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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-19136] oplog seems to slow down everything</title>
                <link>https://jira.mongodb.org/browse/SERVER-19136</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We are using mongodb v3.0.1 and v3.0.3 for two different replSets, each consisting of 3 physical members. Both are using wiredTiger with defaults settings. After some weeks of normal operation, we observed that queries became significantly slower. &lt;/p&gt;

&lt;p&gt;By analyzing the log files with &lt;a href=&quot;https://github.com/rueckstiess/mtools/wiki/mlogvis&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mlogvis&lt;/a&gt;, we found an unusal high amount of operations on the oplog which did not exists before the slowdown. The longest oplog queries took up to 12 seconds!&lt;br/&gt;
Our &quot;solution&quot; was to stepDown the primary, which immediately brought back the replSet to normal speed. 90 minutes later we elected the old (slow) primary again to see whether the problem is reproduceable or not. Until now all is running fast as usual.&lt;/p&gt;

&lt;p&gt;Please see attached two screenshots produced by &lt;a href=&quot;https://github.com/rueckstiess/mtools/wiki/mlogvis&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mlogvis&lt;/a&gt;. On the first you can clearly see the long during queries on local.oplog.rs, the stepDown and the re-election. The second screenshot shows the analyzed log file of yesterday, where all was still normal as usual.&lt;br/&gt;
We can provide the log files if they are kept confidentially.&lt;/p&gt;</description>
                <environment></environment>
        <key id="213067">SERVER-19136</key>
            <summary>oplog seems to slow down everything</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="ramon.fernandez@mongodb.com">Ramon Fernandez Marina</assignee>
                                    <reporter username="kay.agahd@idealo.de">Kay Agahd</reporter>
                        <labels>
                    </labels>
                <created>Thu, 25 Jun 2015 17:23:11 +0000</created>
                <updated>Thu, 30 Jul 2015 21:08:40 +0000</updated>
                            <resolved>Thu, 30 Jul 2015 20:21:25 +0000</resolved>
                                    <version>3.0.1</version>
                    <version>3.0.3</version>
                                                    <component>Performance</component>
                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="993350" author="kay.agahd@idealo.de" created="Thu, 30 Jul 2015 21:08:40 +0000"  >&lt;p&gt;This is great news, thanks Ramon &amp;amp; team! &lt;br/&gt;
I&apos;ll put v3.0.5 in production as soon as possible.&lt;/p&gt;</comment>
                            <comment id="993304" author="ramon.fernandez" created="Thu, 30 Jul 2015 20:21:05 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kay.agahd%40idealo.de&quot; class=&quot;user-hover&quot; rel=&quot;kay.agahd@idealo.de&quot;&gt;kay.agahd@idealo.de&lt;/a&gt;, this is to let you know that MongoDB 3.0.5 was released earlier this week; I&apos;d encourage you to try using it and report back if the oplog performance issues persist. I&apos;m going to close this ticket as a duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-18875&quot; title=&quot;Oplog performance on WT degrades over time after accumulation of deleted items&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-18875&quot;&gt;&lt;del&gt;SERVER-18875&lt;/del&gt;&lt;/a&gt; &amp;#8211; but please feel free to open new tickets if you run into other issues.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
                            <comment id="956427" author="kay.agahd@idealo.de" created="Thu, 2 Jul 2015 06:40:40 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ramon.fernandez&quot; class=&quot;user-hover&quot; rel=&quot;ramon.fernandez&quot;&gt;ramon.fernandez&lt;/a&gt;, good to know that this issue might be fixed already in the next release. Thanks!&lt;/p&gt;</comment>
                            <comment id="955794" author="ramon.fernandez" created="Wed, 1 Jul 2015 16:49:29 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kay.agahd%40idealo.de&quot; class=&quot;user-hover&quot; rel=&quot;kay.agahd@idealo.de&quot;&gt;kay.agahd@idealo.de&lt;/a&gt;, thanks for your report. This may be the same issue reported in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-18875&quot; title=&quot;Oplog performance on WT degrades over time after accumulation of deleted items&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-18875&quot;&gt;&lt;del&gt;SERVER-18875&lt;/del&gt;&lt;/a&gt;, which is actively worked on and already includes improvements scheduled for both the next stable and the next development releases. I&apos;d encourage you to watch &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-18875&quot; title=&quot;Oplog performance on WT degrades over time after accumulation of deleted items&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-18875&quot;&gt;&lt;del&gt;SERVER-18875&lt;/del&gt;&lt;/a&gt; for updates, and most probably we&apos;ll ask you to re-check this behavior with 3.0.5 when it&apos;s released later this month.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
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                            <attachment id="79531" name="_25-06-2015_19-14.jpeg" size="254395" author="kay.agahd@idealo.de" created="Thu, 25 Jun 2015 17:23:11 +0000"/>
                            <attachment id="79532" name="_25-06-2015_19-15.jpeg" size="168875" author="kay.agahd@idealo.de" created="Thu, 25 Jun 2015 17:23:11 +0000"/>
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