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    <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-16941] Cache can grow indefinitely under WiredTiger</title>
                <link>https://jira.mongodb.org/browse/SERVER-16941</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;During a 20-minute run with heavy mixed workload the cache was observed to grow on occasion (2 runs out of about 30) to almost 9 GB, compared to a configured value of 5 GB. An assortment of potentially relevant metrics:&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/62223/62223_cache-grows-indefinitely.png&quot; width=&quot;900&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;at point B the checkpoint enters the second phase where &quot;range of ids pinned&quot; grows.&lt;/li&gt;
	&lt;li&gt;at this point bytes in cache starts growing, and continues growing, apparently indefinitely.&lt;/li&gt;
	&lt;li&gt;at C we begin to page performance declines correspondingly.&lt;/li&gt;
	&lt;li&gt;if run continued beyond 20 minutes growth would have likely resulted on being killed by OOM killer.&lt;/li&gt;
	&lt;li&gt;checkpoint is running longer than it did in runs that didn&apos;t experience the issue - typically that third checkpoint completed before the end of the run.&lt;/li&gt;
	&lt;li&gt;the spike in reported cached bytes at A, without corresponding increase in VM, is probably the apparent accounting error from &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16881&quot; title=&quot;Pause due to sudden 4GB increase in cached bytes under WiredTiger&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16881&quot;&gt;&lt;del&gt;SERVER-16881&lt;/del&gt;&lt;/a&gt;, which is seen to occur frequently in these runs. However the increase starting at B that is the subject of this ticket is accompanied by an increase in VM, so is likely an unrelated issue.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="179643">SERVER-16941</key>
            <summary>Cache can grow indefinitely under WiredTiger</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="9">Done</resolution>
                                        <assignee username="bruce.lucas@mongodb.com">Bruce Lucas</assignee>
                                    <reporter username="bruce.lucas@mongodb.com">Bruce Lucas</reporter>
                        <labels>
                            <label>wiredtiger</label>
                            <label>wttt</label>
                    </labels>
                <created>Tue, 20 Jan 2015 16:37:59 +0000</created>
                <updated>Thu, 14 Apr 2016 15:17:48 +0000</updated>
                            <resolved>Tue, 21 Jul 2015 22:16:13 +0000</resolved>
                                    <version>2.8.0-rc5</version>
                                                    <component>Storage</component>
                    <component>WiredTiger</component>
                                        <votes>1</votes>
                                    <watches>14</watches>
                                                                                                                <comments>
                            <comment id="971569" author="dan@10gen.com" created="Tue, 21 Jul 2015 22:16:13 +0000"  >&lt;p&gt;This issue has been fixed in subsequent releases.&lt;/p&gt;</comment>
                            <comment id="953348" author="ian@10gen.com" created="Mon, 29 Jun 2015 17:00:37 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=bruce.lucas%4010gen.com&quot; class=&quot;user-hover&quot; rel=&quot;bruce.lucas@10gen.com&quot;&gt;bruce.lucas@10gen.com&lt;/a&gt; do you believe this has been fixed?  If so, do you know of a particular change in MongoDB or WiredTiger that we believe fixed the issue?&lt;/p&gt;</comment>
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                <issuelinks>
                            <issuelinktype id="10012">
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                                            <outwardlinks description="related to">
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            <issuekey id="180029">SERVER-16977</issuekey>
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                                        <issuelink>
            <issuekey id="180174">SERVER-16997</issuekey>
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                            <attachment id="62223" name="cache-grows-indefinitely.png" size="403203" author="bruce.lucas@mongodb.com" created="Tue, 20 Jan 2015 16:37:59 +0000"/>
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