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    <title>MongoDB Jira</title>
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    <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-31912] waitUntilDurable() should use its own WT_SESSION, not one from the cache</title>
                <link>https://jira.mongodb.org/browse/SERVER-31912</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;waitUntilDurable() only needs a session to call log_flush() and checkpoint().  Since it uses no cursors, it should be fine to have it simply use one long-lived session object for this, rather than getting a session out of the cache every time.&lt;br/&gt;
The benefit for this will be to reduce contention on the mutex that protects the session cache, as it must be locked every time a session is taken out of the cache and every time a session is returned to the cache.&lt;/p&gt;</description>
                <environment></environment>
        <key id="457144">SERVER-31912</key>
            <summary>waitUntilDurable() should use its own WT_SESSION, not one from the cache</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="milkie@mongodb.com">Eric Milkie</assignee>
                                    <reporter username="milkie@mongodb.com">Eric Milkie</reporter>
                        <labels>
                    </labels>
                <created>Fri, 10 Nov 2017 16:54:15 +0000</created>
                <updated>Mon, 30 Oct 2023 23:10:37 +0000</updated>
                            <resolved>Mon, 13 Nov 2017 18:04:19 +0000</resolved>
                                                    <fixVersion>3.6.0-rc4</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1724267" author="xgen-internal-githook" created="Mon, 13 Nov 2017 17:58:34 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Eric Milkie&apos;, &apos;username&apos;: &apos;milkie&apos;, &apos;email&apos;: &apos;milkie@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31912&quot; title=&quot;waitUntilDurable() should use its own WT_SESSION, not one from the cache&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31912&quot;&gt;&lt;del&gt;SERVER-31912&lt;/del&gt;&lt;/a&gt; use a private WT_SESSION in waitUntilDurable instead of one from the session cache&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9a1f209aa8e47587af6ad81e991b101abea1f677&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9a1f209aa8e47587af6ad81e991b101abea1f677&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1722795" author="milkie" created="Fri, 10 Nov 2017 18:05:41 +0000"  >&lt;p&gt;Ah I see, there is another code path in that function that uses a session and is not mutex protected. However, I&apos;m not interested in optimizing that codepath, so it will continue to use a cached session for its work.&lt;/p&gt;</comment>
                            <comment id="1722739" author="milkie" created="Fri, 10 Nov 2017 17:07:17 +0000"  >&lt;p&gt;They do, but the place where the function makes calls on the session is mutex protected, and threads that block on the mutex are short-circuited when they finally acquire it.&lt;/p&gt;</comment>
                            <comment id="1722732" author="schwerin" created="Fri, 10 Nov 2017 17:02:53 +0000"  >&lt;p&gt;Do you mean one session used by all the threads that simultaneously call waitForDurable? A bunch of threads call that, right?&lt;/p&gt;</comment>
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