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    <title>MongoDB Jira</title>
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    <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-40298] Track transaction size on 4.0</title>
                <link>https://jira.mongodb.org/browse/SERVER-40298</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Adding metrics around the size of transactions could help us determine what use cases to optimize for. Metrics for the last run transaction:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Number of operations in the transaction&lt;/li&gt;
	&lt;li&gt;Total size of transaction statements in oplog&lt;/li&gt;
	&lt;li&gt;Write Concern&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;There will be a new &lt;tt&gt;serverStatus&lt;/tt&gt; section &lt;tt&gt;transactions.lastCommittedTransaction&lt;/tt&gt;:&lt;/p&gt;
&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    &quot;operationCount&quot; : NumberLong(1),&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    &quot;oplogOperationBytes&quot; : NumberLong(151),&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    &quot;writeConcern&quot;: {&lt;/span&gt;&lt;/pre&gt;
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			&lt;/td&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="721242">SERVER-40298</key>
            <summary>Track transaction size on 4.0</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="tess.avitabile@mongodb.com">Tess Avitabile</assignee>
                                    <reporter username="judah.schvimer@mongodb.com">Judah Schvimer</reporter>
                        <labels>
                    </labels>
                <created>Fri, 22 Mar 2019 18:10:35 +0000</created>
                <updated>Sun, 29 Oct 2023 22:22:42 +0000</updated>
                            <resolved>Fri, 29 Mar 2019 20:33:55 +0000</resolved>
                                                    <fixVersion>4.0.9</fixVersion>
                                    <component>Diagnostics</component>
                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="2196570" author="xgen-internal-githook" created="Fri, 29 Mar 2019 20:33:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;tess.avitabile@mongodb.com&apos;, &apos;name&apos;: &apos;Tess Avitabile&apos;, &apos;username&apos;: &apos;tessavitabile&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40298&quot; title=&quot;Track transaction size on 4.0&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40298&quot;&gt;&lt;del&gt;SERVER-40298&lt;/del&gt;&lt;/a&gt; Track transaction size&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7ea6e5dc1b7ab547dc45211d59eae19ecbda068e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7ea6e5dc1b7ab547dc45211d59eae19ecbda068e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2191870" author="tess.avitabile" created="Tue, 26 Mar 2019 15:25:22 +0000"  >&lt;p&gt;Since we want these metrics on 4.0 quickly, and there is code motion on 4.2 due to Larger Transactions, I will implement this on 4.0 and forward-port if desired.&lt;/p&gt;</comment>
                            <comment id="2191261" author="tess.avitabile" created="Mon, 25 Mar 2019 22:11:43 +0000"  >&lt;p&gt;Metrics for the last run transaction will allow us to determine typical transactions workloads, so that we can target performance work toward those workloads. We considered instead outputting histograms of #ops and size of oplog entries, but we wanted to capture the relationships between these two metrics. We felt that capturing the last run transaction would allow us to decide what axes to look at after we have the data.&lt;/p&gt;

&lt;p&gt;Since this information may only be useful for the Replication and Product teams, we could consider only providing it if requested and not documenting its existence (though we would need to change our data collection to request it).&lt;/p&gt;</comment>
                            <comment id="2191049" author="bruce.lucas@10gen.com" created="Mon, 25 Mar 2019 20:07:17 +0000"  >&lt;blockquote&gt;
&lt;p&gt;Metrics for the last run transaction:&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;Generally speaking, cumulative metrics are preferred because they allow computing and charting averages over arbitrary sample intervals without sampling artifacts. For write concern we could record cumulative number of transactions for each write concern. Is there a specific use case that requires instead metrics for the last run transaction?&lt;/p&gt;</comment>
                    </comments>
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