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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-45626] Consistent Oplog Locking Rules</title>
                <link>https://jira.mongodb.org/browse/SERVER-45626</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In principle we should only need the Global IS/IX lock to read/write the oplog. However, see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44906&quot; title=&quot;Rollback should take global write lock while truncating oplog&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44906&quot;&gt;SERVER-44906&lt;/a&gt;, we&apos;re inconsistent. Furthermore, there are cases our code requires a DB and Collection lock in order to get a Collection pointer to the oplog, although this is not fundamentally necessary.&lt;/p&gt;

&lt;p&gt;Inconsistent locking invites mistakes: deadlocks, race conditions, and unnecessary waiting.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="1088606">SERVER-45626</key>
            <summary>Consistent Oplog Locking Rules</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="dbeng-pm-bot">PM Bot</reporter>
                        <labels>
                            <label>former-quick-wins</label>
                    </labels>
                <created>Mon, 13 Jan 2020 21:35:33 +0000</created>
                <updated>Sun, 29 Oct 2023 22:13:09 +0000</updated>
                            <resolved>Fri, 13 Mar 2020 18:26:06 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                    <fixVersion>4.4.2</fixVersion>
                                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="3393086" author="xgen-internal-githook" created="Mon, 14 Sep 2020 19:28:31 +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-45626&quot; title=&quot;Consistent Oplog Locking Rules&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45626&quot;&gt;&lt;del&gt;SERVER-45626&lt;/del&gt;&lt;/a&gt;: Introduce AutoGetOplog for consistent oplog locking rules &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46930&quot; title=&quot;AutoGetOplog doesn&amp;#39;t acquire collection IX lock correctly for non-document-locking engines&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46930&quot;&gt;&lt;del&gt;SERVER-46930&lt;/del&gt;&lt;/a&gt;: Fix AutoGetOplog for non-document-locking storage engines &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47959&quot; title=&quot;Retry JournalFlusher oplog reads on WriteConflictExceptions caused by concurrent {full:true} validate command on the oplog collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47959&quot;&gt;&lt;del&gt;SERVER-47959&lt;/del&gt;&lt;/a&gt; JournalFlusher will retry oplog reads on WriteConflictExceptions caused by a concurrent &lt;/p&gt;
{full:true}
&lt;p&gt; validate command on the oplog collection&lt;/p&gt;

&lt;p&gt;(cherry picked from commit c15e8ae74071482d69179c7e5e5e6bdc882d2beb)&lt;br/&gt;
(cherry picked from commit 4c4cd897f09a85441ad60058b42ea1149b65d7de)&lt;br/&gt;
(cherry picked from commit dcc42b3db40ecc1cb3ca278d9dcc2208a6c7734a)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/503dce2ce6465116cd05d04e4ea88f837e406e8d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/503dce2ce6465116cd05d04e4ea88f837e406e8d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3392095" author="tess.avitabile" created="Mon, 14 Sep 2020 13:34:46 +0000"  >&lt;p&gt;Sounds good to me!&lt;/p&gt;</comment>
                            <comment id="3389979" author="lingzhi.deng" created="Fri, 11 Sep 2020 21:39:24 +0000"  >&lt;p&gt;Ah I see. In that case, yes, we can schedule a backport I guess. Feel free to request one and we can put it in the execution sprint then. CC &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=tess.avitabile&quot; class=&quot;user-hover&quot; rel=&quot;tess.avitabile&quot;&gt;tess.avitabile&lt;/a&gt; any objections?&lt;/p&gt;</comment>
                            <comment id="3388927" author="louis.williams" created="Fri, 11 Sep 2020 20:31:49 +0000"  >&lt;p&gt;Yes, &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48452&quot; title=&quot;Internal readers should default to reading without a timestamp&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48452&quot;&gt;&lt;del&gt;SERVER-48452&lt;/del&gt;&lt;/a&gt; fixes the bug underlying &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-49781&quot; title=&quot;Setting lastApplied before startup recovery has finished causes race with reconstructing prepared transactions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-49781&quot;&gt;&lt;del&gt;SERVER-49781&lt;/del&gt;&lt;/a&gt; (present in 4.4). That is: internal operations may unexpectedly read at timestamps, and this can lead to crashing.&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;Because AutoGetOplog eliminated unnecessary callsites of AutoGetCollectionForRead for oplog I guess&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;Correct.&lt;/p&gt;

&lt;p&gt;Your commit landed only a week after the 4.4 branch (on Mar 4), so it seems possible that this isn&apos;t extremly risky to put into 4.4.&lt;/p&gt;</comment>
                            <comment id="3388793" author="lingzhi.deng" created="Fri, 11 Sep 2020 20:23:40 +0000"  >&lt;p&gt;Why does &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48452&quot; title=&quot;Internal readers should default to reading without a timestamp&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48452&quot;&gt;&lt;del&gt;SERVER-48452&lt;/del&gt;&lt;/a&gt; depends on this? Because AutoGetOplog eliminated unnecessary callsites of AutoGetCollectionForRead for oplog I guess? Does &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48452&quot; title=&quot;Internal readers should default to reading without a timestamp&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48452&quot;&gt;&lt;del&gt;SERVER-48452&lt;/del&gt;&lt;/a&gt; fix a bug in 4.4? Otherwise backporting this (and we also need &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47959&quot; title=&quot;Retry JournalFlusher oplog reads on WriteConflictExceptions caused by concurrent {full:true} validate command on the oplog collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47959&quot;&gt;&lt;del&gt;SERVER-47959&lt;/del&gt;&lt;/a&gt;) seems to come with some risks of destabilizing the 4.4 branch. &lt;/p&gt;</comment>
                            <comment id="3388616" author="louis.williams" created="Fri, 11 Sep 2020 20:09:31 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=lingzhi.deng&quot; class=&quot;user-hover&quot; rel=&quot;lingzhi.deng&quot;&gt;lingzhi.deng&lt;/a&gt; I&apos;m trying to backport &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48452&quot; title=&quot;Internal readers should default to reading without a timestamp&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48452&quot;&gt;&lt;del&gt;SERVER-48452&lt;/del&gt;&lt;/a&gt; to 4.4, but I&apos;m realizing that it depends on this AutoGetOplog change. How realistic would it be to backport would this to 4.4?&lt;/p&gt;</comment>
                            <comment id="2979061" author="xgen-internal-githook" created="Fri, 13 Mar 2020 17:21:16 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;ldennis&apos;, &apos;name&apos;: &apos;Lingzhi Deng&apos;, &apos;email&apos;: &apos;lingzhi.deng@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45626&quot; title=&quot;Consistent Oplog Locking Rules&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45626&quot;&gt;&lt;del&gt;SERVER-45626&lt;/del&gt;&lt;/a&gt;: Introduce AutoGetOplog for consistent oplog locking rules&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c15e8ae74071482d69179c7e5e5e6bdc882d2beb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c15e8ae74071482d69179c7e5e5e6bdc882d2beb&lt;/a&gt;&lt;/p&gt;</comment>
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