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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-4896] Mongo flush critical alert </title>
                <link>https://jira.mongodb.org/browse/SERVER-4896</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We have three node production replica set. We received critical flush alert when we were adding images to product catalog, what increased from ~150k MB to ~330KMB the product catalog  collection.&lt;br/&gt;
The primary flush took 5ms at about that time where the secondary and tertiary took +500ms.&lt;br/&gt;
Currently, we have Mongo flush critical alert set to 400ms.&lt;/p&gt;

&lt;p&gt;We would like to know why it takes much more time between Primary/master and slaves.&lt;br/&gt;
Should we increase current threshold for that alert?&lt;/p&gt;

&lt;p&gt;Any information and help is appreciated.&lt;br/&gt;
Thank you,&lt;br/&gt;
Aggie Filarska&lt;/p&gt;</description>
                <environment>Red Hat Enterprise Linux Server release 5.7 (Tikanga). Three node replica set.</environment>
        <key id="30095">SERVER-4896</key>
            <summary>Mongo flush critical alert </summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="scotthernandez">Scott Hernandez</assignee>
                                    <reporter username="afilarska">Aggie Filarska</reporter>
                        <labels>
                            <label>performance</label>
                    </labels>
                <created>Tue, 7 Feb 2012 16:11:33 +0000</created>
                <updated>Wed, 14 May 2014 19:04:04 +0000</updated>
                            <resolved>Mon, 9 Jul 2012 21:17:51 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="86304" author="eliot" created="Tue, 7 Feb 2012 22:35:28 +0000"  >&lt;p&gt;That can be totally normal based on read/write patterns and generally not an issue unless overall io on a box is nearing limits.&lt;/p&gt;</comment>
                            <comment id="86135" author="afilarska" created="Tue, 7 Feb 2012 17:10:25 +0000"  >&lt;p&gt;Hi Scott,&lt;br/&gt;
By default Mongo &#8216;flushes to disk&#8217; every 60 seconds.&lt;br/&gt;
Usually it takes about 5ms to flush and we noticed that when we added more data to our collection, the primary flush still took 5ms but secondary and tertiary flush took over 500ms.&lt;br/&gt;
We would like to know what is the possible impact on the performance when this happens and how to prevent it.&lt;/p&gt;

&lt;p&gt;Thank you,&lt;br/&gt;
Aggie&lt;/p&gt;</comment>
                            <comment id="86118" author="scotthernandez" created="Tue, 7 Feb 2012 16:39:38 +0000"  >&lt;p&gt;I&apos;m not sure what you mean byt &quot;flush alert&quot;. Can you describe that?&lt;/p&gt;

&lt;p&gt;It sounds like this is unrelated to java. I&apos;m going to move this to the SERVER project now.&lt;/p&gt;</comment>
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