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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-12010] Mongos process not starting if more than 3 config servers in the process arguments </title>
                <link>https://jira.mongodb.org/browse/SERVER-12010</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hi,&lt;/p&gt;

&lt;p&gt;For more redundancy i had created 5 config server process in 5 different machines, and added the 5 config server information in mongos process.&lt;br/&gt;
When i try to start mongos process, mongos process is failed to start with the below error&lt;/p&gt;

&lt;p&gt;Mongos server process:&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;mongos --configdb host01:47720,host2:47720,host3:47720,host4:47720,host5:47720 --pidfilepath /var/run/mongos-57720.pid --port 57720 --fork --logpath /var/log/mongos-57720.log --logappend --quiet&lt;br/&gt;
Mon Dec  9 07:15:55.921 need either 1 or 3 configdbs&lt;br/&gt;
#&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;I did not find any error or any other logs updated in the mongos logs, straight away it&apos;s though &quot;need either 1 or 3 configdbs&quot; message on screen and exit.&lt;/p&gt;

&lt;p&gt;Config servers active and running &lt;br/&gt;
On host 1&lt;br/&gt;
root     30859     1  0 07:12 ?        00:00:00 /usr/bin/mongod --configsvr --port 47720 --smallfiles --dbpath=/data/configSrv-47720 --fork --logpath /var/log/configServer-47720.log --logappend --quiet&lt;/p&gt;

&lt;p&gt;On host2&lt;br/&gt;
root      8371     1  0 07:08 ?        00:00:00 /usr/bin/mongod --configsvr --port 47720 --smallfiles --dbpath=/data/configSrv-47720 --fork --logpath /var/log/configServer-47720.log --logappend --quiet&lt;/p&gt;

&lt;p&gt;On host3&lt;br/&gt;
root      9428     1  0 07:12 ?        00:00:00 /usr/bin/mongod --configsvr --port 47720 --smallfiles --dbpath=/data/configSrv-47720 --fork --logpath /var/log/configServer-47720.log --logappend --quiet&lt;/p&gt;

&lt;p&gt;On host4&lt;br/&gt;
root     14085     1  0 07:12 ?        00:00:00 /usr/bin/mongod --configsvr --port 47720 --smallfiles --dbpath=/data/configSrv-47720 --fork --logpath /var/log/configServer-47720.log --logappend --quiet&lt;/p&gt;

&lt;p&gt;on host5&lt;br/&gt;
root     18046     1  0 07:12 ?        00:00:00 /usr/bin/mongod --configsvr --port 47720 --smallfiles --dbpath=/data/configSrv-47720 --fork --logpath /var/log/configServer-47720.log --logappend --quiet&lt;/p&gt;

&lt;p&gt;I am not sure why mongos process is not starting, mongos process will it allow maximum three config servers only?&lt;/p&gt;

&lt;p&gt;Could you please let me know why its not allowing to add more than 3 configdbs?&lt;/p&gt;

&lt;p&gt;Thanks &amp;amp; Regards&lt;br/&gt;
Krishnachaitanya &lt;/p&gt;</description>
                <environment>Linux CentOs 5.7/5.8</environment>
        <key id="101638">SERVER-12010</key>
            <summary>Mongos process not starting if more than 3 config servers in the process arguments </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="9">Done</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="kthummur">Krishnachaitanya Thummuru</reporter>
                        <labels>
                            <label>sharding</label>
                    </labels>
                <created>Mon, 9 Dec 2013 14:31:22 +0000</created>
                <updated>Wed, 10 Dec 2014 23:11:19 +0000</updated>
                            <resolved>Thu, 12 Dec 2013 05:27:07 +0000</resolved>
                                    <version>2.4.6</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="469816" author="asya" created="Thu, 12 Dec 2013 07:05:53 +0000"  >&lt;p&gt;Hi,&lt;/p&gt;

&lt;p&gt;You can read about how to deploy a sharded cluster in our docs:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;http://docs.mongodb.org/manual/tutorial/deploy-shard-cluster/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/tutorial/deploy-shard-cluster/&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Asya&lt;/p&gt;</comment>
                            <comment id="469799" author="kthummur" created="Thu, 12 Dec 2013 05:59:28 +0000"  >&lt;p&gt;Hi Eliot&lt;/p&gt;

&lt;p&gt;Thanks for your update!&lt;br/&gt;
Could you please let me know where can i get the information about the supporting of the config servers by a mongo cluster, It would be helpful if you share any document or link.&lt;/p&gt;

&lt;p&gt;Thanks &amp;amp; Regards&lt;br/&gt;
Krishnachaitanya &lt;/p&gt;</comment>
                            <comment id="469789" author="eliot" created="Thu, 12 Dec 2013 05:27:07 +0000"  >&lt;p&gt;A mongo cluster needs exactly three config servers.&lt;br/&gt;
5 is not supported.&lt;/p&gt;</comment>
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