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        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-20063] WiredTiger collection size cache can be inaccurate </title>
                <link>https://jira.mongodb.org/browse/SERVER-20063</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The code to handle &quot;negative&quot; sizes seems to have several issues.&lt;/p&gt;

&lt;p&gt;1. We can return size of things that aren&apos;t committed and possibly nonsensical to users (eg negative values).&lt;br/&gt;
2. There&apos;s races in things doing fetch then store. Data is lost if someone updates before the store&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;  if (_numRecords.fetchAndAdd(diff) &amp;lt; 0)&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        _numRecords.store(diff);&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;3. Tradeoffs of not being able to see your own uncommited changes vs everyone else being able to see your uncommited changes - I think we took the wrong path here, and would be better to update on commit. Need to further consider implications.&lt;br/&gt;
4. If we update on commit, need to do something about when we cap collections&lt;/p&gt;</description>
                <environment></environment>
        <key id="226468">SERVER-20063</key>
            <summary>WiredTiger collection size cache can be inaccurate </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="3">Duplicate</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="martin.bligh">Martin Bligh</reporter>
                        <labels>
                    </labels>
                <created>Thu, 20 Aug 2015 18:06:42 +0000</created>
                <updated>Tue, 6 Dec 2022 04:45:45 +0000</updated>
                            <resolved>Mon, 15 Apr 2019 20:48:48 +0000</resolved>
                                                                    <component>WiredTiger</component>
                                        <votes>1</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="1205771" author="thomas.schubert" created="Wed, 16 Mar 2016 18:52:34 +0000"  >&lt;p&gt;I&apos;ve attached a jstest that reproduces some of the behavior described in this ticket.&lt;/p&gt;</comment>
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                            <issuelinktype id="10010">
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            <issuekey id="288868">SERVER-24266</issuekey>
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            <issuekey id="272281">SERVER-23124</issuekey>
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                            <attachment id="113812" name="negativeSize.js" size="2089" author="kelsey.schubert@mongodb.com" created="Wed, 16 Mar 2016 18:52:34 +0000"/>
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