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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-74301] Optimize serialization behavior for $changeStreamSplitLargeEvent</title>
                <link>https://jira.mongodb.org/browse/SERVER-74301</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Allow &apos;BSONObj::LargeSizeTrait&apos; to Document::toBsonWithMetadata() method.&lt;/li&gt;
	&lt;li&gt;Make Document::toBsonWithMetadata() and Document::fromBsonWithMetadata() use &apos;trivial&apos; conversion. In other words, documents created with myDoc.fromBsonWithMetadata(otherDocument.toBsonWithMetadata()) and not modified afterwarrds should re-use the storage and not serialize again when myDoc.toBsonWithMetadata() is called.&lt;/li&gt;
	&lt;li&gt;Avoid unnecessary serializations in PlanExecutorPipeline and in &lt;tt&gt;change_stream_split_event::splitChangeEvent&lt;/tt&gt;.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="2273132">SERVER-74301</key>
            <summary>Optimize serialization behavior for $changeStreamSplitLargeEvent</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="romans.kasperovics@mongodb.com">Romans Kasperovics</assignee>
                                    <reporter username="romans.kasperovics@mongodb.com">Romans Kasperovics</reporter>
                        <labels>
                    </labels>
                <created>Thu, 23 Feb 2023 10:48:06 +0000</created>
                <updated>Sun, 29 Oct 2023 21:25:49 +0000</updated>
                            <resolved>Thu, 6 Apr 2023 14:19:15 +0000</resolved>
                                                    <fixVersion>7.0.0-rc0</fixVersion>
                    <fixVersion>6.0.7</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5557357" author="xgen-internal-githook" created="Tue, 11 Jul 2023 14:21:24 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Serhii Lysenko&apos;, &apos;email&apos;: &apos;serhii.lysenko@mongodb.com&apos;, &apos;username&apos;: &apos;serhiitea&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-71828&quot; title=&quot;Add $changeStreamSplitLargeEvent stage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-71828&quot;&gt;&lt;del&gt;SERVER-71828&lt;/del&gt;&lt;/a&gt; Add $changeStreamSplitLargeEvent stage&lt;/p&gt;

&lt;p&gt;This change is a part of PM-2677 backport.&lt;br/&gt;
It includes the following changes:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-71828&quot; title=&quot;Add $changeStreamSplitLargeEvent stage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-71828&quot;&gt;&lt;del&gt;SERVER-71828&lt;/del&gt;&lt;/a&gt; Add $changeStreamSplitLargeEvent stage&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74301&quot; title=&quot;Optimize serialization behavior for $changeStreamSplitLargeEvent&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74301&quot;&gt;&lt;del&gt;SERVER-74301&lt;/del&gt;&lt;/a&gt; Optimize serialization behavior for $changeStreamSplitLargeEvent&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74716&quot; title=&quot;Prevent &amp;quot;back-in-time&amp;quot; change stream resume token on MongoS&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74716&quot;&gt;&lt;del&gt;SERVER-74716&lt;/del&gt;&lt;/a&gt; Require splitEvent stage for splitEvent token&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-67699&quot; title=&quot;Add tracking for when change stream event exceeds 16Mb&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-67699&quot;&gt;&lt;del&gt;SERVER-67699&lt;/del&gt;&lt;/a&gt; Implement changeStreamsLargeEventsFailedCounter&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/55a7d7985b2377d3c45364220e625e39d1e76b99&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/55a7d7985b2377d3c45364220e625e39d1e76b99&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="5517708" author="xgen-internal-githook" created="Thu, 22 Jun 2023 09:58:45 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Serhii Lysenko&apos;, &apos;email&apos;: &apos;serhii.lysenko@mongodb.com&apos;, &apos;username&apos;: &apos;serhiitea&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-71825&quot; title=&quot;Implement and test document split algorithm&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-71825&quot;&gt;&lt;del&gt;SERVER-71825&lt;/del&gt;&lt;/a&gt; Implement and test document split algorithm&lt;/p&gt;

&lt;p&gt;This change is a part of PM-2677 backport.&lt;br/&gt;
It includes the following changes:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-71825&quot; title=&quot;Implement and test document split algorithm&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-71825&quot;&gt;&lt;del&gt;SERVER-71825&lt;/del&gt;&lt;/a&gt; Implement and test document split algorithm&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-73590&quot; title=&quot;change_stream_split_event_helpers_test fails due to bad comparison&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-73590&quot;&gt;&lt;del&gt;SERVER-73590&lt;/del&gt;&lt;/a&gt; Fix size_t and boost::optional&amp;lt;size_t&amp;gt; comparison in a unit test&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74301&quot; title=&quot;Optimize serialization behavior for $changeStreamSplitLargeEvent&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74301&quot;&gt;&lt;del&gt;SERVER-74301&lt;/del&gt;&lt;/a&gt; Optimize serialization behavior for $changeStreamSplitLargeEvent&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a0c5ede41350c2fcaa22848fea0fd5660b89ac5b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a0c5ede41350c2fcaa22848fea0fd5660b89ac5b&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="5500861" author="xgen-internal-githook" created="Thu, 15 Jun 2023 09:10:20 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Romans Kasperovics&apos;, &apos;email&apos;: &apos;romans.kasperovics@mongodb.com&apos;, &apos;username&apos;: &apos;romanskas&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74301&quot; title=&quot;Optimize serialization behavior for $changeStreamSplitLargeEvent&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74301&quot;&gt;&lt;del&gt;SERVER-74301&lt;/del&gt;&lt;/a&gt; Optimize Document-&amp;gt;BSON serialization&lt;/p&gt;

&lt;p&gt;Track when document&apos;s metadata is changed to make better use of the&lt;br/&gt;
trivial Document-&amp;gt;BSON conversion (when the underlying storage can be&lt;br/&gt;
returned unmodified), which saves time &amp;amp; memory.&lt;/p&gt;

&lt;p&gt;This change is a part of PM-2677 backport.&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ca49097b6a9cdbaea662bf0ee5184ffac49c2ccf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ca49097b6a9cdbaea662bf0ee5184ffac49c2ccf&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5329042" author="xgen-internal-githook" created="Thu, 6 Apr 2023 08:04:35 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Romans Kasperovics&apos;, &apos;email&apos;: &apos;romans.kasperovics@mongodb.com&apos;, &apos;username&apos;: &apos;romanskas&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74301&quot; title=&quot;Optimize serialization behavior for $changeStreamSplitLargeEvent&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74301&quot;&gt;&lt;del&gt;SERVER-74301&lt;/del&gt;&lt;/a&gt; Optimize serialization behavior for $changeStreamSplitLargeEvent&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/41ece0ab8e660dd2993141334ce10a189516bdb4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/41ece0ab8e660dd2993141334ce10a189516bdb4&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5231784" author="bernard.gorman" created="Sun, 26 Feb 2023 18:07:53 +0000"  >&lt;p&gt;As part of this ticket, we should also audit &lt;tt&gt;PlanExecutorPipeline&lt;/tt&gt; to make sure that we&apos;re not doing any unnecessary serialization for change stream events.&lt;/p&gt;</comment>
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