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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-49550] Modify mongos_get_shard_version.js to uphold causal consistency</title>
                <link>https://jira.mongodb.org/browse/SERVER-49550</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/4dcdc501520558d602897aed9aa61781265328d7/jstests/sharding/mongos_get_shard_version.js#L100&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;findOne()&lt;/a&gt; in mongos_get_shard_version.js should be replaced with st.configRS.awaitLastOpCommitted() so the shard version before the moveChunk reflects the shard version after the both splits are applied and committed to the config servers.&lt;/p&gt;

&lt;p&gt;Context:&lt;br/&gt;
 mongos_get_shard_version.js&#160;performs two splitChunks, moveChunk and checks the version of the mongos at the end to make sure that mongos has the version right before the moveChunk.&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;The splitChunk commands in the test are sent directly to the shards.&lt;/li&gt;
	&lt;li&gt;Mongos does a force refresh at the beginning of moveChunk&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47260&quot; title=&quot;mongos_get_shard_version.js assumes causal consistency but isn&amp;#39;t&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47260&quot;&gt;&lt;del&gt;SERVER-47260&lt;/del&gt;&lt;/a&gt; added a findOne command against the config server to make the mongos advance its the config opTime and use that opTime as the afterOpTime when refreshing from the config server.&lt;/li&gt;
	&lt;li&gt;However, the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/eae31861e0f813f0099e1d490c4a622d75cd5a08/src/mongo/s/sharding_egress_metadata_hook.cpp#L105&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;config opTime&lt;/a&gt; used as the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/eae31861e0f813f0099e1d490c4a622d75cd5a08/src/mongo/s/config_server_catalog_cache_loader.cpp#L122&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;afterOptime when refreshing from the config server&lt;/a&gt; can lag behind the lastAppliedOptime and cause the final shard version to be 2 instead of 3.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="1412212">SERVER-49550</key>
            <summary>Modify mongos_get_shard_version.js to uphold causal consistency</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="13201">Fixed</resolution>
                                        <assignee username="cathy.zhang@mongodb.com">Cathy Zhang</assignee>
                                    <reporter username="haley.connelly@mongodb.com">Haley Connelly</reporter>
                        <labels>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Thu, 16 Jul 2020 16:05:23 +0000</created>
                <updated>Sun, 29 Oct 2023 22:05:44 +0000</updated>
                            <resolved>Mon, 3 Aug 2020 17:04:03 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3316556" author="xgen-internal-githook" created="Fri, 31 Jul 2020 21:49:06 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Cathy Zhang&apos;, &apos;email&apos;: &apos;cathy2zhang@gmail.com&apos;, &apos;username&apos;: &apos;catzhang&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-49550&quot; title=&quot;Modify mongos_get_shard_version.js to uphold causal consistency&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-49550&quot;&gt;&lt;del&gt;SERVER-49550&lt;/del&gt;&lt;/a&gt; Modify mongos_get_shard_version.js to uphold causal consistency&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9bef7faf716c807b1250ed7d726f97180773cc2b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9bef7faf716c807b1250ed7d726f97180773cc2b&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1300876">SERVER-47260</issuekey>
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            <issuekey id="1471627">SERVER-50898</issuekey>
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