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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-5217] Replica set fail-over on high volume latency</title>
                <link>https://jira.mongodb.org/browse/SERVER-5217</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;MongoDB&apos;s heartbeat function does not monitor the health of the disk writes / reads. So in case the underlying disks on the primary node are having problems MongoDB will not switch primary.&lt;/p&gt;

&lt;p&gt;I would like a feature in the heartbeat function that includes health checking the read/write performance. It would probably be good if this more extensive heartbeat function is optional. See the discussion on mongodb-user maillist &lt;a href=&quot;https://groups.google.com/forum/?fromgroups#!starred/mongodb-user/gY7r3f-yz0k&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://groups.google.com/forum/?fromgroups#!starred/mongodb-user/gY7r3f-yz0k&lt;/a&gt;. &lt;/p&gt;

&lt;p&gt;Right now the only option for us when a node has disk problems is to stop the mongod process in order to force a change of primary node.&lt;/p&gt;</description>
                <environment>Debian GNU/Linux 6</environment>
        <key id="32312">SERVER-5217</key>
            <summary>Replica set fail-over on high volume latency</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="sebastian.dahlgren@gmail.com">Sebastian Dahlgren</reporter>
                        <labels>
                            <label>replication</label>
                    </labels>
                <created>Tue, 6 Mar 2012 11:55:57 +0000</created>
                <updated>Tue, 6 Dec 2022 05:35:17 +0000</updated>
                                            <version>2.0.1</version>
                    <version>2.0.2</version>
                                                    <component>Replication</component>
                                        <votes>1</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="95783" author="eliot" created="Tue, 6 Mar 2012 14:57:03 +0000"  >&lt;p&gt;Sorry - I didn&apos;t mean this would increase the load, I mean a short term user load spike could flip the set unnecessarily.  Or an overall increase could just cause the set to flip back and forth constantly.  &lt;/p&gt;</comment>
                            <comment id="95739" author="sebastian.dahlgren@gmail.com" created="Tue, 6 Mar 2012 13:15:55 +0000"  >&lt;p&gt;Thanks for the quick feedback Elliot.&lt;/p&gt;

&lt;p&gt;Two thoughts:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;This would indeed increase the load, however it could be optional (with default to off)&lt;/li&gt;
	&lt;li&gt;The thought about a hook for this is a cool approach, might be the way to go&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="95735" author="eliot" created="Tue, 6 Mar 2012 13:02:35 +0000"  >&lt;p&gt;Interesting, but tricky.&lt;br/&gt;
Concerns:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;increased load causes disk to get busy.  failing over doesn&apos;t help, just moves load&lt;/li&gt;
	&lt;li&gt;jitter&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;This is really something ec2/ebs specific thing...&lt;/p&gt;

&lt;p&gt;What might make more sense is a hook such that you can specify a binary to execute that determines &quot;health&quot;.&lt;/p&gt;</comment>
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            <issuekey id="486476">SERVER-32867</issuekey>
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