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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-12908] balancer aggressively retries when inconsistency is detected</title>
                <link>https://jira.mongodb.org/browse/SERVER-12908</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;div class=&quot;panel&quot; style=&quot;background-color: #EEEEEE;border-color: #ccc;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;border-bottom-color: #ccc;background-color: #6CB33F;&quot;&gt;&lt;b&gt;Issue Status as of March 28, 2014&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #EEEEEE;&quot;&gt;
&lt;p&gt;&lt;b&gt;ISSUE SUMMARY&lt;/b&gt;&lt;br/&gt;
MongoDB contains logic to automatically detect inconsistencies between config servers. If an inconsistency is detected during a balancer round, the usual sleep time is skipped and the balancer immediately retries. This leads to fast balancer retries which always fail. &lt;/p&gt;

&lt;p&gt;&lt;b&gt;USER IMPACT&lt;/b&gt;&lt;br/&gt;
Apart from frequent queries on the config database and potentially high volume of logging messages, there is no serious impact of this bug.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;SOLUTION&lt;/b&gt;&lt;br/&gt;
The balancer now honors the sleep time even if it detects a config server inconsistency.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;WORKAROUNDS&lt;/b&gt;&lt;br/&gt;
None&lt;/p&gt;

&lt;p&gt;&lt;b&gt;AFFECTED VERSIONS&lt;/b&gt;&lt;br/&gt;
Versions 2.4.6 to 2.4.9 are affected by this bug. Before 2.4.6, the balancer did not check for config server inconsistency.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;PATCHES&lt;/b&gt;&lt;br/&gt;
The fix is included in the 2.4.10 production release and the 2.6.0-rc1 release candidate, which will evolve into the 2.6.0 production release.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;


&lt;h6&gt;&lt;a name=&quot;OriginalDescription&quot;&gt;&lt;/a&gt;Original Description&lt;/h6&gt;

&lt;p&gt;Non-regression, but pretty annoying.&lt;/p&gt;

&lt;p&gt;Basically if isConfigServerConsistent() is ever false in the balancer loop, we&apos;ll immediately retry instead of sleeping the normal &quot;sleepTime&quot;.  This leads to fast balancer retries which always fail.&lt;/p&gt;</description>
                <environment></environment>
        <key id="114854">SERVER-12908</key>
            <summary>balancer aggressively retries when inconsistency is detected</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="greg_10gen">Greg Studer</assignee>
                                    <reporter username="greg_10gen">Greg Studer</reporter>
                        <labels>
                    </labels>
                <created>Wed, 26 Feb 2014 15:47:33 +0000</created>
                <updated>Mon, 11 Jul 2016 17:18:35 +0000</updated>
                            <resolved>Mon, 3 Mar 2014 17:12:35 +0000</resolved>
                                                    <fixVersion>2.4.10</fixVersion>
                    <fixVersion>2.6.0-rc1</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="512215" author="xgen-internal-githook" created="Mon, 10 Mar 2014 01:00:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;gregstuder&apos;, u&apos;name&apos;: u&apos;Greg Studer&apos;, u&apos;email&apos;: u&apos;greg@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12908&quot; title=&quot;balancer aggressively retries when inconsistency is detected&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12908&quot;&gt;&lt;del&gt;SERVER-12908&lt;/del&gt;&lt;/a&gt; don&apos;t aggressively retry when config inconsistency detected in balancer&lt;br/&gt;
Branch: v2.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/14e868877c82d3b01544187516245631faaf458e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/14e868877c82d3b01544187516245631faaf458e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="508104" author="xgen-internal-githook" created="Mon, 3 Mar 2014 17:11:40 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;gregstuder&apos;, u&apos;name&apos;: u&apos;Greg Studer&apos;, u&apos;email&apos;: u&apos;greg@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12908&quot; title=&quot;balancer aggressively retries when inconsistency is detected&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12908&quot;&gt;&lt;del&gt;SERVER-12908&lt;/del&gt;&lt;/a&gt; don&apos;t aggressively retry when config inconsistency detected in balancer&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1ffdd358b9fa048794a09bbc644f6043dde15eeb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1ffdd358b9fa048794a09bbc644f6043dde15eeb&lt;/a&gt;&lt;/p&gt;</comment>
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