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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>[DOCS-11904] Docs for SERVER-33697: Provide sanity check on number of cached sessions</title>
                <link>https://jira.mongodb.org/browse/DOCS-11904</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;----------------------------&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;OriginalDescription&quot;&gt;&lt;/a&gt;Original Description&lt;/h2&gt;

&lt;blockquote&gt;
&lt;h3&gt;&lt;a name=&quot;Description%3A&quot;&gt;&lt;/a&gt;Description: &lt;/h3&gt;

&lt;p&gt;No documentation summary in engineering ticket&lt;/p&gt;

&lt;h3&gt;&lt;a name=&quot;EngineeringTicketDescription%3A&quot;&gt;&lt;/a&gt;Engineering Ticket Description:&lt;/h3&gt;

&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;&lt;/blockquote&gt;
&lt;p&gt;----------------------------&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Scopeofchanges%28filesthatneedworkandhowmuch%29&quot;&gt;&lt;/a&gt;Scope of changes (files that need work and how much)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Impacttootherdocsoutsideofthisproduct&quot;&gt;&lt;/a&gt;Impact to other docs outside of this product&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28workanddate%3F%29&quot;&gt;&lt;/a&gt;MVP (work and date?)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28e.g.ScopeDocs%2CInvision%29&quot;&gt;&lt;/a&gt;Resources (e.g. Scope Docs, Invision)&lt;/h2&gt;</description>
                <environment></environment>
        <key id="575068">DOCS-11904</key>
            <summary>Docs for SERVER-33697: Provide sanity check on number of cached sessions</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="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="kay.kim@mongodb.com">Kay Kim</reporter>
                        <labels>
                            <label>ShardingTechDebt</label>
                    </labels>
                <created>Mon, 23 Jul 2018 16:33:09 +0000</created>
                <updated>Sun, 29 Oct 2023 13:57:33 +0000</updated>
                            <resolved>Wed, 5 Sep 2018 21:33:37 +0000</resolved>
                                                    <fixVersion>3.6.7</fixVersion>
                    <fixVersion>4.0.1</fixVersion>
                    <fixVersion>4.1.1</fixVersion>
                                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="1993233" author="xgen-internal-githook" created="Tue, 4 Sep 2018 22:45:43 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;kay&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-11904&quot; title=&quot;Docs for SERVER-33697: Provide sanity check on number of cached sessions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-11904&quot;&gt;&lt;del&gt;DOCS-11904&lt;/del&gt;&lt;/a&gt;: maxSessions parameter for 3.6.7&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/e2df360ccbf0d4034e903bb62b738a52a0d6ab6f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/e2df360ccbf0d4034e903bb62b738a52a0d6ab6f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1993232" author="xgen-internal-githook" created="Tue, 4 Sep 2018 22:44:00 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;kay&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-11904&quot; title=&quot;Docs for SERVER-33697: Provide sanity check on number of cached sessions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-11904&quot;&gt;&lt;del&gt;DOCS-11904&lt;/del&gt;&lt;/a&gt;: maxSessions parameter&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/ba411c31a27094142467874d61781203f079dc1b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/ba411c31a27094142467874d61781203f079dc1b&lt;/a&gt;&lt;/p&gt;</comment>
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