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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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<item>
            <title>[SERVER-4822] How long does it usually take for mongos to figure out new primary of replicasets?</title>
                <link>https://jira.mongodb.org/browse/SERVER-4822</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Stepping down a primary with rs.stepDown() makes mongos unusable for a while, causing 500&apos;s on the website while it figures out changes. Instead of waiting I restarted mongos and it was working again.&lt;/p&gt;

&lt;p&gt;How long is the normal re-configuration while new primaries are discovered etc?&lt;br/&gt;
And is there a good way to prevent the 500&apos;s on the PHP clients from even occurring while you do this.&lt;/p&gt;</description>
                <environment>Debian Linux, PHP driver 1.2.6</environment>
        <key id="29491">SERVER-4822</key>
            <summary>How long does it usually take for mongos to figure out new primary of replicasets?</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="-1">Unassigned</assignee>
                                    <reporter username="balboah">Johnny Boy</reporter>
                        <labels>
                            <label>mongos</label>
                    </labels>
                <created>Tue, 31 Jan 2012 10:05:29 +0000</created>
                <updated>Wed, 29 Feb 2012 03:53:39 +0000</updated>
                            <resolved>Wed, 1 Feb 2012 04:34:06 +0000</resolved>
                                    <version>2.0.2</version>
                                                    <component>Replication</component>
                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="85595" author="eliot" created="Mon, 6 Feb 2012 13:26:10 +0000"  >&lt;p&gt;Sounds like there is something else going on.&lt;br/&gt;
Can you send the mongos log?&lt;/p&gt;</comment>
                            <comment id="85563" author="balboah" created="Mon, 6 Feb 2012 11:10:48 +0000"  >&lt;p&gt;It seems to keep failing with db assertion failure, assertion: &apos;DBClientBase::findN:transport  error until I restart mongos as soon as I do changes to replica sets. Which is a bit annoying when you have a few mongos running.&lt;/p&gt;

&lt;p&gt;Even when the primary is the same machine afterwards, it doesn&apos;t seem like it reconnects to it without me interacting. Same goes for both PHP and Python driver when using mongos.&lt;/p&gt;

&lt;p&gt;Did I miss something?&lt;/p&gt;</comment>
                            <comment id="83915" author="eliot" created="Wed, 1 Feb 2012 04:33:59 +0000"  >&lt;p&gt;reconfiguration usually takes a couple of seconds at most.&lt;/p&gt;

&lt;p&gt;On the php side you should handle the mongo errors and handle appropriately for your app&lt;/p&gt;</comment>
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