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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-18852] cannot find range (min,max) after presplit</title>
                <link>https://jira.mongodb.org/browse/SERVER-18852</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;we are running mongo cluster with 5 shards, after several month of production, we find it didn&apos;t split chunks in proper ranges, some chunks never   contain data while others are very heavy. so we decided to apply pre-split on one of online database. as the range of shard key is fixed, so we choose 4 moderate points as middle point. we didn&apos;t stop balancer when doing pre-split. and we think this is some what easy and non fatal.&lt;br/&gt;
but when we start writing to these empty and pre-splitted collections, the were still trying to autosplit, and we got &quot;cannot find range min to max&quot; error message. this may lead to slow insert performance and last about 8 hours. after the message &quot;time to load chunks &quot;, these collections start to auto split successfully. and we lost some data because of slow insert.&lt;/p&gt;

&lt;p&gt;so, I want to know are there some essential  step did i miss after pre-split? or when does &quot;time to load chunks&quot; happens?&lt;/p&gt;</description>
                <environment></environment>
        <key id="208889">SERVER-18852</key>
            <summary>cannot find range (min,max) after presplit</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="-1">Unassigned</assignee>
                                    <reporter username="usbuild">usbuild</reporter>
                        <labels>
                    </labels>
                <created>Sat, 6 Jun 2015 07:09:11 +0000</created>
                <updated>Thu, 11 Jun 2015 18:37:20 +0000</updated>
                            <resolved>Thu, 11 Jun 2015 18:37:20 +0000</resolved>
                                    <version>3.0.2</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="933388" author="ramon.fernandez" created="Sat, 6 Jun 2015 15:03:26 +0000"  >&lt;p&gt;Thanks for your report &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=usbuild&quot; class=&quot;user-hover&quot; rel=&quot;usbuild&quot;&gt;usbuild&lt;/a&gt;. Please note that the SERVER project is for reporting bugs or feature suggestions for the MongoDB server. For MongoDB-related support discussion please post on the &lt;a href=&quot;http://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-user group&lt;/a&gt; or &lt;a href=&quot;http://stackoverflow.com/questions/tagged/mongodb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Stack Overflow with the &lt;tt&gt;mongodb&lt;/tt&gt; tag&lt;/a&gt;, where your question will reach a larger audience. A question like this involving more discussion would be best posted on the &lt;a href=&quot;http://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-user group&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
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