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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-41291] Oldest timestamp not always advanced with --enableMajorityReadConcern=false, on secondary nodes</title>
                <link>https://jira.mongodb.org/browse/SERVER-41291</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Run the following against a replica set with majority read concern disabled. It generates bursts of updates spaced 15 seconds apart.&lt;/p&gt;
&lt;p/&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    for (var i = 0; i &amp;lt; 1000; i++)&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        db.c.insert({x: 0})&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
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&lt;p/&gt;
&lt;p&gt;FTDC shows the following:&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/217843/217843_oldest.png&quot; width=&quot;100%&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;During the bursts we are executing a couple hundred batches per second, but the oldest timestamp is not advanced on every batch, and in fact may not be advanced for minutes at a time. This can cause a large amount of data to be pinned in cache.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="775236">SERVER-41291</key>
            <summary>Oldest timestamp not always advanced with --enableMajorityReadConcern=false, on secondary nodes</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="milkie@mongodb.com">Eric Milkie</assignee>
                                    <reporter username="bruce.lucas@mongodb.com">Bruce Lucas</reporter>
                        <labels>
                    </labels>
                <created>Thu, 23 May 2019 16:28:53 +0000</created>
                <updated>Sun, 29 Oct 2023 22:20:45 +0000</updated>
                            <resolved>Fri, 24 May 2019 19:53:51 +0000</resolved>
                                    <version>4.0.5</version>
                    <version>4.0.9</version>
                                    <fixVersion>4.0.10</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>13</watches>
                                                                                                                <comments>
                            <comment id="2259712" author="xgen-internal-githook" created="Fri, 24 May 2019 19:50:20 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Eric Milkie&apos;, &apos;email&apos;: &apos;milkie@10gen.com&apos;, &apos;username&apos;: &apos;milkie&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41291&quot; title=&quot;Oldest timestamp not always advanced with --enableMajorityReadConcern=false, on secondary nodes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41291&quot;&gt;&lt;del&gt;SERVER-41291&lt;/del&gt;&lt;/a&gt; ensure advancing of oldest timestamp in enableMajorityReadConcern=false mode on secondary nodes&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c389e7f69f637f7a1ac3cc9fae843b635f20b766&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c389e7f69f637f7a1ac3cc9fae843b635f20b766&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2259616" author="milkie" created="Fri, 24 May 2019 18:44:10 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37897&quot; title=&quot;Disable table logging for data files when enableMajorityReadConcern=false&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37897&quot;&gt;&lt;del&gt;SERVER-37897&lt;/del&gt;&lt;/a&gt; effectively changed the code here so that the bug is no longer present in 4.1.&lt;/p&gt;</comment>
                            <comment id="2259585" author="milkie" created="Fri, 24 May 2019 18:27:56 +0000"  >&lt;p&gt;The problem appears to be a race between setting the oplog read timestamp in &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.0.5/src/mongo/db/storage/wiredtiger/wiredtiger_record_store.cpp#L1843&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;oplogDiskLocRegister&lt;/a&gt; and the one in the WTOplogJournalThread (oplog visibility thread) &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.0.5/src/mongo/db/storage/wiredtiger/wiredtiger_oplog_manager.cpp#L242&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;.&lt;br/&gt;
The code in the loop assumes that it is the only thing moving the oplog read timestamp forward.&lt;/p&gt;</comment>
                            <comment id="2258435" author="bruce.lucas@10gen.com" created="Thu, 23 May 2019 20:28:59 +0000"  >&lt;p&gt;By the way, a note on running the repro: the chart above is from a 2-node replica set. The behavior reproduces on a 3-node replica set as well, but it seems to be a bit more complicated - maybe one secondary exhibits the behavior more than the other, and maybe they tended not to both exhibit it all the time. So from an analysis standpoint it might be simpler to start with a 2-node replica set.&lt;/p&gt;</comment>
                            <comment id="2258092" author="bruce.lucas@10gen.com" created="Thu, 23 May 2019 16:51:55 +0000"  >&lt;p&gt;This does not seem to reproduce on 4.1.11 nor 3.6.12 (for this particular reproducer).&lt;/p&gt;</comment>
                    </comments>
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                                        <issuelink>
            <issuekey id="510422">SERVER-33846</issuekey>
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