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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-41016] Calculate deltas for updates to large documents</title>
                <link>https://jira.mongodb.org/browse/SERVER-41016</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Use &lt;tt&gt;wiredtiger_calc_modify&lt;/tt&gt; to calculate deltas for size-changing updates to large documents.&lt;/p&gt;</description>
                <environment></environment>
        <key id="758591">SERVER-41016</key>
            <summary>Calculate deltas for updates to large documents</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="michael.cahill@mongodb.com">Michael Cahill</assignee>
                                    <reporter username="michael.cahill@mongodb.com">Michael Cahill</reporter>
                        <labels>
                    </labels>
                <created>Mon, 6 May 2019 03:52:29 +0000</created>
                <updated>Sun, 29 Oct 2023 22:21:18 +0000</updated>
                            <resolved>Thu, 23 May 2019 23:08:58 +0000</resolved>
                                                    <fixVersion>3.6.14</fixVersion>
                    <fixVersion>4.1.12</fixVersion>
                    <fixVersion>4.0.11</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="2352203" author="xgen-internal-githook" created="Wed, 31 Jul 2019 13:48:20 +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-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; Calculate deltas for updates to large documents.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 0d16c757b7badfcadac2a6794525f3c41a621a07)&lt;br/&gt;
(cherry picked from commit 98285cd9c36ac995a0207012c6742c2cefc03dd4)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e01b2ea5d1ecb076159a2e260524c2a2e381d36d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e01b2ea5d1ecb076159a2e260524c2a2e381d36d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2322231" author="xgen-internal-githook" created="Fri, 12 Jul 2019 01:57:35 +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-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; Calculate deltas for updates to large documents.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 0d16c757b7badfcadac2a6794525f3c41a621a07)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/98285cd9c36ac995a0207012c6742c2cefc03dd4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/98285cd9c36ac995a0207012c6742c2cefc03dd4&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2258606" author="xgen-internal-githook" created="Thu, 23 May 2019 22:51:34 +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-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; Calculate deltas for updates to large documents.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0d16c757b7badfcadac2a6794525f3c41a621a07&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0d16c757b7badfcadac2a6794525f3c41a621a07&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2235073" author="michael.cahill" created="Mon, 6 May 2019 12:04:48 +0000"  >&lt;p&gt;This turned up a real bug: WiredTiger&apos;s existing semantics for modifications assumes that results are committed in timestamp order.  In &lt;tt&gt;_mdb_catalog&lt;/tt&gt;, where updates are performed out of timestamp order, a subset of modifications would be applied, leading to invalid BSON being returned.  I&apos;ll change the WT semantic to give the expected results.&lt;/p&gt;</comment>
                    </comments>
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