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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-8829] String representation for chunk id is not unique</title>
                <link>https://jira.mongodb.org/browse/SERVER-8829</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;... in particular, certain numbers (numberlong, numberint) have the same representation as a string in BSON.  This leads to duplicate key errors when generating chunk ids based off these values.&lt;/p&gt;

&lt;p&gt;see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-8787&quot; title=&quot;mongos crashing when running splits + inserts on collection with hashed shard key&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-8787&quot;&gt;&lt;del&gt;SERVER-8787&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="67056">SERVER-8829</key>
            <summary>String representation for chunk id is not unique</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="3">Duplicate</resolution>
                                        <assignee username="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="greg_10gen">Greg Studer</reporter>
                        <labels>
                    </labels>
                <created>Sat, 2 Mar 2013 00:32:36 +0000</created>
                <updated>Tue, 6 Dec 2022 05:23:41 +0000</updated>
                            <resolved>Fri, 9 Aug 2019 12:31:34 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>1</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="2364367" author="kaloian.manassiev" created="Fri, 9 Aug 2019 12:31:17 +0000"  >&lt;p&gt;Starting in MongoDB 4.3, this is no longer an issue, because the _id fields of the chunks collection have been converted to be auto-generated.&lt;/p&gt;</comment>
                            <comment id="347987" author="greg_10gen" created="Wed, 29 May 2013 15:33:58 +0000"  >&lt;p&gt;Just to clarify, this bug is present in all releases of mongodb, however it is somewhat simpler to trigger using hashed shard keys (though still very rare in the wild) since int(0) and long(0) have the same string representation.  Symptoms would be a hole in the chunks collection after a split or initial split, resulting in the collection becoming unusable (though the data itself is unaffected).&lt;/p&gt;

&lt;p&gt;The workaround is simply to be consistent with types in shard keys.  We do sanity checks before splits which should detect many cases as well.  Any full fix will not be backportable.&lt;/p&gt;</comment>
                            <comment id="281071" author="greg_10gen" created="Mon, 4 Mar 2013 18:40:18 +0000"  >&lt;p&gt;Attached test reproduces problem on any 2.4, all mongo versions probably affected though.&lt;/p&gt;</comment>
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            <issuekey id="150403">SERVER-14759</issuekey>
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            <issuekey id="25869">SERVER-4411</issuekey>
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            <issuekey id="837970">SERVER-42106</issuekey>
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            <issuekey id="66836">SERVER-8787</issuekey>
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            <issuekey id="714419">SERVER-40061</issuekey>
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            <issuekey id="346634">SERVER-27734</issuekey>
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            <issuelink>
            <issuekey id="346677">SERVER-27735</issuekey>
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                            <attachment id="41714" name="bindata_sharding.js" size="2130" author="greg_10gen" created="Thu, 17 Apr 2014 14:49:52 +0000"/>
                            <attachment id="24669" name="upgrade_cluster_v3_to_v4_wait_for_mongos.js" size="2318" author="greg_10gen" created="Mon, 4 Mar 2013 18:40:18 +0000"/>
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