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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-74684] Size storer not being flushed periodically</title>
                <link>https://jira.mongodb.org/browse/SERVER-74684</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It appears that the size storer isn&apos;t writing to the &lt;tt&gt;sizeStorer&lt;/tt&gt; table periodically like it should be, either based on number of inserts or on amount of time elapsed.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2283537">SERVER-74684</key>
            <summary>Size storer not being flushed periodically</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="dianna.hohensee@mongodb.com">Dianna Hohensee</assignee>
                                    <reporter username="gregory.noma@mongodb.com">Gregory Noma</reporter>
                        <labels>
                    </labels>
                <created>Tue, 7 Mar 2023 21:55:49 +0000</created>
                <updated>Fri, 12 Jan 2024 17:01:01 +0000</updated>
                            <resolved>Mon, 3 Apr 2023 13:03:24 +0000</resolved>
                                    <version>6.2.0-rc0</version>
                    <version>6.3.0-rc0</version>
                                    <fixVersion>7.0.0-rc0</fixVersion>
                    <fixVersion>6.3.1</fixVersion>
                                                        <votes>0</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="5348723" author="xgen-internal-githook" created="Fri, 14 Apr 2023 18:54:53 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Dianna Hohensee&apos;, &apos;email&apos;: &apos;dianna.hohensee@mongodb.com&apos;, &apos;username&apos;: &apos;DiannaHohensee&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74684&quot; title=&quot;Size storer not being flushed periodically&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74684&quot;&gt;&lt;del&gt;SERVER-74684&lt;/del&gt;&lt;/a&gt; Return logic to periodically flush the size storer&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 23f1d4b9a6cef4550be9f936c7d62547dac32945)&lt;br/&gt;
Branch: v6.3&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/28abbf6dc6faef55d8b9c08f4aeadcc649244eb8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/28abbf6dc6faef55d8b9c08f4aeadcc649244eb8&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5326513" author="dianna.hohensee" created="Wed, 5 Apr 2023 13:51:30 +0000"  >&lt;p&gt;Backups look like they are smart about calling syncSizeInfo: all the backup functions &#8211; e.g. &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f3ba48c674d343482a4e43d6ff1ab9e0da339c5f/src/mongo/db/storage/wiredtiger/wiredtiger_kv_engine.cpp#L961&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;beginBackup&lt;/a&gt;, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f3ba48c674d343482a4e43d6ff1ab9e0da339c5f/src/mongo/db/storage/wiredtiger/wiredtiger_kv_engine.cpp#L1327&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;extendBackupCursor&lt;/a&gt; &#8211; in the WiredTigerKVEngine appear to call sync before running. &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f3ba48c674d343482a4e43d6ff1ab9e0da339c5f/src/mongo/db/storage/wiredtiger/wiredtiger_kv_engine.cpp#L2327&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;recoverToStableTimestamp&lt;/a&gt; as well. Clean shutdown still syncs as always, too, to be clear.&lt;/p&gt;</comment>
                            <comment id="5326486" author="dianna.hohensee" created="Wed, 5 Apr 2023 13:45:45 +0000"  >&lt;p&gt;Ah, my bad, I didn&apos;t originally think of v6.3. We&apos;ve got a backport to v6.3 scheduled.&lt;/p&gt;

&lt;p&gt;Collection counts and data sizes were and are again only flushed to storage every 60 seconds or roughly 100,000 writes, whichever is sooner. The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9af5ea7564a94ecb47dc25b66b196d0073d080f1/src/mongo/db/storage/wiredtiger/wiredtiger_kv_engine.cpp#L318&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;periodic trigger&lt;/a&gt; is either 100,000 sync checks (called by &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9af5ea7564a94ecb47dc25b66b196d0073d080f1/src/mongo/db/storage/wiredtiger/wiredtiger_session_cache.cpp#L525&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;WTSessionCache::releaseSession()&lt;/a&gt;) or 60 seconds (but then a write has to call WTSessionCache::releaseSession() to provoke the sync check).&lt;/p&gt;

&lt;p&gt;Yes, I think v6.3 servers will have very inaccurate counts and data sizes if they were running for a while, receiving a lot of writes, and there was an unclean shutdown. 60 seconds / 100,000 writes periods can also result in quite a bit of skew.&lt;/p&gt;</comment>
                            <comment id="5324559" author="milkie" created="Tue, 4 Apr 2023 19:45:12 +0000"  >&lt;p&gt;Also does this mean any unclean shutdowns, or backup snapshots, now can have exceedingly inaccurate collection counts and data sizes, whereas before they were only inaccurate to approximately a second&apos;s worth of writes?&lt;/p&gt;</comment>
                            <comment id="5324545" author="milkie" created="Tue, 4 Apr 2023 19:43:38 +0000"  >&lt;p&gt;I&apos;m confused. &#160;Can someone fill in an accurate &quot;Affects Versions&quot; field for this ticket? &#160;Dianna says in a comment that it &quot;only changed in v7.0&quot;, but this ticket is also linked as &quot;caused by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-69363&quot; title=&quot;Ident reaper to handle failed ident drops&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-69363&quot;&gt;&lt;del&gt;SERVER-69363&lt;/del&gt;&lt;/a&gt;&quot;, which was released in 6.2.&lt;/p&gt;</comment>
                            <comment id="5317046" author="xgen-internal-githook" created="Fri, 31 Mar 2023 23:43:55 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Dianna Hohensee&apos;, &apos;email&apos;: &apos;dianna.hohensee@mongodb.com&apos;, &apos;username&apos;: &apos;DiannaHohensee&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74684&quot; title=&quot;Size storer not being flushed periodically&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74684&quot;&gt;&lt;del&gt;SERVER-74684&lt;/del&gt;&lt;/a&gt; Return logic to periodically flush the size storer&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/23f1d4b9a6cef4550be9f936c7d62547dac32945&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/23f1d4b9a6cef4550be9f936c7d62547dac32945&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5310263" author="dianna.hohensee" created="Wed, 29 Mar 2023 19:46:36 +0000"  >&lt;p&gt;Some good news. It looks like this only changed in v7.0. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-69363&quot; title=&quot;Ident reaper to handle failed ident drops&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-69363&quot;&gt;&lt;del&gt;SERVER-69363&lt;/del&gt;&lt;/a&gt; removed some code that appears to (very) sneakily trigger flushes.&lt;/p&gt;

&lt;p&gt;When a session is released (WTSessionCache code), there is a check about &lt;a href=&quot;https://github.com/mongodb/mongo/blob/1a8f5ae47b2cd941b96cf8795fa45a167ac4fbeb/src/mongo/db/storage/wiredtiger/wiredtiger_session_cache.cpp#L553-L554&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;dropping some queued idents&lt;/a&gt; &amp;#8211; I&apos;m not familiar with what the purpose of this code is, it appears to have originated when integration for WT was added way back when. And then in the check to see whether there are idents queued to drop, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/1a8f5ae47b2cd941b96cf8795fa45a167ac4fbeb/src/mongo/db/storage/wiredtiger/wiredtiger_kv_engine.cpp#L1910-L1913&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the sizeStorer is flushed&lt;/a&gt; on a periodic basis.&lt;/p&gt;</comment>
                    </comments>
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