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    <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>
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<item>
            <title>[SERVER-29652] mongos should not gossip $logicalTime until admin.system.keys are created</title>
                <link>https://jira.mongodb.org/browse/SERVER-29652</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In shards and config servers the featureCompatibilityVersion is available. This is however not the case for mongos which is currently uses the featureCompatibilityVersion correlated to its binary.&lt;/p&gt;

&lt;p&gt;This causes a problem in causal consistency as mongos will be trying to sign the outgoing requests and will block waiting on the keys. This is not acceptable as the upgrade process may take very long time. Its possible that user upgrade the binaries but never issue setFeatureCompatibilityVersion command. So polling is not a good idea for mongos to discover its version. &lt;br/&gt;
To address that mongos will:&lt;br/&gt;
At startup check for keys. If no keys are found then mongos will eventually be checking for keys every 10 minutes (its already default behavior)&lt;br/&gt;
Check for keys immediately if the incoming messages contains proof to validate (its already default behavior)&lt;br/&gt;
If keys were never found do not add $logicalTime and operationTime to the command Response (its new)&lt;/p&gt;

&lt;p&gt;This way mongos will eventually start using causal consistency within 10 minutes of actual upgrade.&lt;/p&gt;</description>
                <environment></environment>
        <key id="394390">SERVER-29652</key>
            <summary>mongos should not gossip $logicalTime until admin.system.keys are created</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="jack.mulrow@mongodb.com">Jack Mulrow</assignee>
                                    <reporter username="misha.tyulenev@mongodb.com">Misha Tyulenev</reporter>
                        <labels>
                    </labels>
                <created>Thu, 15 Jun 2017 16:25:26 +0000</created>
                <updated>Mon, 30 Oct 2023 23:16:02 +0000</updated>
                            <resolved>Thu, 22 Jun 2017 14:16:38 +0000</resolved>
                                                    <fixVersion>3.5.10</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1605287" author="xgen-internal-githook" created="Fri, 23 Jun 2017 15:45:14 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;jsmulrow&apos;, u&apos;name&apos;: u&apos;Jack Mulrow&apos;, u&apos;email&apos;: u&apos;jack.mulrow@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29652&quot; title=&quot;mongos should not gossip $logicalTime until admin.system.keys are created&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29652&quot;&gt;&lt;del&gt;SERVER-29652&lt;/del&gt;&lt;/a&gt; don&apos;t enable key generation in LogicalTimeValidatorTest::setUp()&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/763891dbeee9c3a3080410e916a4f1f081751d5f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/763891dbeee9c3a3080410e916a4f1f081751d5f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1604434" author="xgen-internal-githook" created="Thu, 22 Jun 2017 17:28:34 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;jsmulrow&apos;, u&apos;name&apos;: u&apos;Jack Mulrow&apos;, u&apos;email&apos;: u&apos;jack.mulrow@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29652&quot; title=&quot;mongos should not gossip $logicalTime until admin.system.keys are created&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29652&quot;&gt;&lt;del&gt;SERVER-29652&lt;/del&gt;&lt;/a&gt; don&apos;t enable key generator too early in logical_time_validator_test&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4a5b1dcf17f3235f3d60b481387f2bd46017d81f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4a5b1dcf17f3235f3d60b481387f2bd46017d81f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1604246" author="xgen-internal-githook" created="Thu, 22 Jun 2017 14:15:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;jsmulrow&apos;, u&apos;name&apos;: u&apos;Jack Mulrow&apos;, u&apos;email&apos;: u&apos;jack.mulrow@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29652&quot; title=&quot;mongos should not gossip $logicalTime until admin.system.keys are created&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29652&quot;&gt;&lt;del&gt;SERVER-29652&lt;/del&gt;&lt;/a&gt; mongos should not gossip logical time until admin.system.keys is created&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0d79ab8b66fcaf06bf5622de580ed5a85c95bc16&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0d79ab8b66fcaf06bf5622de580ed5a85c95bc16&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="396153">SERVER-29754</issuekey>
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