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    <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>[DOCS-12634] Docs for SERVER-40105: Improve diagnostic information in currentOp for excessive write conflicts and prepare conflicts</title>
                <link>https://jira.mongodb.org/browse/DOCS-12634</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;
&lt;blockquote&gt;
&lt;h3&gt;&lt;a name=&quot;Description%3A&quot;&gt;&lt;/a&gt;Description: &lt;/h3&gt;

&lt;p&gt;The top-level fields &apos;writeConflicts&apos; and &apos;prepareReadConflicts&apos; are now present in the currentOp() output.&lt;/p&gt;

&lt;p&gt;The number of write conflicts represents the number of times a write attempt conflicted with another operation on the same document.&lt;/p&gt;

&lt;p&gt;The number of prepare conflicts represents the number of times the operation blocked waiting for a write by a prepared transaction to commit or abort. An operation blocked on prepare conflicts holds both locks and storage engine resources while waiting.&lt;/p&gt;

&lt;h3&gt;&lt;a name=&quot;EngineeringTicketDescription%3A&quot;&gt;&lt;/a&gt;Engineering Ticket Description:&lt;/h3&gt;

&lt;p&gt;Currently, when a non-transactional write conflicts with an active transaction, that write may keep retrying thousands of times until the transaction finally commits or aborts. This situation is hard to diagnose, because currentOp doesn&apos;t show that the active non-transactional writes have occurred so many retries.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Changes made by this ticket:&lt;/b&gt;&lt;br/&gt;
The top-level fields &apos;writeConflicts&apos; and &apos;prepareReadConflicts&apos; are now present in the currentOp() output. &lt;/p&gt;

&lt;p&gt;The number of write conflicts represents the number of times a write attempt conflicted with another operation on the same document. &lt;/p&gt;

&lt;p&gt;The number of prepare conflicts represents the number of times the operation blocked waiting for a write by a prepared transaction to commit or abort. An operation blocked on prepare conflicts holds both locks and storage engine resources while waiting.&lt;/p&gt;&lt;/blockquote&gt;

&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;ul&gt;
	&lt;li&gt;currentOp command and $currentOp pipeline stage&lt;/li&gt;
	&lt;li&gt;4.2 rel notes&lt;/li&gt;
	&lt;li&gt;link in transactions considerations page.&lt;/li&gt;
&lt;/ul&gt;


&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
</description>
                <environment></environment>
        <key id="738565">DOCS-12634</key>
            <summary>Docs for SERVER-40105: Improve diagnostic information in currentOp for excessive write conflicts and prepare conflicts</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="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="kay.kim@mongodb.com">Kay Kim</reporter>
                        <labels>
                    </labels>
                <created>Mon, 15 Apr 2019 12:31:12 +0000</created>
                <updated>Mon, 13 Nov 2023 18:22:55 +0000</updated>
                            <resolved>Mon, 3 Jun 2019 15:48:02 +0000</resolved>
                                                    <fixVersion>4.1.11</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2264510" author="xgen-internal-githook" created="Wed, 29 May 2019 22:11:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;name&apos;: &apos;Kay Kim&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-12634&quot; title=&quot;Docs for SERVER-40105: Improve diagnostic information in currentOp for excessive write conflicts and prepare conflicts&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-12634&quot;&gt;&lt;del&gt;DOCS-12634&lt;/del&gt;&lt;/a&gt;: 4.2 currentOp conflict metrics&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/8ee807f348ccd9dc803105868274080c8b84c288&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/8ee807f348ccd9dc803105868274080c8b84c288&lt;/a&gt;&lt;/p&gt;</comment>
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