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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-33158] Logical Session refresh batches are too large</title>
                <link>https://jira.mongodb.org/browse/SERVER-33158</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The batches created by the LogicalSessionCache can exceed the 16mb bson size limit for bson on the wire.  This will cause the refresh step to fail, preventing logical sessions from ever being synced to the global collection.&lt;/p&gt;

&lt;p&gt;This happens because we don&apos;t explicitly size our batches (we were relying on the write_cmd item batch limit, rather than a byte limit).  Previously the write_cmd batch limit had been 1000 items, which allowed for 16k per record.  The new limit is 100k, which gives a 160 byte budget we can exceed with very large user names (as we sync the lsid + the user@db name).&lt;/p&gt;

&lt;p&gt;By forcing a new 10k limit on username sizes used with logical sessions we can then ensure that a lower 1k limit will always be safe.&lt;/p&gt;</description>
                <environment></environment>
        <key id="493797">SERVER-33158</key>
            <summary>Logical Session refresh batches are too large</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="13201">Fixed</resolution>
                                        <assignee username="mira.carey@mongodb.com">Mira Carey</assignee>
                                    <reporter username="mira.carey@mongodb.com">Mira Carey</reporter>
                        <labels>
                    </labels>
                <created>Wed, 7 Feb 2018 16:07:11 +0000</created>
                <updated>Sun, 29 Oct 2023 22:35:02 +0000</updated>
                            <resolved>Thu, 8 Feb 2018 20:21:17 +0000</resolved>
                                                    <fixVersion>3.6.3</fixVersion>
                    <fixVersion>3.7.2</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="1800803" author="xgen-internal-githook" created="Fri, 9 Feb 2018 15:29:16 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;jcarey@argv.me&apos;, &apos;name&apos;: &apos;Jason Carey&apos;, &apos;username&apos;: &apos;hanumantmk&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33158&quot; title=&quot;Logical Session refresh batches are too large&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33158&quot;&gt;&lt;del&gt;SERVER-33158&lt;/del&gt;&lt;/a&gt; Shrink LogicalSession refresh batches&lt;/p&gt;

&lt;p&gt;The batches created by the LogicalSessionCache can exceed the 16mb bson&lt;br/&gt;
size limit for bson on the wire.  This will cause the refresh step to&lt;br/&gt;
fail, preventing logical sessions from ever being synced to the global&lt;br/&gt;
collection.&lt;/p&gt;

&lt;p&gt;This happens because we don&apos;t explicitly size our batches (we were&lt;br/&gt;
relying on the write_cmd item batch limit, rather than a byte limit).&lt;br/&gt;
Previously the write_cmd batch limit had been 1000 items, which allowed&lt;br/&gt;
for 16k per record.  The new limit is 100k, which gives a 160 byte&lt;br/&gt;
budget we can exceed with very large user names (as we sync the lsid&lt;br/&gt;
+ the user@db name).&lt;/p&gt;

&lt;p&gt;By forcing a new 10k limit on username sizes used with logical sessions&lt;br/&gt;
we can then ensure that a lower 1k limit will always be safe.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 4ae174dd53adaea999715ffbe19c435d685bc412)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e872183bb267ab7202bad421523f9ec96e12d933&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e872183bb267ab7202bad421523f9ec96e12d933&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1799951" author="xgen-internal-githook" created="Thu, 8 Feb 2018 20:19:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;jcarey@argv.me&apos;, &apos;name&apos;: &apos;Jason Carey&apos;, &apos;username&apos;: &apos;hanumantmk&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33158&quot; title=&quot;Logical Session refresh batches are too large&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33158&quot;&gt;&lt;del&gt;SERVER-33158&lt;/del&gt;&lt;/a&gt; Shrink LogicalSession refresh batches&lt;/p&gt;

&lt;p&gt;The batches created by the LogicalSessionCache can exceed the 16mb bson&lt;br/&gt;
size limit for bson on the wire.  This will cause the refresh step to&lt;br/&gt;
fail, preventing logical sessions from ever being synced to the global&lt;br/&gt;
collection.&lt;/p&gt;

&lt;p&gt;This happens because we don&apos;t explicitly size our batches (we were&lt;br/&gt;
relying on the write_cmd item batch limit, rather than a byte limit).&lt;br/&gt;
Previously the write_cmd batch limit had been 1000 items, which allowed&lt;br/&gt;
for 16k per record.  The new limit is 100k, which gives a 160 byte&lt;br/&gt;
budget we can exceed with very large user names (as we sync the lsid&lt;br/&gt;
+ the user@db name).&lt;/p&gt;

&lt;p&gt;By forcing a new 10k limit on username sizes used with logical sessions&lt;br/&gt;
we can then ensure that a lower 1k limit will always be safe.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4ae174dd53adaea999715ffbe19c435d685bc412&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4ae174dd53adaea999715ffbe19c435d685bc412&lt;/a&gt;&lt;/p&gt;</comment>
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