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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-25974] Application threads stall for extended period when cache fills</title>
                <link>https://jira.mongodb.org/browse/SERVER-25974</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Under some conditions when cache utilization reaches 100%, the system can go into a state where&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;operation rate falls to near-zero levels&lt;/li&gt;
	&lt;li&gt;application threads stall for tens of seconds, apparently attempting but not succeeding in evicting pages.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;This state can persist for many minutes.&lt;/p&gt;</description>
                <environment></environment>
        <key id="314402">SERVER-25974</key>
            <summary>Application threads stall for extended period when cache fills</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="alexander.gorrod@mongodb.com">Alexander Gorrod</assignee>
                                    <reporter username="bruce.lucas@mongodb.com">Bruce Lucas</reporter>
                        <labels>
                            <label>code-only</label>
                    </labels>
                <created>Tue, 6 Sep 2016 19:22:35 +0000</created>
                <updated>Tue, 31 Jul 2018 10:15:03 +0000</updated>
                            <resolved>Wed, 28 Sep 2016 19:55:50 +0000</resolved>
                                    <version>3.2.9</version>
                    <version>3.3.10</version>
                                    <fixVersion>3.2.10</fixVersion>
                    <fixVersion>3.3.15</fixVersion>
                                    <component>WiredTiger</component>
                                        <votes>3</votes>
                                    <watches>30</watches>
                                                                                                                <comments>
                            <comment id="1396078" author="ramon.fernandez" created="Wed, 28 Sep 2016 19:55:50 +0000"  >&lt;p&gt;The underlying technical problem was addressed in &lt;a href=&quot;https://jira.mongodb.org/browse/WT-2924&quot; title=&quot;Ensure we are doing eviction when threads are waiting for it&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-2924&quot;&gt;&lt;del&gt;WT-2924&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="1378563" author="bruce.lucas@10gen.com" created="Wed, 7 Sep 2016 17:06:11 +0000"  >&lt;p&gt;There is a simple insert workload that shows a similar problem; I opened &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26001&quot; title=&quot;Insert workload stalled at 96% cache utilization&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26001&quot;&gt;&lt;del&gt;SERVER-26001&lt;/del&gt;&lt;/a&gt; to track that. The problem is similar in that ops are stalled for an extended period. However there are some differences that make it unclear whether the issues are in fact the same.&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;here: cache utilization is 100%; there: stuck at 96%&lt;/li&gt;
	&lt;li&gt;here: application threads appear to be getting plenty of work to do but the attempted evictions are failing; there: application threads appear to be starved of work to do.&lt;/li&gt;
	&lt;li&gt;here: complex customer workload; there: simple synthetic insert-only workload&lt;/li&gt;
&lt;/ul&gt;
</comment>
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                <issuelinks>
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                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="314673">SERVER-26001</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="315419">SERVER-26055</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="325176">SERVER-26700</issuekey>
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            <issuekey id="317723">WT-2924</issuekey>
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                                        <issuelink>
            <issuekey id="314167">WT-2894</issuekey>
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                <attachments>
                            <attachment id="139228" name="3.2.10-rc0-timeseries.png" size="279662" author="michael.cahill@mongodb.com" created="Wed, 21 Sep 2016 11:33:53 +0000"/>
                            <attachment id="138896" name="3.2.10-rc0_event.png" size="233089" author="dmitry.agranat@mongodb.com" created="Sun, 18 Sep 2016 09:36:16 +0000"/>
                            <attachment id="139229" name="3.2.10-rc1-timeseries.png" size="262593" author="michael.cahill@mongodb.com" created="Wed, 21 Sep 2016 11:33:53 +0000"/>
                            <attachment id="138897" name="Screen Shot 2016-09-18 at 2.18.01 PM.png" size="325974" author="dmitry.agranat@mongodb.com" created="Sun, 18 Sep 2016 11:19:37 +0000"/>
                            <attachment id="138902" name="Screen Shot 2016-09-18 at 4.38.53 PM.png" size="197864" author="dmitry.agranat@mongodb.com" created="Sun, 18 Sep 2016 13:41:19 +0000"/>
                            <attachment id="137940" name="issue.png" size="221230" author="bruce.lucas@mongodb.com" created="Thu, 8 Sep 2016 17:57:51 +0000"/>
                            <attachment id="137941" name="repro.png" size="233581" author="bruce.lucas@mongodb.com" created="Thu, 8 Sep 2016 17:57:51 +0000"/>
                            <attachment id="138930" name="s25974_new_connections.png" size="64532" author="alexander.gorrod@mongodb.com" created="Mon, 19 Sep 2016 04:53:41 +0000"/>
                            <attachment id="138929" name="s25974_oplog_cache.png" size="60622" author="alexander.gorrod@mongodb.com" created="Mon, 19 Sep 2016 04:51:06 +0000"/>
                            <attachment id="138931" name="s25974_seen_queue.png" size="72061" author="alexander.gorrod@mongodb.com" created="Mon, 19 Sep 2016 05:06:24 +0000"/>
                            <attachment id="139230" name="server-25974-rc0-vs-rc1-dd.tgz" size="16213229" author="michael.cahill@mongodb.com" created="Wed, 21 Sep 2016 11:33:53 +0000"/>
                            <attachment id="137970" name="test5-io-saturation.png" size="196354" author="michael.cahill@mongodb.com" created="Fri, 9 Sep 2016 02:32:32 +0000"/>
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