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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>[SERVER-43889] Distinguish between a retryable write and a transaction when failing a command</title>
                <link>https://jira.mongodb.org/browse/SERVER-43889</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, most txnNumber errors refer only to transactions, even if the error pertains to a retryable write. This can create a poor user experience for someone who is only using retryable writes. &lt;/p&gt;

&lt;p&gt;We should audit these types of errors on the server and determine whether the command was a part of a retryable write or a transaction. Depending on the answer, we can return one of the following errors:&lt;/p&gt;

&lt;p&gt;&quot;Cannot start transaction X on session &amp;lt;UUID&amp;gt; because a newer transaction or retryable write with txnNumber Y has already started on this session.&quot;&lt;/p&gt;

&lt;p&gt;&quot;Retryable write with txnNumber X is prohibited on session &amp;lt;UUID&amp;gt; because a newer transaction or retryable write with txnNumber Y has already started on this session.&quot;&lt;/p&gt;


&lt;p&gt;&lt;b&gt;ORIGINAL POST:&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;Code that reproduces the issue:&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;
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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;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;private&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; &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;static&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; async Task TestSingleSession(MongoClient client)&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;            var col = client.GetDatabase(&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;_test&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;).GetCollection&amp;lt;BsonDocument&amp;gt;(&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;concurrent&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;);                        &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;            using (var session = await client.StartSessionAsync())&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;                var ops = Enumerable.Range(&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;0&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;, &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;100&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;)&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;                    .Select(async e =&amp;gt;&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;                    {&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;                        await col.ReplaceOneAsync(session, Builders&amp;lt;BsonDocument&amp;gt;.Filter.Eq(&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;_id&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;, e),&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;                            &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;new&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; BsonDocument&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;When running above code I&apos;m getting the exception:&lt;/p&gt;

&lt;p&gt;&lt;em&gt;MongoCommandException: Command update failed: Cannot start transaction 1 on session c4fd4081-e0f0-40d6-84fc-cdfeccc74e3b - hf9LJrhq2lfp667gnURrBVE7MCUS1NJZYDmWlqfKWl0= because a newer transaction 3 has already started..&lt;/em&gt;&lt;/p&gt;

&lt;p&gt;This is misleading as there&apos;s no explicit transaction in progress.&lt;/p&gt;

&lt;p&gt;I know now that we should use either&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;ReplaceOneAsync overload without&#160;session&lt;/li&gt;
	&lt;li&gt;Create new session per call to ReplaceOneAsync with session&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;background: I&apos;ve encountered that issue in production code where one method is being used with and without transaction - our solution was to simply create a intermediate overloaded method that creates a session for you and passes it into method that accepts the session.&lt;/p&gt;</description>
                <environment></environment>
        <key id="957610">SERVER-43889</key>
            <summary>Distinguish between a retryable write and a transaction when failing a command</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="13201">Fixed</resolution>
                                        <assignee username="ali.mir@mongodb.com">Ali Mir</assignee>
                                    <reporter username="marek.kresnicki@gmail.com">Marek Kresnicki</reporter>
                        <labels>
                            <label>former-quick-wins</label>
                    </labels>
                <created>Thu, 3 Oct 2019 09:07:57 +0000</created>
                <updated>Sun, 29 Oct 2023 22:16:19 +0000</updated>
                            <resolved>Tue, 18 Feb 2020 16:26:40 +0000</resolved>
                                                    <fixVersion>4.2.6</fixVersion>
                    <fixVersion>4.3.4</fixVersion>
                    <fixVersion>4.0.19</fixVersion>
                                                        <votes>0</votes>
                                    <watches>15</watches>
                                                                                                                <comments>
                            <comment id="3030117" author="xgen-internal-githook" created="Tue, 7 Apr 2020 19:35:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ali Mir&apos;, &apos;email&apos;: &apos;ali.mir@mongodb.com&apos;, &apos;username&apos;: &apos;ali-mir&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43889&quot; title=&quot;Distinguish between a retryable write and a transaction when failing a command&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43889&quot;&gt;&lt;del&gt;SERVER-43889&lt;/del&gt;&lt;/a&gt; Distinguish between retryable write and transaction when failing a command&lt;/p&gt;

&lt;p&gt;(cherry picked from commit eb284b042c71edf0eac445d3ceb79f7fdeabc5d1)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/95626d0eca8325488d354221b1ec5b1019743fa1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/95626d0eca8325488d354221b1ec5b1019743fa1&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3019711" author="xgen-internal-githook" created="Tue, 31 Mar 2020 18:14:04 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ali Mir&apos;, &apos;email&apos;: &apos;ali.mir@mongodb.com&apos;, &apos;username&apos;: &apos;ali-mir&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43889&quot; title=&quot;Distinguish between a retryable write and a transaction when failing a command&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43889&quot;&gt;&lt;del&gt;SERVER-43889&lt;/del&gt;&lt;/a&gt; Distinguish between retryable write and transaction when failing a command&lt;/p&gt;

&lt;p&gt;(cherry picked from commit eb284b042c71edf0eac445d3ceb79f7fdeabc5d1)&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/89a34f9f823a1efccef072cea0cc1c12fbfcfeea&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/89a34f9f823a1efccef072cea0cc1c12fbfcfeea&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2882440" author="xgen-internal-githook" created="Tue, 18 Feb 2020 16:19:44 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ali Mir&apos;, &apos;username&apos;: &apos;ali-mir&apos;, &apos;email&apos;: &apos;ali.mir@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43889&quot; title=&quot;Distinguish between a retryable write and a transaction when failing a command&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43889&quot;&gt;&lt;del&gt;SERVER-43889&lt;/del&gt;&lt;/a&gt; Distinguish between retryable write and transaction when failing a command&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/eb284b042c71edf0eac445d3ceb79f7fdeabc5d1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/eb284b042c71edf0eac445d3ceb79f7fdeabc5d1&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2594572" author="pavithra.vetriselvan" created="Mon, 9 Dec 2019 19:35:25 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=eric.sedor&quot; class=&quot;user-hover&quot; rel=&quot;eric.sedor&quot;&gt;eric.sedor&lt;/a&gt;, thank you for fixing the comments!&lt;/p&gt;

&lt;p&gt;I do agree that we can provide a better user experience here but think it will require a joint effort between the Server and Drivers teams. To aid discussion, I am moving this conversation to email. &lt;/p&gt;</comment>
                            <comment id="2555618" author="eric.sedor" created="Wed, 20 Nov 2019 22:39:49 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=pavithra.vetriselvan&quot; class=&quot;user-hover&quot; rel=&quot;pavithra.vetriselvan&quot;&gt;pavithra.vetriselvan&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Unfortunately I don&apos;t think that will help with the confusion this message causes... Is there any way to implicate the fact that the error is happening because a write is being retried? Ideally we could distinguish between&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;the server transparently retrying a write in an unsuccessful/non-recoverable way&lt;br/&gt;
and&lt;/li&gt;
	&lt;li&gt;a user making a mistake when explicitly using transactions in a way they should not&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="2549802" author="pavithra.vetriselvan" created="Tue, 19 Nov 2019 18:48:06 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=eric.sedor&quot; class=&quot;user-hover&quot; rel=&quot;eric.sedor&quot;&gt;eric.sedor&lt;/a&gt;, do you think changing the error message to what I suggested above is an adequate fix here?&lt;/p&gt;</comment>
                            <comment id="2530343" author="pavithra.vetriselvan" created="Mon, 11 Nov 2019 23:02:11 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=eric.sedor&quot; class=&quot;user-hover&quot; rel=&quot;eric.sedor&quot;&gt;eric.sedor&lt;/a&gt;, I think &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35411&quot; title=&quot;Add abortCause argument to abortActiveTransaction and save it on the session&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35411&quot;&gt;SERVER-35411&lt;/a&gt; focuses more on remembering why a transaction aborts so that we can more reliably deliver a &#8216;TransientTransactionError&#8217; label to drivers.&lt;/p&gt;

&lt;p&gt;We throw with the error mentioned in this ticket because we are trying to run an operation with a lower txnNumber than the current txnNumber. When running retryable writes concurrently on the same session, we can imagine a scenario where write 1 (txnNumber = 1) fails, write 2 (txnNumber = 2) starts and overwrites the txnNumber for the session, and write 1 (txnNumber = 1) retries.&lt;/p&gt;

&lt;p&gt;Since we&apos;re explicitly checking the txnNumber, which is used for retryable writes and transactions, one solution could be changing the error message to:&lt;br/&gt;
&quot;Cannot use txnNumber 1 on session &amp;lt;sessionID&amp;gt; because a newer txnNumber 3 is currently being used.&quot;&lt;/p&gt;</comment>
                            <comment id="2501644" author="eric.sedor" created="Fri, 25 Oct 2019 20:08:30 +0000"  >&lt;p&gt;Does &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35411&quot; title=&quot;Add abortCause argument to abortActiveTransaction and save it on the session&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35411&quot;&gt;SERVER-35411&lt;/a&gt; help us be more specific here?&lt;/p&gt;</comment>
                            <comment id="2475994" author="eric.sedor" created="Thu, 10 Oct 2019 16:48:14 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=marek.kresnicki%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;marek.kresnicki@gmail.com&quot;&gt;marek.kresnicki@gmail.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;We wanted to let you know we are looking into this. Thanks in advance for your patience.&lt;/p&gt;</comment>
                            <comment id="2461596" author="marek.kresnicki@gmail.com" created="Thu, 3 Oct 2019 10:28:45 +0000"  >&lt;p&gt;Forgot to mention that this has been working fine in version 2.8.1&lt;/p&gt;</comment>
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