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    <title>MongoDB Jira</title>
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    <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-9478] sh.startBalancer() should retry to change the settings while waiting</title>
                <link>https://jira.mongodb.org/browse/SERVER-9478</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, running &lt;tt&gt;sh.startBalancer()&lt;/tt&gt; seems to only call &lt;tt&gt;sh.setBalancerState(true)&lt;/tt&gt; once at the beginning, then waits for the balancer lock to change (by default 30 sec).&lt;/p&gt;

&lt;p&gt;This is problematic for scripted backup procedures along these steps&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;stop balancer&lt;/li&gt;
	&lt;li&gt;stop a config server&lt;/li&gt;
	&lt;li&gt;back up ...&lt;/li&gt;
	&lt;li&gt;start the config server&lt;/li&gt;
	&lt;li&gt;start balancer&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;If there are no hard-coded timeouts between 4. and 5. the config server may miss the call to &lt;tt&gt;sh.setBalancerState(true)&lt;/tt&gt; (or reject it, if not all 3 are running yet) and then wait in the loop until timed out.&lt;/p&gt;

&lt;p&gt;Instead, it would be better if &lt;tt&gt;sh.startBalancer()&lt;/tt&gt; kept pushing the settings while in the wait loop. If the config server comes up in the mean time, it would receive the next state change and the balancer would start.&lt;/p&gt;


</description>
                <environment></environment>
        <key id="73190">SERVER-9478</key>
            <summary>sh.startBalancer() should retry to change the settings while waiting</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="thomas.rueckstiess@mongodb.com">Thomas Rueckstiess</reporter>
                        <labels>
                    </labels>
                <created>Fri, 26 Apr 2013 04:30:21 +0000</created>
                <updated>Tue, 6 Dec 2022 05:21:48 +0000</updated>
                            <resolved>Thu, 12 Jul 2018 18:51:55 +0000</resolved>
                                    <version>2.2.4</version>
                    <version>2.4.3</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="1945920" author="greg.mckeon" created="Thu, 12 Jul 2018 18:51:55 +0000"  >&lt;p&gt;Now that the balancer is on the config server, this has gone away.&lt;/p&gt;</comment>
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