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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <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-9931] hashed shard keys do not appear to handle decimal values</title>
                <link>https://jira.mongodb.org/browse/SERVER-9931</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Tried using a hashed shard key after defining an empty collection as hashed sharded. All decimal values between 0 and 1 were routed to the same shard. &lt;/p&gt;</description>
                <environment></environment>
        <key id="78985">SERVER-9931</key>
            <summary>hashed shard keys do not appear to handle decimal values</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="greg_10gen">Greg Studer</assignee>
                                    <reporter username="edouard">Edouard Servan-Schreiber</reporter>
                        <labels>
                    </labels>
                <created>Thu, 13 Jun 2013 20:08:53 +0000</created>
                <updated>Wed, 10 Dec 2014 23:11:28 +0000</updated>
                            <resolved>Wed, 27 Aug 2014 15:36:18 +0000</resolved>
                                    <version>2.4.2</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="705707" author="greg_10gen" created="Wed, 27 Aug 2014 15:40:09 +0000"  >&lt;p&gt;We don&apos;t recommend using floating-point values as shard keys - arithmetic can cause surprising results.  The current behavior is built into the hashed indexes and is not currently changeable - though a simple workaround is to transform the double value into another type if small decimal increments really are being used as unique _ids.&lt;/p&gt;</comment>
                            <comment id="359788" author="spencer" created="Thu, 13 Jun 2013 20:49:51 +0000"  >&lt;p&gt;This is a known issue, see the warning on this page: &lt;a href=&quot;http://docs.mongodb.org/manual/tutorial/shard-collection-with-a-hashed-shard-key/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/tutorial/shard-collection-with-a-hashed-shard-key/&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="150403">SERVER-14759</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="150405">SERVER-14761</issuekey>
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                            <customfieldvalue>&lt;p&gt;// Set up a sharding test.&lt;br/&gt;
var st = new ShardingTest({ shards : 4, mongos: 1, chunksize : 64, config : 1, other : { nopreallocj : 1 }});&lt;br/&gt;
st.adminCommand( &lt;/p&gt;
{ enablesharding:&quot;test&quot; }
&lt;p&gt; );&lt;br/&gt;
st.adminCommand( { shardcollection:&quot;test.hashed&quot;, key:&lt;/p&gt;
{ _id: &apos;hashed&apos; }
&lt;p&gt; } );&lt;/p&gt;

&lt;p&gt;function insertData(db, colName, num, w) {&lt;br/&gt;
&#160;&#160;&#160;&#160;start=db.serverStatus().uptimeMillis;&lt;br/&gt;
&#160;&#160;&#160;&#160;col = db.getCollection(colName);&lt;br/&gt;
    col.remove();&lt;br/&gt;
&#160;&#160;&#160;&#160;for (i = 0; i &amp;lt; num; i++) {&lt;br/&gt;
&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;col.insert({_id: Math.random()});&lt;br/&gt;
&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;db.getLastErrorObj(w); // call gle safe&lt;br/&gt;
&#160;&#160;&#160;&#160;}&lt;br/&gt;
&#160;&#160;&#160;&#160;end=db.serverStatus().uptimeMillis;&lt;br/&gt;
&#160;&#160;&#160;&#160;return ((num*1000)/(end-start));&lt;br/&gt;
}&lt;/p&gt;


&lt;p&gt;//&lt;br/&gt;
num = 50000;&lt;br/&gt;
hashed=insertData(db.getSiblingDB( &quot;test&quot; ), &apos;hashed&apos;, num,1);&lt;/p&gt;
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