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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-24458] Assert that ConfigServerMetadata is always included in responses from shards</title>
                <link>https://jira.mongodb.org/browse/SERVER-24458</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="292259">SERVER-24458</key>
            <summary>Assert that ConfigServerMetadata is always included in responses from shards</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="9">Done</resolution>
                                        <assignee username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                            <label>PM-315</label>
                    </labels>
                <created>Tue, 7 Jun 2016 22:24:20 +0000</created>
                <updated>Thu, 10 Feb 2022 08:08:49 +0000</updated>
                            <resolved>Thu, 10 Feb 2022 08:08:48 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4347118" author="kaloian.manassiev" created="Thu, 10 Feb 2022 08:08:38 +0000"  >&lt;p&gt;The batch up/downconvert logic no longer exists since we use commands for all intra-cluster communication so I am closing this ticket as Gone Away.&lt;/p&gt;</comment>
                            <comment id="1474407" author="dianna.hohensee" created="Wed, 11 Jan 2017 13:36:32 +0000"  >&lt;p&gt;After an offline discussion, it appears that the command upconvert and downconvert isn&apos;t always handling the ConfigServerMetadata, but rather leaving it out at conversion points and thus losing it.&lt;/p&gt;

&lt;p&gt;Putting this ticket in PM-315, because this fix should fall out of that project&apos;s completion, and then we can assert that ConfigServerMetadata is always included when it actually is.&lt;/p&gt;</comment>
                            <comment id="1379850" author="spencer" created="Thu, 8 Sep 2016 18:37:30 +0000"  >&lt;p&gt;Okay, I finally understand why adding this assertion was causing things to fail.&lt;/p&gt;

&lt;p&gt;Certain commands, like count for example, still use DBClient to run commands on the shards, which uses the legacy OP_QUERY form of running commands.  On the shards, when we are using OP_QUERY, commands use a LegacyReplyBuilder to generate the command response.  &lt;a href=&quot;https://github.com/mongodb/mongo/blob/1083942cef731e876b8c7ee029057a9fcd252336/src/mongo/rpc/legacy_reply_builder.cpp#L93&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;LegacyReplyBuilder::setMetadata&lt;/a&gt; only looks for ShardingMetadata and throws out all other metadata written to the metadata response (including ConfigServerMetadata, where the config server optime is given).  We either need to add handling of ConfigServerMetadata to LegacyReplyBuilder::setMetadata, or switch to using OP_COMMAND for &lt;b&gt;all&lt;/b&gt; intra-cluster communication.&lt;/p&gt;</comment>
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            <issuekey id="300130">SERVER-24993</issuekey>
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