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    <title>MongoDB Jira</title>
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    <description>This file is an XML representation of an issue</description>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-33697] Provide sanity check on number of cached sessions</title>
                <link>https://jira.mongodb.org/browse/SERVER-33697</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Driver or application errors can result in an unbounded number of cached sessions, and that can result in performance degradation and eventually OOM. It would be useful to provide a sanity check, say at 1 M cached sessions, and warn or refuse further sessions when it is exceeded.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Fix Implementation&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;The commands that add new sessions to the cache are&#160;start_session_command, refresh_sessions_command and refresh_sessions_command_internal. These commands will now return false when the cache is full. The maximum number of sessions can be configured through an optional argument to the mongod command (maxSessions) and will default to 1M.&#160;LogicalSessionCacheImpl::_addToCache &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/logical_session_cache_impl.cpp#L102&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/master/src/mongo/db/logical_session_cache_impl.cpp#L102 &lt;/a&gt;&#160;and LogicalSessionCacheImpl::startSession will now return a Status instead of void.&lt;/p&gt;</description>
                <environment></environment>
        <key id="506546">SERVER-33697</key>
            <summary>Provide sanity check on number of cached sessions</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="cheahuychou.mao@mongodb.com">Cheahuychou Mao</assignee>
                                    <reporter username="bruce.lucas@mongodb.com">Bruce Lucas</reporter>
                        <labels>
                            <label>ShardingTechDebt</label>
                    </labels>
                <created>Tue, 6 Mar 2018 17:56:05 +0000</created>
                <updated>Sun, 29 Oct 2023 22:34:05 +0000</updated>
                            <resolved>Mon, 9 Jul 2018 14:37:06 +0000</resolved>
                                                    <fixVersion>3.6.7</fixVersion>
                    <fixVersion>4.0.1</fixVersion>
                    <fixVersion>4.1.1</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="1944158" author="xgen-internal-githook" created="Wed, 11 Jul 2018 13:24:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;cheahuychou&apos;, &apos;name&apos;: &apos;Cheahuychou Mao&apos;, &apos;email&apos;: &apos;cheahuychou.mao@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33697&quot; title=&quot;Provide sanity check on number of cached sessions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33697&quot;&gt;&lt;del&gt;SERVER-33697&lt;/del&gt;&lt;/a&gt; Provide sanity check on the number of cached sessions&lt;/p&gt;

&lt;p&gt;(cherry picked from commit ffbaee1a4dcb47a307986cb696807fe979f4a39d)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/def12b4a903bcf0dea6211f25ccbc5e0613fe5b2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/def12b4a903bcf0dea6211f25ccbc5e0613fe5b2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1942109" author="xgen-internal-githook" created="Mon, 9 Jul 2018 16:49:35 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;cheahuychou&apos;, &apos;name&apos;: &apos;Cheahuychou Mao&apos;, &apos;email&apos;: &apos;cheahuychou.mao@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33697&quot; title=&quot;Provide sanity check on number of cached sessions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33697&quot;&gt;&lt;del&gt;SERVER-33697&lt;/del&gt;&lt;/a&gt; Provide sanity check on the number of cached sessions&lt;/p&gt;

&lt;p&gt;(cherry picked from commit ffbaee1a4dcb47a307986cb696807fe979f4a39d)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4f26a981c06b39e44f10d5a8a567e9e2e76baf0b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4f26a981c06b39e44f10d5a8a567e9e2e76baf0b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1941853" author="xgen-internal-githook" created="Mon, 9 Jul 2018 14:32:19 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;cheahuychou&apos;, &apos;name&apos;: &apos;Cheahuychou Mao&apos;, &apos;email&apos;: &apos;cheahuychou.mao@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33697&quot; title=&quot;Provide sanity check on number of cached sessions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33697&quot;&gt;&lt;del&gt;SERVER-33697&lt;/del&gt;&lt;/a&gt; Provide sanity check on the number of cached sessions&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ffbaee1a4dcb47a307986cb696807fe979f4a39d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ffbaee1a4dcb47a307986cb696807fe979f4a39d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1938138" author="chou.mao" created="Tue, 3 Jul 2018 18:29:40 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=misha.tyulenev&quot; class=&quot;user-hover&quot; rel=&quot;misha.tyulenev&quot;&gt;misha.tyulenev&lt;/a&gt; Could you please take a look at&#160;the fix suggestions in the &quot;Fix Implementation&quot; section? It is mostly what we discussed offline, just that I think the change will also affect the refresh sessions commands.&lt;/p&gt;</comment>
                            <comment id="1933998" author="kaloian.manassiev" created="Thu, 28 Jun 2018 16:53:47 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=misha.tyulenev&quot; class=&quot;user-hover&quot; rel=&quot;misha.tyulenev&quot;&gt;misha.tyulenev&lt;/a&gt;, can you please work with Chou to figure out the best way to cap the number of active sessions?&lt;/p&gt;</comment>
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