</key>
            <summary>Exempt oplog readers from acquiring read tickets</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="dianna.hohensee@mongodb.com">Dianna Hohensee</assignee>
                                    <reporter username="milkie@mongodb.com">Eric Milkie</reporter>
                        <labels>
                    </labels>
                <created>Tue, 4 Feb 2020 18:43:26 +0000</created>
                <updated>Sun, 29 Oct 2023 22:12:35 +0000</updated>
                            <resolved>Wed, 3 Jun 2020 17:29:45 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                    <fixVersion>4.4.11</fixVersion>
                    <fixVersion>4.2.18</fixVersion>
                    <fixVersion>4.0.28</fixVersion>
                                    <component>Storage</component>
                                        <votes>1</votes>
                                    <watches>14</watches>
                                                                                                                <comments>
                            <comment id="4274753" author="xgen-internal-githook" created="Tue, 4 Jan 2022 19:29:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Dianna Hohensee&apos;, &apos;email&apos;: &apos;dianna.hohensee@mongodb.com&apos;, &apos;username&apos;: &apos;DiannaHohensee&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45953&quot; title=&quot;Exempt oplog readers from acquiring read tickets&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45953&quot;&gt;&lt;del&gt;SERVER-45953&lt;/del&gt;&lt;/a&gt; Exempt internal replication oplog readers from acquiring read tickets in order to avoid deadlocks&lt;/p&gt;

&lt;p&gt;(cherry picked from commit d1cb83d9199c1a25158d74e47b3aa88b5c33fe8b)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/af1a9dc12adcfa83cc19571cb3faba26eeddac92&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/af1a9dc12adcfa83cc19571cb3faba26eeddac92&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4227710" author="xgen-internal-githook" created="Thu, 2 Dec 2021 18:42:23 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Dianna Hohensee&apos;, &apos;email&apos;: &apos;dianna.hohensee@mongodb.com&apos;, &apos;username&apos;: &apos;DiannaHohensee&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45953&quot; title=&quot;Exempt oplog readers from acquiring read tickets&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45953&quot;&gt;&lt;del&gt;SERVER-45953&lt;/del&gt;&lt;/a&gt; Exempt internal replication oplog readers from acquiring read tickets in order to avoid deadlocks&lt;/p&gt;

&lt;p&gt;(cherry picked from commit d1cb83d9199c1a25158d74e47b3aa88b5c33fe8b)&lt;/p&gt;

&lt;p&gt;Conflicts:&lt;br/&gt;
        src/mongo/db/commands/getmore_cmd.cpp&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1151e6fec016a7abed435b8a9c81cc9a00aea980&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1151e6fec016a7abed435b8a9c81cc9a00aea980&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4187025" author="xgen-internal-githook" created="Sat, 13 Nov 2021 01:54:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Dianna Hohensee&apos;, &apos;email&apos;: &apos;dianna.hohensee@mongodb.com&apos;, &apos;username&apos;: &apos;DiannaHohensee&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45953&quot; title=&quot;Exempt oplog readers from acquiring read tickets&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45953&quot;&gt;&lt;del&gt;SERVER-45953&lt;/del&gt;&lt;/a&gt; Exempt internal replication oplog readers from acquiring read tickets in order to avoid deadlocks&lt;/p&gt;

&lt;p&gt;(cherry picked from commit d1cb83d9199c1a25158d74e47b3aa88b5c33fe8b)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d43191ce6f7f9caa641df374e6d55e6e64073f54&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d43191ce6f7f9caa641df374e6d55e6e64073f54&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3188157" author="xgen-internal-githook" created="Wed, 3 Jun 2020 17:50:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Dianna Hohensee&apos;, &apos;email&apos;: &apos;dianna.hohensee@mongodb.com&apos;, &apos;username&apos;: &apos;DiannaHohensee&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45953&quot; title=&quot;Exempt oplog readers from acquiring read tickets&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45953&quot;&gt;&lt;del&gt;SERVER-45953&lt;/del&gt;&lt;/a&gt; Exempt internal replication oplog readers from acquiring read tickets in order to avoid deadlocks&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d1cb83d9199c1a25158d74e47b3aa88b5c33fe8b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d1cb83d9199c1a25158d74e47b3aa88b5c33fe8b&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1009375">SERVER-44711</issuekey>
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