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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-68739] Add WiredTiger session statistic without affecting slow op statistics</title>
                <link>https://jira.mongodb.org/browse/SERVER-68739</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;WiredTiger has some statistics that are maintained for each session. They are tightly coupled to the storage section of the slow operation statistics in the server. This prevents adding session statistics in WiredTiger without addressing that statistic in the server. Here is an example from &lt;a href=&quot;https://jira.mongodb.org/browse/WT-8848&quot; title=&quot;Add API to roll back and indicate that a transaction has exceeded a configurable limit of pinned dirty data&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-8848&quot;&gt;&lt;del&gt;WT-8848&lt;/del&gt;&lt;/a&gt;:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/WT-8848&quot; title=&quot;Add API to roll back and indicate that a transaction has exceeded a configurable limit of pinned dirty data&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-8848&quot;&gt;&lt;del&gt;WT-8848&lt;/del&gt;&lt;/a&gt; wants to add a new statistic, bytes dirtied by a transaction. But doing so trips &lt;a href=&quot;https://github.com/mongodb/mongo/blob/112d3349db7bb2bc1bb7f6a6cdd7dd1d89f3f423/src/mongo/db/storage/wiredtiger/wiredtiger_recovery_unit.cpp#L135&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the invariant&lt;/a&gt; in the server as there is a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/112d3349db7bb2bc1bb7f6a6cdd7dd1d89f3f423/src/mongo/db/storage/wiredtiger/wiredtiger_recovery_unit.cpp#L87-L94&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;hard coded map&lt;/a&gt; between server&apos;s expectation and the sessions statistics.&lt;/p&gt;

&lt;p&gt;Also, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/112d3349db7bb2bc1bb7f6a6cdd7dd1d89f3f423/src/mongo/db/storage/wiredtiger/wiredtiger_recovery_unit.cpp#L124&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;fetching the statistics&lt;/a&gt; causes all the stats to be reset to 0. This is okay when there is one operation per transaction. In the case of MongoDB multi-doc transactions, there could be several WiredTiger operations at the end of which these stats get reset to 0. The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/112d3349db7bb2bc1bb7f6a6cdd7dd1d89f3f423/src/mongo/db/transaction/transaction_metrics_observer.cpp#L193&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;server accumulates these stats for the purpose of logging&lt;/a&gt;. If we were to decouple the slow operation stats known to the server from the WiredTiger&apos;s session statistics, we will have to make sure there is a workaround for not mistakenly resetting all the statistics to zero. So, in this case, the dirtied bytes by the transaction should not be reset to zero until the end of the multi-doc transaction.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="2111696">SERVER-68739</key>
            <summary>Add WiredTiger session statistic without affecting slow op statistics</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="yujin.kang@mongodb.com">Yujin Kang Park</assignee>
                                    <reporter username="sulabh.mahajan@mongodb.com">Sulabh Mahajan</reporter>
                        <labels>
                    </labels>
                <created>Thu, 11 Aug 2022 15:38:22 +0000</created>
                <updated>Sun, 29 Oct 2023 21:34:38 +0000</updated>
                            <resolved>Mon, 21 Nov 2022 10:14:35 +0000</resolved>
                                                    <fixVersion>5.0.15</fixVersion>
                    <fixVersion>6.2.0-rc2</fixVersion>
                    <fixVersion>6.3.0-rc0</fixVersion>
                    <fixVersion>6.0.5</fixVersion>
                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="5132892" author="xgen-internal-githook" created="Mon, 23 Jan 2023 14:10:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Yu Jin Kang Park&apos;, &apos;email&apos;: &apos;yujin.kang@mongodb.com&apos;, &apos;username&apos;: &apos;ykangpark&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-68739&quot; title=&quot;Add WiredTiger session statistic without affecting slow op statistics&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-68739&quot;&gt;&lt;del&gt;SERVER-68739&lt;/del&gt;&lt;/a&gt; Do not reset WT session stats when fetching op stats&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 007aef8fa15b3c54019708ddaa36098d61462e06)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/52e0ccbe64eb8f5cebe1c2446dfffbba0b784a5c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/52e0ccbe64eb8f5cebe1c2446dfffbba0b784a5c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5118389" author="xgen-internal-githook" created="Tue, 17 Jan 2023 18:00:42 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Yu Jin Kang Park&apos;, &apos;email&apos;: &apos;yujin.kang@mongodb.com&apos;, &apos;username&apos;: &apos;ykangpark&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-68739&quot; title=&quot;Add WiredTiger session statistic without affecting slow op statistics&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-68739&quot;&gt;&lt;del&gt;SERVER-68739&lt;/del&gt;&lt;/a&gt; Do not reset WT session stats when fetching op stats&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 007aef8fa15b3c54019708ddaa36098d61462e06)&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e28b9fd374a474b2270737607a9408b04cb09677&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e28b9fd374a474b2270737607a9408b04cb09677&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5015903" author="xgen-internal-githook" created="Tue, 29 Nov 2022 18:03:44 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Yu Jin Kang Park&apos;, &apos;email&apos;: &apos;yujin.kang@mongodb.com&apos;, &apos;username&apos;: &apos;ykangpark&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-68739&quot; title=&quot;Add WiredTiger session statistic without affecting slow op statistics&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-68739&quot;&gt;&lt;del&gt;SERVER-68739&lt;/del&gt;&lt;/a&gt; Do not reset WT session stats when fetching op stats&lt;br/&gt;
Branch: v6.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8045c4a7772ab588679cdbf604a2875c27d97251&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8045c4a7772ab588679cdbf604a2875c27d97251&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4996341" author="xgen-internal-githook" created="Mon, 21 Nov 2022 10:10:06 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Yu Jin Kang Park&apos;, &apos;email&apos;: &apos;yujin.kang@mongodb.com&apos;, &apos;username&apos;: &apos;ykangpark&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-68739&quot; title=&quot;Add WiredTiger session statistic without affecting slow op statistics&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-68739&quot;&gt;&lt;del&gt;SERVER-68739&lt;/del&gt;&lt;/a&gt; Do not reset WT session stats when fetching op stats&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/007aef8fa15b3c54019708ddaa36098d61462e06&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/007aef8fa15b3c54019708ddaa36098d61462e06&lt;/a&gt;&lt;/p&gt;</comment>
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