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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-33951] Abort transactions when the pending writes pass 16MB worth of write data</title>
                <link>https://jira.mongodb.org/browse/SERVER-33951</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In addition to failing at commit time if the applyOps oplog entry that would get written is over 16Mb, we should also pro-actively abort transactions before they reach commit time if the in-memory OperationDescriptions of the pending writes passes 16Mb&lt;/p&gt;</description>
                <environment></environment>
        <key id="512783">SERVER-33951</key>
            <summary>Abort transactions when the pending writes pass 16MB worth of write data</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="matthew.russotto@mongodb.com">Matthew Russotto</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                    </labels>
                <created>Fri, 16 Mar 2018 21:36:02 +0000</created>
                <updated>Sun, 29 Oct 2023 22:33:39 +0000</updated>
                            <resolved>Fri, 13 Apr 2018 20:12:42 +0000</resolved>
                                                    <fixVersion>3.7.4</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1864144" author="xgen-internal-githook" created="Fri, 13 Apr 2018 20:12:12 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;matthew.russotto@10gen.com&apos;, &apos;name&apos;: &apos;Matthew Russotto&apos;, &apos;username&apos;: &apos;mtrussotto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33951&quot; title=&quot;Abort transactions when the pending writes pass 16MB worth of write data&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33951&quot;&gt;&lt;del&gt;SERVER-33951&lt;/del&gt;&lt;/a&gt; Abort transactions when the pending writes pass 16MB worth of write data&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7c65bad3c3dd5e9fe47cdb835d5374113596df3e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7c65bad3c3dd5e9fe47cdb835d5374113596df3e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1837366" author="daniel.gottlieb@10gen.com" created="Fri, 16 Mar 2018 23:47:21 +0000"  >&lt;p&gt;&lt;del&gt;Is this just an optimization, or is this required to be &quot;perfect&quot;? I.e: if the transaction is not proactively aborted, must it be guaranteed for the applyOps oplog entry to be less than 16MB?&lt;/del&gt;&lt;/p&gt;

&lt;p&gt;&lt;del&gt;An `applyOps` document has additional overhead because of the other fields it contains in addition to the the &quot;keys&quot; being numeric strings. Calculating the size a series of oplog entries would combine into is hard without actually performing the serialization.&lt;/del&gt;&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Edit&lt;/b&gt; After rereading, I can now see this check should be in addition to failing at commit time due to the oplog size. I didn&apos;t realize the motivation for this ticket was preventing resource exhaustion.&lt;/p&gt;</comment>
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