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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>
    </build-info>


<item>
            <title>[GODRIVER-2931] Add a way to get txnNumber from mongo.Session</title>
                <link>https://jira.mongodb.org/browse/GODRIVER-2931</link>
                <project id="14289" key="GODRIVER">Go Driver</project>
                    <description>&lt;div class=&quot;panel&quot; style=&quot;background-color: #fafbfc;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #fafbfc;&quot;&gt;
&lt;h3&gt;&lt;a name=&quot;Summary&quot;&gt;&lt;/a&gt;&lt;b&gt;Summary&lt;/b&gt;&lt;/h3&gt;

&lt;p&gt;In mongosync, I want to be able to log the lsid and txnNumber of a transaction so I can easily search for problematic transactions in the oplog. Currently I can get the lsid from Session.ID() but that is not enough to uniquely identify a transaction.&lt;/p&gt;

&lt;p&gt;I was thinking something like this:&lt;/p&gt;
&lt;p/&gt;
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&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;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;func (s *sessionImpl) TxnNumber() int64 {&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; &#160; &#160; &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;return&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; s.clientSession.TxnNumber &lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;And add TxnNumber() to the Session interface.&lt;/p&gt;

&lt;p&gt;We already have Session.ID() so I think there is precedence for providing this kind of info in the public API for Session.&lt;/p&gt;

&lt;p&gt;If we cannot get the txnNumber from the stable API, I would settle for a way to make the Go driver log it.&lt;/p&gt;
&lt;h3&gt;&lt;a name=&quot;Motivation&quot;&gt;&lt;/a&gt;&lt;b&gt;Motivation&lt;/b&gt;&lt;/h3&gt;
&lt;h4&gt;&lt;a name=&quot;Whoistheaffectedenduser%3F&quot;&gt;&lt;/a&gt;Who is the affected end user?&lt;/h4&gt;

&lt;p&gt;TAR Team&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;Howdoesthisaffecttheenduser%3F&quot;&gt;&lt;/a&gt;How does this affect the end user?&lt;/h4&gt;

&lt;p&gt;Debugging BFs is greatly slowing our velocity. Improving our ability to debug will allow us to ship features quicker.&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;Howlikelyisitthatthisproblemorusecasewilloccur%3F&quot;&gt;&lt;/a&gt;How likely is it that this problem or use case will occur?&lt;/h4&gt;

&lt;p&gt;Associating operations in logs with operations on the server is a common problem we face.&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;Iftheproblemdoesoccur%2Cwhataretheconsequencesandhowseverearethey%3F&quot;&gt;&lt;/a&gt;If the problem does occur, what are the consequences and how severe are they?&lt;/h4&gt;

&lt;p&gt;Lost time on debugging.&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;Isthisissueurgent%3F&quot;&gt;&lt;/a&gt;Is this issue urgent?&lt;/h4&gt;

&lt;p&gt;This is causing pain now so would be nice to discuss solutions soon.&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;Isthisticketrequiredbyadownstreamteam%3F&quot;&gt;&lt;/a&gt;Is this ticket required by a downstream team?&lt;/h4&gt;

&lt;p&gt;TAR&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;Isthisticketonlyfortests%3F&quot;&gt;&lt;/a&gt;Is this ticket only for tests?&lt;/h4&gt;

&lt;p&gt;Just for test improvements.&lt;/p&gt;
&lt;h3&gt;&lt;a name=&quot;CastofCharacters&quot;&gt;&lt;/a&gt;&lt;b&gt;Cast of Characters&lt;/b&gt;&lt;/h3&gt;

&lt;p&gt;Engineering Lead:&lt;br/&gt;
Document Author: &lt;br/&gt;
POCers: &lt;br/&gt;
Product Owner: &lt;br/&gt;
Program Manager: &lt;br/&gt;
Stakeholders:&lt;/p&gt;
&lt;h3&gt;&lt;a name=&quot;Channels%26Docs&quot;&gt;&lt;/a&gt;&lt;b&gt;Channels &amp;amp; Docs&lt;/b&gt;&lt;/h3&gt;
&lt;h4&gt;&lt;a name=&quot;%C2%A0&quot;&gt;&lt;/a&gt;&#160;&lt;/h4&gt;
&lt;/div&gt;&lt;/div&gt;</description>
                <environment></environment>
        <key id="2407546">GODRIVER-2931</key>
            <summary>Add a way to get txnNumber from mongo.Session</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="13202">Works as Designed</resolution>
                                        <assignee username="preston.vasquez@mongodb.com">Preston Vasquez</assignee>
                                    <reporter username="tim.fogarty@mongodb.com">Tim Fogarty</reporter>
                        <labels>
                    </labels>
                <created>Wed, 2 Aug 2023 21:27:57 +0000</created>
                <updated>Fri, 27 Oct 2023 13:16:19 +0000</updated>
                            <resolved>Tue, 12 Sep 2023 19:28:32 +0000</resolved>
                                                                    <component>Sessions</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5699075" author="tim.fogarty" created="Tue, 12 Sep 2023 19:25:55 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=preston.vasquez%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;preston.vasquez@mongodb.com&quot;&gt;preston.vasquez@mongodb.com&lt;/a&gt;! Great! I think the &lt;a href=&quot;https://pkg.go.dev/go.mongodb.org/mongo-driver/event#CommandStartedEvent&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;CommandStartedEvent.Command&lt;/a&gt; would work for our use case. Thank you for the suggestion.&lt;/p&gt;

&lt;p&gt;Since we have a way to log this, please feel free to close the ticket if you don&apos;t want to implement Session.ID().&lt;/p&gt;</comment>
                            <comment id="5699052" author="JIRAUSER1265158" created="Tue, 12 Sep 2023 19:18:29 +0000"  >&lt;p&gt;Hey &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=tim.fogarty%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;tim.fogarty@mongodb.com&quot;&gt;tim.fogarty@mongodb.com&lt;/a&gt; , thank you for submitting this ticket !&lt;/p&gt;

&lt;p&gt;What is the use case for exposing the current transaction number on the stable API? Although it&apos;s deprecated, you can source the TxnNumber from &lt;a href=&quot;https://pkg.go.dev/go.mongodb.org/mongo-driver/mongo#XSession&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongo.XSession&lt;/a&gt;:&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;
		&lt;tbody &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, err := newSession(client)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;if err != nil {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;	panic(err)&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;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&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;xsession := session.(mongo.XSession)&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;clientSession := xsession.ClientSession()&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;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&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-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;fmt.Println(&quot;current txn number: &quot;, clientSession.TxnNumber)&lt;/span&gt;&lt;/pre&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;I understand that this is unstable API. Alternatively, you mention that:&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;If we cannot get the txnNumber from the stable API, I would settle for a way to make the Go driver log it.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;The event monitor will include both the &quot;lsid&quot; and &quot;txnNumber&quot; in the &lt;a href=&quot;https://pkg.go.dev/go.mongodb.org/mongo-driver/event#CommandStartedEvent&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;CommandStartedEvent.Command&lt;/a&gt; message. For example:&lt;/p&gt;

&lt;p/&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;   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;{&quot;id&quot;: {&quot;$binary&quot;:{&quot;base64&quot;:&quot;LpMQKEQfTbS4PEaNRqzd0w==&quot;,&quot;subType&quot;:&quot;04&quot;}}} {&quot;insert&quot;: &quot;test&quot;,&quot;ordered&quot;: true,&quot;lsid&quot;: {&quot;id&quot;: {&quot;$binary&quot;:{&quot;base64&quot;:&quot;LpMQKEQfTbS4PEaNRqzd0w==&quot;,&quot;subType&quot;:&quot;04&quot;}}},&quot;txnNumber&quot;: {&quot;$numberLong&quot;:&quot;1&quot;},&quot;startTransaction&quot;: true,&quot;autocommit&quot;: false,&quot;$clusterTime&quot;: {&quot;clusterTime&quot;: {&quot;$timestamp&quot;:{&quot;t&quot;:1694545352,&quot;i&quot;:1}},&quot;signature&quot;: {&quot;hash&quot;: {&quot;$binary&quot;:{&quot;base64&quot;:&quot;AAAAAAAAAAAAAAAAAAAAAAAAAAA=&quot;,&quot;subType&quot;:&quot;00&quot;}},&quot;keyId&quot;: {&quot;$numberLong&quot;:&quot;0&quot;}}},&quot;$db&quot;: &quot;test&quot;,&quot;documents&quot;: [{&quot;_id&quot;: {&quot;$oid&quot;:&quot;6500b5c922e2d90762af0abf&quot;},&quot;foo&quot;: {&quot;$numberInt&quot;:&quot;1&quot;}}]}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Will either of these solutions work for your team?&lt;/p&gt;</comment>
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