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        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-20122] Throw out connections created while adding a new shard</title>
                <link>https://jira.mongodb.org/browse/SERVER-20122</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When adding a new shard, we &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/s/catalog/catalog_manager_common.cpp#L99&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;create a connection&lt;/a&gt; to the new shard to validate some basic properties about it before adding it as a shard.  This will put a connection to that shard into the connection pool used by the NetworkInterface.  If we successfully add that shard, then try to query it, we run the risk of using the already existing connection, which will not have run the part of the ShardingNetworkConnectionHook that sends the shard initialization information.  If before we finish the addShard command we throw out all connections to that shard then we know that the next time we try to talk to that shard we will have to create a new connection, guaranteeing that the shard initialization logic gets run&lt;/p&gt;</description>
                <environment></environment>
        <key id="227062">SERVER-20122</key>
            <summary>Throw out connections created while adding a new shard</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="spencer@mongodb.com">Spencer Brody</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                    </labels>
                <created>Tue, 25 Aug 2015 21:28:55 +0000</created>
                <updated>Wed, 2 Sep 2015 16:11:13 +0000</updated>
                            <resolved>Wed, 2 Sep 2015 16:11:03 +0000</resolved>
                                                                    <component>Networking</component>
                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1020741" author="spencer" created="Wed, 2 Sep 2015 16:11:03 +0000"  >&lt;p&gt;We avoid this issue by using a different TaskExecutor (and thus different NetworkInterface) for sending commands to servers being added in addShard.&lt;/p&gt;</comment>
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