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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-23354] Implement sh.balancerReset() feature to recover unresponsive balancer control</title>
                <link>https://jira.mongodb.org/browse/SERVER-23354</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;New feature request, &lt;tt&gt;sh.balancerReset()&lt;/tt&gt; or similar, to avoid the manual labor of attempting control recovery of unresponsive shard balancer conditions.&lt;/p&gt;

&lt;p&gt;Proposed function analyzes the config database for balancer state.  If the &lt;tt&gt;mongos&lt;/tt&gt; process listed as having the lock is unresponsive, it should presume that mongos is down and attempt to take the balancer lock itself.  If it can, then, it proceeds and tells everyone it has the lock now, etc.&lt;/p&gt;

&lt;p&gt;The goal of this is to fix up situations where issuing a command, &lt;tt&gt;sh.stopBalancer()&lt;/tt&gt; never times-out or error-out, etc.  It should be completely fast and deterministic and easy and invisible to most users.&lt;/p&gt;</description>
                <environment></environment>
        <key id="275147">SERVER-23354</key>
            <summary>Implement sh.balancerReset() feature to recover unresponsive balancer control</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="scott.kurowski@mongodb.com">Scott Kurowski</reporter>
                        <labels>
                    </labels>
                <created>Fri, 25 Mar 2016 18:35:56 +0000</created>
                <updated>Tue, 6 Dec 2022 04:29:44 +0000</updated>
                            <resolved>Thu, 31 Mar 2016 17:52:26 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1221504" author="schwerin" created="Thu, 31 Mar 2016 17:52:26 +0000"  >&lt;p&gt;Since moving the balancer to the CSRS primary will obviate this, I&apos;m closing this as &quot;Won&apos;t Fix&quot;.&lt;/p&gt;</comment>
                            <comment id="1221502" author="schwerin" created="Thu, 31 Mar 2016 17:51:00 +0000"  >&lt;p&gt;With &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22669&quot; title=&quot;CSRS balancer supports parallel migrations&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22669&quot;&gt;&lt;del&gt;SERVER-22669&lt;/del&gt;&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22673&quot; title=&quot;Update shell balancer control helpers&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22673&quot;&gt;&lt;del&gt;SERVER-22673&lt;/del&gt;&lt;/a&gt;, the CSRS primary will take control of the balancer, and so it will no longer be necessary or meaningful to take the balancer lock away from the current balancer. This is because the CSRS primary is also the distributed lock manager, so if you can write to it, the balancer will also be up and running.&lt;/p&gt;</comment>
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