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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-38429] Signal all threads waiting for checking out session on session checkin</title>
                <link>https://jira.mongodb.org/browse/SERVER-38429</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/f74f7a9b8aae393a997dc5575a4959cd5e788451/src/mongo/db/session_catalog.cpp#L90-L92&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;SessionCatalog::checkOutSession()&lt;/tt&gt;&lt;/a&gt; waits until no one has checked it out &lt;b&gt;AND&lt;/b&gt; no one has killed it.&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&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;  margin-top: 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;    opCtx-&amp;gt;waitForConditionOrInterrupt(sri-&amp;gt;availableCondVar, ul, [&amp;amp;sri]() {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;        return !sri-&amp;gt;session.currentOperation() &amp;amp;&amp;amp; !sri-&amp;gt;session.killed();&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   margin-bottom: 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;    });&lt;/span&gt;&lt;/pre&gt;
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			&lt;/tbody&gt;
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&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;While, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f74f7a9b8aae393a997dc5575a4959cd5e788451/src/mongo/db/session_catalog.cpp#L115&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;SessionCatalog::checkOutSessionForKill&lt;/tt&gt;&lt;/a&gt; only waits until no one has checked it out.&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&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;  margin-top: 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;    opCtx-&amp;gt;waitForConditionOrInterrupt(&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;   margin-bottom: 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;        sri-&amp;gt;availableCondVar, ul, [&amp;amp;sri]() { return !sri-&amp;gt;session.currentOperation(); });&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;/table&gt;
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&lt;p/&gt;
&lt;p&gt;When a session checks in, the thread only &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f74f7a9b8aae393a997dc5575a4959cd5e788451/src/mongo/db/session_catalog.cpp#L181&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;notifies the next one&lt;/a&gt;:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&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;  margin-top: 10px;   margin-bottom: 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;    sri-&amp;gt;availableCondVar.notify_one();&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;If both a normal checkout and a checkOutForKill are waiting for the session checkin, however the normal checkout is the first in the queue, it wakes up, realizes the session is killed, and sleeps again. checkOutForKill won&apos;t have a chance to wake up. Changing the &lt;tt&gt;notify_one&lt;/tt&gt; to &lt;tt&gt;notify_all&lt;/tt&gt; will fix this problem.&lt;/p&gt;</description>
                <environment></environment>
        <key id="645166">SERVER-38429</key>
            <summary>Signal all threads waiting for checking out session on session checkin</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="siyuan.zhou@mongodb.com">Siyuan Zhou</assignee>
                                    <reporter username="siyuan.zhou@mongodb.com">Siyuan Zhou</reporter>
                        <labels>
                    </labels>
                <created>Wed, 5 Dec 2018 22:05:55 +0000</created>
                <updated>Sun, 29 Oct 2023 22:26:04 +0000</updated>
                            <resolved>Thu, 20 Dec 2018 02:22:22 +0000</resolved>
                                                    <fixVersion>4.1.7</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2096725" author="xgen-internal-githook" created="Thu, 20 Dec 2018 03:23:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;benety&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;name&apos;: &apos;Benety Goh&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38429&quot; title=&quot;Signal all threads waiting for checking out session on session checkin&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38429&quot;&gt;&lt;del&gt;SERVER-38429&lt;/del&gt;&lt;/a&gt; fix lint&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/424946d39691708bad0b0719ce4e67138b747c5e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/424946d39691708bad0b0719ce4e67138b747c5e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2096690" author="xgen-internal-githook" created="Thu, 20 Dec 2018 02:18:32 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;visualzhou&apos;, &apos;email&apos;: &apos;siyuan.zhou@mongodb.com&apos;, &apos;name&apos;: &apos;Siyuan Zhou&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38429&quot; title=&quot;Signal all threads waiting for checking out session on session checkin&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38429&quot;&gt;&lt;del&gt;SERVER-38429&lt;/del&gt;&lt;/a&gt; Signal all threads waiting for checking out session on session checkin&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b1067e9c54c266c8a98af62e0cc02b5372ae5d40&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b1067e9c54c266c8a98af62e0cc02b5372ae5d40&lt;/a&gt;&lt;/p&gt;</comment>
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