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    <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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            <title>[SERVER-9916] be smarter about config server retries in non-responsive situations</title>
                <link>https://jira.mongodb.org/browse/SERVER-9916</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In particular failure modes, retries to a failed config server can take several seconds and block queries to secondary and tertiary config servers.  When possible, we should be smarter about reading from other config servers when a server is unavailable.  This especially impacts authenticated clusters, since authentication data is not cached in mongos, so new authenticated connections are initially slow to respond.&lt;/p&gt;

&lt;p&gt;Example:&lt;br/&gt;
1.  First config server goes down and is unresponsive to the network, but does not reject packets.&lt;br/&gt;
2.  A new authenticated connection is created to mongos.&lt;br/&gt;
3.  Mongos tries to read from the first config server, and before the read tries to reconnect.  This eventually fails, but not until the several second timeout.&lt;br/&gt;
4.  Mongos successfully reads from the second config server, but the response time is bad.&lt;br/&gt;
5.  This continues to happen for future new connections, each new connection waits for the full timeout, despite the fact that the server is still unavailable.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="78814">SERVER-9916</key>
            <summary>be smarter about config server retries in non-responsive situations</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="greg_10gen">Greg Studer</reporter>
                        <labels>
                    </labels>
                <created>Wed, 12 Jun 2013 19:25:33 +0000</created>
                <updated>Wed, 10 Dec 2014 23:04:48 +0000</updated>
                            <resolved>Fri, 7 Mar 2014 19:03:45 +0000</resolved>
                                    <version>2.5.0</version>
                                                    <component>Sharding</component>
                                        <votes>3</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="373503" author="greg_10gen" created="Wed, 3 Jul 2013 16:43:05 +0000"  >&lt;p&gt;Not necessarily, if the database primary information has to be read from the config server authing to another database may initially be slow (though that information is cached).  Also not specific to just authentication, but any operation using the config server.&lt;/p&gt;</comment>
                            <comment id="359718" author="justin@idle-games.com" created="Thu, 13 Jun 2013 19:33:31 +0000"  >&lt;p&gt;This is specific to authenticating to the admin db, correct? Authentication against other databases should work regardless of config server state?&lt;/p&gt;</comment>
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