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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-5326] Restructure MMAPV1 journaling to not require the global read lock</title>
                <link>https://jira.mongodb.org/browse/SERVER-5326</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The current journaling implementation in MMAPV1 requires a global read lock on the mongod instance, to ensure that it can read consistent versions of all database private views when writing the journal.  This makes deadlock avoidance in commitIfNeeded() somewhat hairy, and could become a performance bottleneck.&lt;/p&gt;

&lt;p&gt;Instead, mongod should only lock one database at a time (plus the &quot;local&quot; database, perhaps) when writing to the journal from threads other than the durability thread (and optionally also the durability thread).&lt;/p&gt;

&lt;p&gt;For performance, in MMAPV1 only any extremely long running single document update can block other operations if the journal thread  is waiting for its completion.  &lt;/p&gt;

&lt;p&gt;Best solution is to &lt;b&gt;avoid any updates that update many thousands of fields in a document in a single update&lt;/b&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="33152">SERVER-5326</key>
            <summary>Restructure MMAPV1 journaling to not require the global read lock</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="schwerin@mongodb.com">Andy Schwerin</reporter>
                        <labels>
                    </labels>
                <created>Fri, 16 Mar 2012 18:29:43 +0000</created>
                <updated>Wed, 31 Aug 2016 17:51:58 +0000</updated>
                            <resolved>Tue, 17 Nov 2015 21:48:09 +0000</resolved>
                                    <version>2.1.1</version>
                                                    <component>Concurrency</component>
                    <component>Storage</component>
                                        <votes>6</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="1017097" author="asya" created="Fri, 28 Aug 2015 15:49:01 +0000"  >&lt;p&gt;This issue does not apply to WiredTiger where journaling mechanics are different and reads don&apos;t block other operations and writes also work significantly differently.  Due to that, it&apos;s not clear that this mechanism is in the critical path going forward.  Adjusted description accordingly.   Will change title as well to make it clear.&lt;/p&gt;</comment>
                            <comment id="428649" author="schwerin" created="Thu, 19 Sep 2013 19:01:44 +0000"  >&lt;p&gt;No, it slipped, I&apos;m afraid.&lt;/p&gt;</comment>
                            <comment id="428633" author="asya" created="Thu, 19 Sep 2013 18:53:36 +0000"  >&lt;p&gt;Is this on the radar for 2.6?&lt;/p&gt;</comment>
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            <issuekey id="89200">SERVER-10747</issuekey>
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