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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-35157] Add transactions latency tracking to OperationLatencyHistogram </title>
                <link>https://jira.mongodb.org/browse/SERVER-35157</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;To support the tracking of transaction latency information in serverStatus, we want to add a transactions section to the &lt;tt&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/be09d7bf0a72f44f8909221f178a70a2cb0a6b68/src/mongo/db/stats/operation_latency_histogram.h#L43&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;OperationLatencyHistogram&lt;/a&gt;&lt;/tt&gt; class. We can add a &lt;tt&gt;HistogramData _txns&lt;/tt&gt; member variable, analogous to the existing &lt;tt&gt;_reads, _writes&lt;/tt&gt; and &lt;tt&gt;_commands&lt;/tt&gt; &lt;a href=&quot;https://github.com/mongodb/mongo/blob/be09d7bf0a72f44f8909221f178a70a2cb0a6b68/src/mongo/db/stats/operation_latency_histogram.h#L78&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;variables&lt;/a&gt;. We will also need to add a new &lt;tt&gt;Command::ReadWriteType&lt;/tt&gt; type that represents a multi-document transaction.&lt;/p&gt;</description>
                <environment></environment>
        <key id="547640">SERVER-35157</key>
            <summary>Add transactions latency tracking to OperationLatencyHistogram </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="nathan.louie">Nathan Louie</assignee>
                                    <reporter username="william.schultz@mongodb.com">William Schultz</reporter>
                        <labels>
                            <label>global-txn-metrics</label>
                    </labels>
                <created>Tue, 22 May 2018 17:00:45 +0000</created>
                <updated>Sun, 29 Oct 2023 22:31:32 +0000</updated>
                            <resolved>Thu, 5 Jul 2018 20:23:01 +0000</resolved>
                                                    <fixVersion>4.1.1</fixVersion>
                                    <component>Diagnostics</component>
                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1977940" author="xgen-internal-githook" created="Thu, 16 Aug 2018 20:22:53 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;nxlouie&apos;, &apos;email&apos;: &apos;nathan.louie@10gen.com&apos;, &apos;name&apos;: &apos;Nathan Louie&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35157&quot; title=&quot;Add transactions latency tracking to OperationLatencyHistogram &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35157&quot;&gt;&lt;del&gt;SERVER-35157&lt;/del&gt;&lt;/a&gt; Add transactions latency tracking to OperationLatencyHistogram&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 96c5d840db4f4279cd9fc8ffe4bdfdc60fcd3984)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8376aa91cb065a7c23d5dcec56e0ab54d30dc81d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8376aa91cb065a7c23d5dcec56e0ab54d30dc81d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1939941" author="xgen-internal-githook" created="Thu, 5 Jul 2018 20:15:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;nxlouie&apos;, &apos;name&apos;: &apos;Nathan Louie&apos;, &apos;email&apos;: &apos;nathan.louie@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35157&quot; title=&quot;Add transactions latency tracking to OperationLatencyHistogram &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35157&quot;&gt;&lt;del&gt;SERVER-35157&lt;/del&gt;&lt;/a&gt; Add transactions latency tracking to OperationLatencyHistogram&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/96c5d840db4f4279cd9fc8ffe4bdfdc60fcd3984&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/96c5d840db4f4279cd9fc8ffe4bdfdc60fcd3984&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1905277" author="william.schultz" created="Wed, 30 May 2018 21:36:58 +0000"  >&lt;p&gt;To Kyle&apos;s point, it is simply the first command of a transaction that marks its &quot;start&quot;. The latency should be measured from that time until the commit or abort event.&lt;/p&gt;

&lt;p&gt;To Bruce&apos;s last comment, yes I think that is roughly correct, but that will be fleshed out separately, in the tickets for tracking abort causes and their counts.&lt;/p&gt;</comment>
                            <comment id="1900658" author="bruce.lucas@10gen.com" created="Thu, 24 May 2018 14:17:40 +0000"  >&lt;p&gt;There&apos;s no startTransaction command as such, but indeed commitTransaction and abortTransaction will show up in the command section.&lt;/p&gt;

&lt;p&gt;I think that transactions that time out should be counted in transactions.totalAborted, and there should be a transactions.abortCause.timedOut counter, alongisde transactions.abortCause.aborted (for explicitly aborted transactions). &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=william.schultz&quot; class=&quot;user-hover&quot; rel=&quot;william.schultz&quot;&gt;william.schultz&lt;/a&gt;, do you agree? (Also I think this comment goes with a different ticket).&lt;/p&gt;</comment>
                            <comment id="1899899" author="kyle.suarez" created="Wed, 23 May 2018 18:45:08 +0000"  >&lt;p&gt;Cool, thanks for confirming. Also, &lt;tt&gt;startTransaction&lt;/tt&gt;, &lt;tt&gt;commitTransaction&lt;/tt&gt; and &lt;tt&gt;abortTransaction&lt;/tt&gt; are all themselves commands, so I presume they will show up in the &quot;command&quot; section as well.&lt;/p&gt;

&lt;p&gt;The transaction reaper will have to be updated to make sure it records the total time of the transaction when killing it. This reaping probably should not count as an explicit &lt;tt&gt;abortTransaction&lt;/tt&gt;, though.&lt;/p&gt;</comment>
                            <comment id="1899871" author="bruce.lucas@10gen.com" created="Wed, 23 May 2018 18:34:44 +0000"  >&lt;p&gt;Yes, that&apos;s the intent.&lt;/p&gt;</comment>
                            <comment id="1899866" author="kyle.suarez" created="Wed, 23 May 2018 18:32:16 +0000"  >&lt;p&gt;To clarify, this section tracks the latency of an entire transaction, from &lt;tt&gt;startTransaction&lt;/tt&gt; to commit or abort? For example, if a user does&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&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;  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;session.startTransaction({...});&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;session.getCollection(&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;coll&quot;&lt;/span&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;).find();&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;session.abortTransaction();&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;session.startTransaction({...});&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;session.getCollection(&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;coll&quot;&lt;/span&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;).insert({x: 1});&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;session.getCollection(&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;coll&quot;&lt;/span&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;).find();&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;   margin-bottom: 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;session.commitTransaction();&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;then the global operation latency histogram will have entries for two reads, one write and two transactions?&lt;/p&gt;</comment>
                    </comments>
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                                        <issuelink>
            <issuekey id="547646">SERVER-35159</issuekey>
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