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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
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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-17668] Mongos Fail over did not work as expected</title>
                <link>https://jira.mongodb.org/browse/SERVER-17668</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We ran a mongo config server failover test several weeks ago. What we did is to ramp up some load in the system and then we started to stop services on mongo config server in the sequence of master, slave1 and slave2. &lt;/p&gt;

&lt;p&gt;Based on the following comments from mongo knowledge-base, the system should still function without performance degradation.&lt;br/&gt;
If all three config servers are unavailable, you can still use the cluster if you do not restart the mongos instances until after the config servers are accessible again. If you restart the mongos instances before the config servers are available, the mongos will be unable to route reads and writes.&lt;/p&gt;


&lt;p&gt;However, the following findings from our load test is not what we expect according to mongo knowledge-base. &lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;When one of the mongo-config server service was stopped the overall throughput  drop from 1008.52 to 995.9&lt;/li&gt;
	&lt;li&gt;When two of the mongo-config server services were stopped the overall throughput drop from 995.9 to 652.&lt;/li&gt;
	&lt;li&gt;When all three mongo-config server services were shut down, all requests are failed.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Is this a known bug?&lt;/p&gt;</description>
                <environment></environment>
        <key id="190755">SERVER-17668</key>
            <summary>Mongos Fail over did not work as expected</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="3">Duplicate</resolution>
                                        <assignee username="schwerin@mongodb.com">Andy Schwerin</assignee>
                                    <reporter username="jfang@turbine.com">joe fang</reporter>
                        <labels>
                    </labels>
                <created>Thu, 19 Mar 2015 21:17:09 +0000</created>
                <updated>Thu, 19 Mar 2015 22:31:51 +0000</updated>
                            <resolved>Thu, 19 Mar 2015 22:31:50 +0000</resolved>
                                    <version>2.6.8</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="858429" author="schwerin" created="Thu, 19 Mar 2015 22:31:51 +0000"  >&lt;p&gt;Duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-17617&quot; title=&quot;One config server being down can block read operations on config data for seconds&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-17617&quot;&gt;&lt;del&gt;SERVER-17617&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="858405" author="schwerin" created="Thu, 19 Mar 2015 22:00:15 +0000"  >&lt;p&gt;It is as-designed that routing of requests eventually fails when all config servers are unavailable.  Furthermore, when any config server is unavailable, it is expected that metadata changes (such as chunk migrations, sharding collections and creating databases) will fail.&lt;/p&gt;

&lt;p&gt;The slow-down you experience when one config server is stopped will vary based on which of the config servers you stop, similar for the second one.  This is a known issue in the config server protocols.  Our long term plan is to implement &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1448&quot; title=&quot;Host sharding config data on a replica set&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1448&quot;&gt;&lt;del&gt;SERVER-1448&lt;/del&gt;&lt;/a&gt; and replace config servers with replica sets, and to improve the replica set secondary-read behavior.  In the interim, we attempt to mitigate specific performance problems, but the config server protocols offer limited recourse.&lt;/p&gt;</comment>
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