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    <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-4963] Time zone ambiguity in balancer activeWindow</title>
                <link>https://jira.mongodb.org/browse/SERVER-4963</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If a config server has activeWindow set as in the documentation: { activeWindow : &lt;/p&gt;
{ start : &quot;9:00&quot;, stop : &quot;21:00&quot; }
&lt;p&gt; }&lt;/p&gt;

&lt;p&gt;... it is ambiguous what time zone those hours are in. Mongos compares its local time to the active window:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/s/grid.cpp#L447&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/master/src/mongo/s/grid.cpp#L447&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;If mongos is running on a machine with a different time zone than whatever zone the administrator was thinking of when s/he configured the activeWindow, then mongos will balance outside the intended window. If different mongoses are in different zones, they will use different balancing windows.&lt;/p&gt;

&lt;p&gt;Suggested fixes: backward-breaking change to specify that activeWindow is time of day UTC, use universal_time() in mongos.&lt;/p&gt;

&lt;p&gt;Or, activeWindow is specified as being in the config server&apos;s time zone, and the config server implements a new command, shouldBalance, and mongoses run the command on the config server to see if they should balance now.&lt;/p&gt;

&lt;p&gt;Or, activeWindow is specified as being in the config server&apos;s time zone, and config servers report their offset from UTC so mongoses can convert the window to UTC before checking if they should balance.&lt;/p&gt;

&lt;p&gt;Or, activeWindow contains an offset which is reported to mongos.&lt;/p&gt;</description>
                <environment></environment>
        <key id="30607">SERVER-4963</key>
            <summary>Time zone ambiguity in balancer activeWindow</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="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="jesse@mongodb.com">A. Jesse Jiryu Davis</reporter>
                        <labels>
                    </labels>
                <created>Tue, 14 Feb 2012 18:47:53 +0000</created>
                <updated>Tue, 6 Dec 2022 05:36:23 +0000</updated>
                            <resolved>Thu, 31 Oct 2019 13:14:05 +0000</resolved>
                                    <version>2.0.2</version>
                    <version>2.1.0</version>
                                                    <component>Sharding</component>
                                        <votes>2</votes>
                                    <watches>9</watches>
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            <issuekey id="70519">SERVER-9216</issuekey>
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            <issuekey id="27492">SERVER-4587</issuekey>
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            <issuekey id="207820">SERVER-18785</issuekey>
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