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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-20459] pingMs and lastHearbeatMessage fields are sporadic</title>
                <link>https://jira.mongodb.org/browse/SERVER-20459</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The pingMs and lastHearbeatMessage fields in the members array of the replSetGetStatus command occur sporadically. The fields appear to be alternately present for a couple of seconds and missing for a couple of seconds.&lt;/p&gt;

&lt;p&gt;This creates frequent schema changes that reduce the compression efficiency of FTDC storage by a factor of 5-10x.&lt;/p&gt;

&lt;p&gt;Observed behavior in 3.0 is that pingMs is always present (and lastHearbeatMessage seems to be new for 3.1).&lt;/p&gt;</description>
                <environment></environment>
        <key id="230264">SERVER-20459</key>
            <summary>pingMs and lastHearbeatMessage fields are sporadic</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="9">Done</resolution>
                                        <assignee username="milkie@mongodb.com">Eric Milkie</assignee>
                                    <reporter username="bruce.lucas@mongodb.com">Bruce Lucas</reporter>
                        <labels>
                            <label>FTDC</label>
                    </labels>
                <created>Thu, 17 Sep 2015 16:48:28 +0000</created>
                <updated>Wed, 7 Oct 2015 21:35:42 +0000</updated>
                            <resolved>Mon, 21 Sep 2015 17:54:21 +0000</resolved>
                                                    <fixVersion>3.1.9</fixVersion>
                                    <component>Diagnostics</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1038597" author="xgen-internal-githook" created="Mon, 21 Sep 2015 17:51:00 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;milkie&apos;, u&apos;name&apos;: u&apos;Eric Milkie&apos;, u&apos;email&apos;: u&apos;milkie@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20459&quot; title=&quot;pingMs and lastHearbeatMessage fields are sporadic&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20459&quot;&gt;&lt;del&gt;SERVER-20459&lt;/del&gt;&lt;/a&gt; repl pings start as -1 ms to avoid collisions with 0 ms&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1282823cdb82747323435d05b0bd79b33c032177&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1282823cdb82747323435d05b0bd79b33c032177&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1033317" author="bruce.lucas@10gen.com" created="Thu, 17 Sep 2015 17:43:42 +0000"  >&lt;p&gt;It would have been significant effort to set up a cluster with a ping time consistently &amp;gt;1ms, so instead I tried the proposed patch and it (or equivalent) would fix the problem, thanks.&lt;/p&gt;</comment>
                            <comment id="1033279" author="milkie" created="Thu, 17 Sep 2015 17:17:39 +0000"  >&lt;p&gt;I believe the new behavior is that if the recent ping time happens to be less than 1ms, it rounds to 0 and then doesn&apos;t display the pingMs field. The old behavior in 3.0 was to display the field even if the ping time was 0.&lt;br/&gt;
Does the problem still occur if you are running replica set members on separate devices?&lt;br/&gt;
The lastHeartbeatMessage can only appear if the pingMs field appears.&lt;/p&gt;</comment>
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