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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-41913] Avoid in-place modify operations for logged collections</title>
                <link>https://jira.mongodb.org/browse/SERVER-41913</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41016&quot; title=&quot;Calculate deltas for updates to large documents&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41016&quot;&gt;&lt;del&gt;SERVER-41016&lt;/del&gt;&lt;/a&gt;, we enabled functionality in WiredTiger to represent changes to documents as deltas in cache and in the WiredTiger log (aka journal).  That change was primarily aimed at replicated workloads, so the cache pressure more closely matches the size of operations in the oplog.&lt;/p&gt;

&lt;p&gt;However, this is the first time we are using size-changing deltas in MongoDB, which is also the first operation that is not idempotent in WiredTiger&apos;s log.  There have been several test failures that could be explained by such operations being applied by WiredTiger recovery on top of data that already includes the change.&lt;/p&gt;

&lt;p&gt;Disable the new modify functionality for collections that rely on the WiredTiger log for recovery.  This should not matter for the original cases &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41016&quot; title=&quot;Calculate deltas for updates to large documents&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41016&quot;&gt;&lt;del&gt;SERVER-41016&lt;/del&gt;&lt;/a&gt; was intended to address.&lt;/p&gt;</description>
                <environment></environment>
        <key id="814028">SERVER-41913</key>
            <summary>Avoid in-place modify operations for logged collections</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="michael.cahill@mongodb.com">Michael Cahill</assignee>
                                    <reporter username="michael.cahill@mongodb.com">Michael Cahill</reporter>
                        <labels>
                    </labels>
                <created>Tue, 25 Jun 2019 17:25:11 +0000</created>
                <updated>Sun, 29 Oct 2023 22:19:36 +0000</updated>
                            <resolved>Tue, 25 Jun 2019 21:21:11 +0000</resolved>
                                                    <fixVersion>3.6.14</fixVersion>
                    <fixVersion>4.0.11</fixVersion>
                    <fixVersion>4.2.0-rc3</fixVersion>
                    <fixVersion>4.3.1</fixVersion>
                                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2352204" author="xgen-internal-githook" created="Wed, 31 Jul 2019 13:48:23 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Michael Cahill&apos;, &apos;email&apos;: &apos;michael.cahill@mongodb.com&apos;, &apos;username&apos;: &apos;michaelcahill&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41913&quot; title=&quot;Avoid in-place modify operations for logged collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41913&quot;&gt;&lt;del&gt;SERVER-41913&lt;/del&gt;&lt;/a&gt; Avoid in-place modify operations for logged collections.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 8b1d5ef199d881ab4fce61e585006436e9e6d2d1)&lt;br/&gt;
(cherry picked from commit abf661c2657e08a53c4fd13d939b4587ddaf734d)&lt;br/&gt;
(cherry picked from commit b583a5704eaf895facadaf470ddd9cf2bfe6270e)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/201d8b967486df9b9cc0948507b537b520371467&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/201d8b967486df9b9cc0948507b537b520371467&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2322232" author="xgen-internal-githook" created="Fri, 12 Jul 2019 01:57:37 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Michael Cahill&apos;, &apos;username&apos;: &apos;michaelcahill&apos;, &apos;email&apos;: &apos;michael.cahill@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41913&quot; title=&quot;Avoid in-place modify operations for logged collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41913&quot;&gt;&lt;del&gt;SERVER-41913&lt;/del&gt;&lt;/a&gt; Avoid in-place modify operations for logged collections.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 8b1d5ef199d881ab4fce61e585006436e9e6d2d1)&lt;br/&gt;
(cherry picked from commit abf661c2657e08a53c4fd13d939b4587ddaf734d)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b583a5704eaf895facadaf470ddd9cf2bfe6270e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b583a5704eaf895facadaf470ddd9cf2bfe6270e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2298112" author="xgen-internal-githook" created="Wed, 26 Jun 2019 13:48:44 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Michael Cahill&apos;, &apos;username&apos;: &apos;michaelcahill&apos;, &apos;email&apos;: &apos;michael.cahill@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41913&quot; title=&quot;Avoid in-place modify operations for logged collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41913&quot;&gt;&lt;del&gt;SERVER-41913&lt;/del&gt;&lt;/a&gt; Avoid in-place modify operations for logged collections.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 8b1d5ef199d881ab4fce61e585006436e9e6d2d1)&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/abf661c2657e08a53c4fd13d939b4587ddaf734d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/abf661c2657e08a53c4fd13d939b4587ddaf734d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2297519" author="xgen-internal-githook" created="Tue, 25 Jun 2019 21:13:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Michael Cahill&apos;, &apos;email&apos;: &apos;michael.cahill@mongodb.com&apos;, &apos;username&apos;: &apos;michaelcahill&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41913&quot; title=&quot;Avoid in-place modify operations for logged collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41913&quot;&gt;&lt;del&gt;SERVER-41913&lt;/del&gt;&lt;/a&gt; Avoid in-place modify operations for logged collections.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8b1d5ef199d881ab4fce61e585006436e9e6d2d1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8b1d5ef199d881ab4fce61e585006436e9e6d2d1&lt;/a&gt;&lt;/p&gt;</comment>
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