<!-- 
RSS generated by JIRA (9.7.1#970001-sha1:2222b88b221c4928ef0de3161136cc90c8356a66) at Thu Feb 08 05:25:30 UTC 2024

It is possible to restrict the fields that are returned in this document by specifying the 'field' parameter in your request.
For example, to request only the issue key and summary append 'field=key&field=summary' to the URL of your request.
-->
<rss version="0.92" >
<channel>
    <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-51449] Mongodb unusually high iops during fsync mongoversion 3.2.10</title>
                <link>https://jira.mongodb.org/browse/SERVER-51449</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;we have mongodb with 1 primary and 2 secondaries. On primary node the disk write iops are spiking every minute and latencies go up.&lt;br/&gt;
Looking further write iops seems like a bottle neck. so we reduced the fsyc time to 10 sec from 60 sec (default).&lt;/p&gt;

&lt;p&gt;It has helped us a lot but still the write iops on 60 qps update are around 1300 in every fsync.&lt;/p&gt;

&lt;p&gt;I did a test on another mongodb instance, on 1300 qps 363 iop we used during fsync (every 30 sec).&lt;/p&gt;

&lt;p&gt;the major difference between 2 mongos is the db size. IOPS in my mongo seems like an exceptional.&lt;/p&gt;

&lt;p&gt;I want to understand how db size impacts write iops during fsync. (In my understanding it should not have).&lt;br/&gt;
What other factors are there in fsync write iops?&lt;br/&gt;
what data should i be looking at?&lt;/p&gt;</description>
                <environment></environment>
        <key id="1508374">SERVER-51449</key>
            <summary>Mongodb unusually high iops during fsync mongoversion 3.2.10</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="edwin.zhou@mongodb.com">Edwin Zhou</assignee>
                                    <reporter username="c.programming.doubts@gmail.com">maneesh bhunwal</reporter>
                        <labels>
                    </labels>
                <created>Fri, 9 Oct 2020 06:17:26 +0000</created>
                <updated>Tue, 20 Oct 2020 14:59:37 +0000</updated>
                            <resolved>Tue, 20 Oct 2020 14:59:36 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="3454082" author="JIRAUSER1257066" created="Tue, 20 Oct 2020 14:59:37 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=c.programming.doubts%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;c.programming.doubts@gmail.com&quot;&gt;c.programming.doubts@gmail.com&lt;/a&gt;, I&apos;m happy to hear that you were able to resolve the issue. I&apos;ll be closing the ticket as requested.&lt;/p&gt;

&lt;p&gt;Best,&lt;br/&gt;
 Edwin&lt;/p&gt;</comment>
                            <comment id="3452139" author="JIRAUSER1257199" created="Mon, 19 Oct 2020 15:49:23 +0000"  >&lt;p&gt;We were able to reproduce the issue on a much smaller data set, hence it seems like a constrain only. I am sorry i can not share any data due to some constrains. Please feel free to close this ticket.&lt;/p&gt;

&lt;p&gt;Thanks for spending your time on this.&lt;/p&gt;</comment>
                            <comment id="3452059" author="JIRAUSER1257066" created="Mon, 19 Oct 2020 15:25:49 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=c.programming.doubts%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;c.programming.doubts@gmail.com&quot;&gt;c.programming.doubts@gmail.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;We still need additional information to diagnose the problem. If this is still an issue for you, would you please archive (tar or zip) the&#160;&lt;tt&gt;$dbpath/diagnostic.data&lt;/tt&gt;&#160;directory (the contents are described&#160;&lt;a href=&quot;https://docs.mongodb.com/manual/administration/analyzing-mongodb-performance/#full-time-diagnostic-data-capture&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;) and attach it to this ticket?&lt;/p&gt;

&lt;p&gt;Thanks,&lt;/p&gt;

&lt;p&gt;Edwin&lt;/p&gt;</comment>
                            <comment id="3437038" author="JIRAUSER1257066" created="Fri, 9 Oct 2020 15:04:19 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=c.programming.doubts%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;c.programming.doubts@gmail.com&quot;&gt;c.programming.doubts@gmail.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thanks for the information you provided so far. Would you please archive (tar or zip) the &lt;tt&gt;$dbpath/diagnostic.data&lt;/tt&gt; directory (the contents are described &lt;a href=&quot;https://docs.mongodb.com/manual/administration/analyzing-mongodb-performance/#full-time-diagnostic-data-capture&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;) and attach it to this ticket?&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                    </attachments>
                <subtasks>
                    </subtasks>
                <customfields>
                                                <customfield id="customfield_10050" key="com.atlassian.jira.toolkit:comments">
                        <customfieldname># Replies</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>4.0</customfieldvalue>
                        </customfieldvalues>
                    </customfield>
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                <customfield id="customfield_10055" key="com.atlassian.jira.ext.charting:firstresponsedate">
                        <customfieldname>Date of 1st Reply</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>Fri, 9 Oct 2020 15:04:19 +0000</customfieldvalue>

                        </customfieldvalues>
                    </customfield>
                                                                <customfield id="customfield_10052" key="com.atlassian.jira.toolkit:dayslastcommented">
                        <customfieldname>Days since reply</customfieldname>
                        <customfieldvalues>
                                        3 years, 16 weeks, 1 day ago
    
                        </customfieldvalues>
                    </customfield>
                                                                <customfield id="customfield_18254" key="com.onresolve.jira.groovy.groovyrunner:scripted-field">
                        <customfieldname>Dependencies</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue><![CDATA[]]></customfieldvalue>


                        </customfieldvalues>
                    </customfield>
                                                                <customfield id="customfield_15850" key="com.atlassian.jira.plugins.jira-development-integration-plugin:devsummary">
                        <customfieldname>Development</customfieldname>
                        <customfieldvalues>
                            
                        </customfieldvalues>
                    </customfield>
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            <customfield id="customfield_10057" key="com.atlassian.jira.toolkit:lastusercommented">
                        <customfieldname>Last comment by Customer</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>true</customfieldvalue>
                        </customfieldvalues>
                    </customfield>
                                                                                            <customfield id="customfield_10056" key="com.atlassian.jira.toolkit:lastupdaterorcommenter">
                        <customfieldname>Last commenter</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>edwin.zhou@mongodb.com</customfieldvalue>

                        </customfieldvalues>
                    </customfield>
                                                                <customfield id="customfield_11151" key="com.atlassian.jira.toolkit:LastCommentDate">
                        <customfieldname>Last public comment date</customfieldname>
                        <customfieldvalues>
                            3 years, 16 weeks, 1 day ago
                        </customfieldvalues>
                    </customfield>
                                                                                                                                                                                                                                                                    <customfield id="customfield_10051" key="com.atlassian.jira.toolkit:participants">
                        <customfieldname>Participants</customfieldname>
                        <customfieldvalues>
                                        <customfieldvalue>edwin.zhou@mongodb.com</customfieldvalue>
            <customfieldvalue>c.programming.doubts@gmail.com</customfieldvalue>
    
                        </customfieldvalues>
                    </customfield>
                                                                                                                                                                                                                                        <customfield id="customfield_14254" key="com.pyxis.greenhopper.jira:gh-lexo-rank">
                        <customfieldname>Product Rank</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>1|hybnnj:</customfieldvalue>

                        </customfieldvalues>
                    </customfield>
                                                                                                                                                                                <customfield id="customfield_12550" key="com.pyxis.greenhopper.jira:gh-lexo-rank">
                        <customfieldname>Rank</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>2|hxxztz:</customfieldvalue>

                        </customfieldvalues>
                    </customfield>
                                                                <customfield id="customfield_10558" key="com.pyxis.greenhopper.jira:gh-global-rank">
                        <customfieldname>Rank (Obsolete)</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>9223372036854775807</customfieldvalue>
                        </customfieldvalues>
                    </customfield>
                                                                                            <customfield id="customfield_23361" key="com.onresolve.jira.groovy.groovyrunner:scripted-field">
                        <customfieldname>Requested By</customfieldname>
                        <customfieldvalues>
                                

                        </customfieldvalues>
                    </customfield>
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                <customfield id="customfield_10053" key="com.atlassian.jira.ext.charting:timeinstatus">
                        <customfieldname>Time In Status</customfieldname>
                        <customfieldvalues>
                            
                        </customfieldvalues>
                    </customfield>
                                                                                                                                                                                                                                                                                                                                                                                                                                                                        <customfield id="customfield_22870" key="com.onresolve.jira.groovy.groovyrunner:scripted-field">
                        <customfieldname>Triagers</customfieldname>
                        <customfieldvalues>
                                    <customfieldvalue><![CDATA[edwin.zhou@mongodb.com]]></customfieldvalue>
    

                        </customfieldvalues>
                    </customfield>
                                                                                                                                                                                                                                                                                                                                                                                    <customfield id="customfield_14350" key="com.pyxis.greenhopper.jira:gh-lexo-rank">
                        <customfieldname>serverRank</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>1|hyb9wv:</customfieldvalue>

                        </customfieldvalues>
                    </customfield>
                                    </customfields>
    </item>
</channel>
</rss>