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    <title>MongoDB Jira</title>
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    <description>This file is an XML representation of an issue</description>
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        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-36159] Log whenever the gossiped config server opTime term changes</title>
                <link>https://jira.mongodb.org/browse/SERVER-36159</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In mongodb 3.4 and earlier, the sharded cluster nodes gossip the config server&apos;s opTime in order to ensure they always read the latest routing metadata. This opTime contains both timestamp and a term and since it is only used internally between the cluster nodes is not signed or verified in any way.&lt;/p&gt;

&lt;p&gt;As part of a customer support case we observed the gossiped config server opTime term jump forward without it actually having changed on the config server itself. Such as jump could potentially happen due to DNS misconfiguration causing members of a sharded cluster to inadvertently talk to the wrong host and since there is no validation in 3.4 the term jumping forward could have disastrous consequences for the entire cluster.&lt;/p&gt;

&lt;p&gt;In order to help diagnose such issues we should have shard nodes log whenever the config server&apos;s opTime term changes. Such logging should also ideally include the node from which the new term came so that it can be traced back to the first node which caused it.&lt;/p&gt;</description>
                <environment></environment>
        <key id="572309">SERVER-36159</key>
            <summary>Log whenever the gossiped config server opTime term changes</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="13201">Fixed</resolution>
                                        <assignee username="kevin.pulo@mongodb.com">Kevin Pulo</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                    </labels>
                <created>Tue, 17 Jul 2018 12:42:08 +0000</created>
                <updated>Sun, 29 Oct 2023 22:29:46 +0000</updated>
                            <resolved>Thu, 11 Jul 2019 05:53:12 +0000</resolved>
                                                    <fixVersion>3.6.15</fixVersion>
                    <fixVersion>4.2.0-rc0</fixVersion>
                    <fixVersion>4.0.13</fixVersion>
                                    <component>Sharding</component>
                                        <votes>3</votes>
                                    <watches>16</watches>
                                                                                                                <comments>
                            <comment id="2419082" author="xgen-internal-githook" created="Fri, 13 Sep 2019 08:41:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kevin Pulo&apos;, &apos;username&apos;: &apos;devkev&apos;, &apos;email&apos;: &apos;kevin.pulo@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36159&quot; title=&quot;Log whenever the gossiped config server opTime term changes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36159&quot;&gt;&lt;del&gt;SERVER-36159&lt;/del&gt;&lt;/a&gt; Log whenever the gossiped config server opTime term changes&lt;/p&gt;

&lt;p&gt;(cherry picked from commit f6bee9fab63e45bd7ef30e73aff6a21edca16aa2)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/392af48b71dfb690a6cc1d119fdc40b61925098b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/392af48b71dfb690a6cc1d119fdc40b61925098b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2385692" author="xgen-internal-githook" created="Mon, 26 Aug 2019 05:42:46 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;devkev&apos;, &apos;email&apos;: &apos;kevin.pulo@mongodb.com&apos;, &apos;name&apos;: &apos;Kevin Pulo&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36159&quot; title=&quot;Log whenever the gossiped config server opTime term changes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36159&quot;&gt;&lt;del&gt;SERVER-36159&lt;/del&gt;&lt;/a&gt; Log whenever the gossiped config server opTime term changes&lt;/p&gt;

&lt;p&gt;(cherry picked from commit c2c6ed338f617e89600f4a221abc19045431c46e)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f6bee9fab63e45bd7ef30e73aff6a21edca16aa2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f6bee9fab63e45bd7ef30e73aff6a21edca16aa2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2320539" author="kevin.pulo@10gen.com" created="Thu, 11 Jul 2019 05:54:36 +0000"  >&lt;p&gt;Remaining work will be continued in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42155&quot; title=&quot;Indicate term mismatches when readConcern times out&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42155&quot;&gt;&lt;del&gt;SERVER-42155&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="2264700" author="xgen-internal-githook" created="Thu, 30 May 2019 03:13:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kevin Pulo&apos;, &apos;email&apos;: &apos;kevin.pulo@mongodb.com&apos;, &apos;username&apos;: &apos;devkev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36159&quot; title=&quot;Log whenever the gossiped config server opTime term changes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36159&quot;&gt;&lt;del&gt;SERVER-36159&lt;/del&gt;&lt;/a&gt; Log whenever the gossiped config server opTime term changes&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c2c6ed338f617e89600f4a221abc19045431c46e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c2c6ed338f617e89600f4a221abc19045431c46e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2154676" author="eric.sommer" created="Mon, 18 Feb 2019 12:23:13 +0000"  >&lt;p&gt;Additionally, we should extend the error message returned as part of the WriteConcernError (or the ExceededTimeLimit error) to include text like: &quot;Current term is 1 but request is asking for 6&quot; or something similar.  This would help alert users that a mismatches/unsatisfiable term is causing the error.&lt;/p&gt;</comment>
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