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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>
    </build-info>


<item>
            <title>[SERVER-13444] Long locked flush without inserts and updates</title>
                <link>https://jira.mongodb.org/browse/SERVER-13444</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Every 60 seconds, Mongo stops processing all requests and pauses for X seconds, where X depended on Memory Working Set. For expample, 32GB in Working Set = ~5-8 seconds. Even if there are no inserts and updates.&lt;/p&gt;</description>
                <environment>Windows Server 2008R2 SP1, 128GB RAM, 3TB HHD, 12Cores</environment>
        <key id="128814">SERVER-13444</key>
            <summary>Long locked flush without inserts and updates</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="mark.benvenuto@mongodb.com">Mark Benvenuto</assignee>
                                    <reporter username="ntarasov">Nikita Tarasov</reporter>
                        <labels>
                            <label>flush</label>
                            <label>lock</label>
                    </labels>
                <created>Tue, 1 Apr 2014 18:40:25 +0000</created>
                <updated>Tue, 8 Jul 2014 15:54:03 +0000</updated>
                            <resolved>Tue, 8 Jul 2014 15:54:03 +0000</resolved>
                                    <version>2.4.9</version>
                    <version>2.6.0-rc2</version>
                                                    <component>Performance</component>
                                        <votes>0</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="535282" author="ntarasov" created="Fri, 4 Apr 2014 06:00:04 +0000"  >&lt;p&gt;I attached performance counter trace&lt;/p&gt;</comment>
                            <comment id="534758" author="mark.benvenuto" created="Thu, 3 Apr 2014 20:53:16 +0000"  >&lt;p&gt;I would also like a performance counter trace to understand why it is running so slow. You will need to run the following commands, and it will collect a trace file for 15 minutes of 1 second samples, and then stop. After it stops, attach the information to the ticket so understand how much write traffic there is and if is particularly high disk latency from your storage system in the first place.&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;
		&lt;tbody &gt;
				&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;logman delete mongodb_log&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;   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;logman create counter mongodb_log -c &quot;\Processor(_Total)\% Processor Time&quot; &quot;\Processor(_Total)\% Privileged Time&quot; &quot;\PhysicalDisk(_Total)\*&quot; -f bin -rf 00:15:00 -si 1 -ow&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;logman start mongodb_log&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;later run&lt;/p&gt;

&lt;p&gt;logman query mongodb_log to find the file(s), zip and attach to jira&lt;/p&gt;</comment>
                            <comment id="533638" author="ntarasov" created="Thu, 3 Apr 2014 05:22:05 +0000"  >&lt;p&gt;Hi Thomas,&lt;/p&gt;

&lt;p&gt;I attached log file(about 10 minutes with logLevel=5) of one of nodes. &lt;/p&gt;
</comment>
                            <comment id="532900" author="thomasr" created="Wed, 2 Apr 2014 17:29:39 +0000"  >&lt;p&gt;Hi Nikita,&lt;/p&gt;

&lt;p&gt;This is probably related to the flushing of memory mapped files to disk, which happens every 60 seconds, but we would need the mongod log file of one of the affected nodes to diagnose further. Can you attach one to the ticket please? &lt;/p&gt;

&lt;p&gt;Thanks&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
                            <comment id="531409" author="ntarasov" created="Tue, 1 Apr 2014 18:54:21 +0000"  >&lt;p&gt;Sorry, real mongostat log in attached file&lt;/p&gt;

&lt;p&gt;MMS info:&lt;br/&gt;
Group: Normativ&lt;br/&gt;
Hosts: NORMATIV-back1, NORMATIV-back2, NORMATIV-back3&lt;/p&gt;</comment>
                    </comments>
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                                        <issuelink>
            <issuekey id="132661">SERVER-13681</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="133203">SERVER-13725</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="133228">SERVER-13729</issuekey>
        </issuelink>
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            <issuekey id="86851">SERVER-10591</issuekey>
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            <issuekey id="78098">SERVER-9868</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="114461">SERVER-12880</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="106610">SERVER-12401</issuekey>
        </issuelink>
                            </inwardlinks>
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                <attachments>
                            <attachment id="40865" name="mongod.log.2014-04-03T05-17-46" size="2872891" author="ntarasov" created="Thu, 3 Apr 2014 05:19:44 +0000"/>
                            <attachment id="40963" name="mongodb_log_000001.7z" size="139758" author="ntarasov" created="Fri, 4 Apr 2014 05:53:58 +0000"/>
                            <attachment id="40729" name="mongostat log.txt" size="54418" author="ntarasov" created="Tue, 1 Apr 2014 18:46:59 +0000"/>
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