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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-8752] Improve visibility of Balancer operation</title>
                <link>https://jira.mongodb.org/browse/SERVER-8752</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;What the balancer is actually currently doing can be opaque.  In times when the shards are out of balance and do not appear to be balancing, and where there is no good indication in the logs indicating an issue with the balancer, it would be useful to have some way of querying what the balancer is actually doing.&lt;/p&gt;

&lt;p&gt;The locks collection does not give you enough information, as you can only reliably tell if the balancer is on or not, or if it is currently in a balancing round.  You can&apos;t tell if the balancer is currently calculating, or moving a chunk or not able to move chunks for some reason that is not an error.  In either case, having more insight into what the balancer is currently doing would help diagnose issues.&lt;/p&gt;

&lt;p&gt;If there is a location or object to store state of the balancer this could make it available to be queried from the shell or drivers, given that additional logging may not be the solution&lt;/p&gt;</description>
                <environment></environment>
        <key id="66600">SERVER-8752</key>
            <summary>Improve visibility of Balancer operation</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="david.hows">David Hows</assignee>
                                    <reporter username="andre.defrere@mongodb.com">Andre de Frere</reporter>
                        <labels>
                            <label>cap-ticket-needed</label>
                            <label>community-team</label>
                            <label>pull-request</label>
                    </labels>
                <created>Wed, 27 Feb 2013 06:18:44 +0000</created>
                <updated>Wed, 22 Mar 2017 15:27:42 +0000</updated>
                            <resolved>Mon, 11 Aug 2014 18:44:13 +0000</resolved>
                                                    <fixVersion>2.7.5</fixVersion>
                                    <component>Sharding</component>
                                        <votes>5</votes>
                                    <watches>14</watches>
                                                                                                                <comments>
                            <comment id="690607" author="xgen-internal-githook" created="Thu, 14 Aug 2014 14:39:35 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;daveh86&apos;, u&apos;name&apos;: u&apos;daveh86&apos;, u&apos;email&apos;: u&apos;howsdav@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-8752&quot; title=&quot;Improve visibility of Balancer operation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-8752&quot;&gt;&lt;del&gt;SERVER-8752&lt;/del&gt;&lt;/a&gt; Fixed &apos;what&apos; field value in Actionlog&lt;/p&gt;

&lt;p&gt;Closes #744&lt;/p&gt;

&lt;p&gt;Signed-off-by: Benety Goh &amp;lt;benety@mongodb.com&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1f5428d02542074a49e054172f4dac46b06fd97b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1f5428d02542074a49e054172f4dac46b06fd97b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="690605" author="benety.goh" created="Thu, 14 Aug 2014 14:38:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;daveh86&apos;, u&apos;name&apos;: u&apos;David Hows&apos;, u&apos;email&apos;: u&apos;howsdav@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-8752&quot; title=&quot;Improve visibility of Balancer operation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-8752&quot;&gt;&lt;del&gt;SERVER-8752&lt;/del&gt;&lt;/a&gt; Add config.actionlog&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cf2917a1e94959a696642407425f89fe14ccb1b4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cf2917a1e94959a696642407425f89fe14ccb1b4&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="488478" author="david.hows" created="Mon, 27 Jan 2014 22:58:23 +0000"  >&lt;p&gt;Little bit of scope creep. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12472&quot; title=&quot;Fail MoveChunk if an index is needed on TO shard and data exists&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12472&quot;&gt;&lt;del&gt;SERVER-12472&lt;/del&gt;&lt;/a&gt; is around failing a migration when indexes are missing. Increasing visibility would be worthwhile for that case too.&lt;/p&gt;

&lt;p&gt;There is also an option for a command which would review all the indexes on each of the shards.&lt;/p&gt;</comment>
                    </comments>
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