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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-27368] Balancer not working on 3.4</title>
                <link>https://jira.mongodb.org/browse/SERVER-27368</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hello, I recently tried to deploy MongoDB 3.4 to my sharded cluster running 3.2.10. After a lot of trouble including having to re deploy the setup I was able to get all components on, but then discovered that the balancer wasn&apos;t working and I was getting multiple errors of the config server timing out and read/write concerns throwing warnings and even the other components saying it was down when it wasn&apos;t. Either way I still couldn&apos;t get it to balance even adding another shard would not start moving chunks over so I reverted back to 3.2.10 and it works normal. I have attached log files for each component during the time when 3.4 was deployed(look around 12:30 time stamps onward on the log files to see the relevant info when the 3.4 instances were started up) and can provide other things such as config files diagnostic data etc if needed to help but I believe it is a bug because when reverted back to 3.2.10 it was balancing and working as expected.&lt;/p&gt;</description>
                <environment></environment>
        <key id="337896">SERVER-27368</key>
            <summary>Balancer not working on 3.4</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="btomblinson">Brandon Tomblinson</reporter>
                        <labels>
                    </labels>
                <created>Sat, 10 Dec 2016 22:55:40 +0000</created>
                <updated>Wed, 14 Dec 2016 19:38:20 +0000</updated>
                            <resolved>Wed, 14 Dec 2016 19:38:20 +0000</resolved>
                                    <version>3.4.0</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="1456971" author="btomblinson" created="Tue, 13 Dec 2016 22:12:52 +0000"  >&lt;p&gt;Spencer,&lt;br/&gt;
Thank you for your help! I enabled journaling for the config server and re-deployed 3.4 and it works as expected! You can mark this ticket as closed. Thanks again.&lt;/p&gt;

&lt;p&gt;-Brandon&lt;/p&gt;</comment>
                            <comment id="1455602" author="spencer" created="Mon, 12 Dec 2016 20:14:12 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=btomblinson&quot; class=&quot;user-hover&quot; rel=&quot;btomblinson&quot;&gt;btomblinson&lt;/a&gt;,&lt;br/&gt;
This is due to a combination of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-24551&quot; title=&quot;Version 3.2 incorrect &amp;#39;nojournal is not allowed when configsvr is specified&amp;#39; error when specifying nojournal=false&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-24551&quot;&gt;&lt;del&gt;SERVER-24551&lt;/del&gt;&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23956&quot; title=&quot;Inconsistent behavior between 3.2.6-rc0 and 3.3.5 for writeconcern majority and journaling&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23956&quot;&gt;&lt;del&gt;SERVER-23956&lt;/del&gt;&lt;/a&gt;.  The short version is that you need to enable journaling on the config server.&lt;/p&gt;

&lt;p&gt;For a little more background, the issue is basically that in 3.2 we were incorrectly marking writes as durable in certain cases on ephemeral storage engines or when journaling is disabled.  In 3.4 we fixed that behavior, but that means that now the committed snapshot used for readConcern:majority reads never progresses if journaling is off, unless you also set the &lt;a href=&quot;https://docs.mongodb.com/manual/reference/replica-configuration/#rsconf.writeConcernMajorityJournalDefault&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;writeConcernMajorityJournalDefault&lt;/a&gt; value in the replica set config to false.&lt;/p&gt;

&lt;p&gt;In the case of config servers, however, it should be forbidden to ever turn off journaling.  It&apos;s only due to a bug in our option parsing that allowed this to happen.  If you turn journaling on for your config server, everything should start working.&lt;/p&gt;

&lt;p&gt;Sorry for the confusion.&lt;br/&gt;
-Spencer&lt;/p&gt;</comment>
                            <comment id="1454829" author="btomblinson" created="Sun, 11 Dec 2016 17:25:27 +0000"  >&lt;p&gt;Ramon,&lt;br/&gt;
I thought that too, so I tried creating and adding another config server and it did the exact same thing on both.&lt;/p&gt;</comment>
                            <comment id="1454799" author="ramon.fernandez" created="Sun, 11 Dec 2016 14:19:02 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=btomblinson&quot; class=&quot;user-hover&quot; rel=&quot;btomblinson&quot;&gt;btomblinson&lt;/a&gt;, I believe the behavior you&apos;re observing is related to having a one-node config server. We&apos;re investigating further and we&apos;ll post updates on this ticket.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="293714">SERVER-24551</issuekey>
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                <attachments>
                            <attachment id="145793" name="mongodConfig.log" size="60067850" author="btomblinson" created="Sat, 10 Dec 2016 22:55:38 +0000"/>
                            <attachment id="145796" name="mongodRouter.log" size="11239897" author="btomblinson" created="Sat, 10 Dec 2016 22:44:07 +0000"/>
                            <attachment id="145795" name="mongodShard1.log" size="18659813" author="btomblinson" created="Sat, 10 Dec 2016 22:45:27 +0000"/>
                            <attachment id="145794" name="mongodShard2.log" size="2761366" author="btomblinson" created="Sat, 10 Dec 2016 22:41:40 +0000"/>
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