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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-10203] Improve the number of test vectors for the hashed indexes.</title>
                <link>https://jira.mongodb.org/browse/SERVER-10203</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I am working on a capability to target requests to a mongos based on the mongod server hosting the data within a sharded cluster.&lt;/p&gt;

&lt;p&gt;For &quot;normal&quot; indexes (ascending and descending) this is easy enough and shows promise in improving performance.&lt;/p&gt;

&lt;p&gt;For hashed indexes I ran into the issue that there was exactly 1 test case that I could find to ensure my hashing of the index is consistent with MongoDB&apos;s.&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;struct HasherUnitTest : public StartupTest {&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    void run() {&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        // Hard-coded check to ensure the hash function is consistent across platforms&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        BSONObj o = BSON( &quot;check&quot; &amp;lt;&amp;lt; 42 );&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        verify( BSONElementHasher::hash64( o.firstElement(), 0 ) == -944302157085130861LL );&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;} hasherUnitTest;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;This seems a little &quot;under specified&quot; to me.  I created a more complete test suite of &quot;test vectors&quot; and figured it is probably a useful thing to have in the baseline to ensure future changes that modify the hashing indexes will be more likely to be caught.&lt;/p&gt;

&lt;p&gt;Pull Request coming soon...&lt;/p&gt;</description>
                <environment>Testing.</environment>
        <key id="82234">SERVER-10203</key>
            <summary>Improve the number of test vectors for the hashed indexes.</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="sverch">Shaun Verch</assignee>
                                    <reporter username="robert.j.moore@allanbank.com">Robert Moore</reporter>
                        <labels>
                            <label>pull-request</label>
                    </labels>
                <created>Mon, 15 Jul 2013 01:07:10 +0000</created>
                <updated>Mon, 11 Jul 2016 17:40:06 +0000</updated>
                            <resolved>Thu, 8 Aug 2013 16:04:12 +0000</resolved>
                                    <version>2.4.5</version>
                                                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="398728" author="auto" created="Thu, 8 Aug 2013 15:48:07 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;allanbank&apos;, u&apos;name&apos;: u&apos;Robert J. Moore&apos;, u&apos;email&apos;: u&apos;Robert.J.Moore@allanbank.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-10203&quot; title=&quot;Improve the number of test vectors for the hashed indexes.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-10203&quot;&gt;&lt;del&gt;SERVER-10203&lt;/del&gt;&lt;/a&gt;: Add new hasher unit tests and consolidate with old hasher dbtests&lt;/p&gt;

&lt;p&gt;Signed-off-by: Shaun Verch &amp;lt;shaun.verch@10gen.com&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a97f74585b958bd9c4a3f28d91a8049aa5286504&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a97f74585b958bd9c4a3f28d91a8049aa5286504&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="385849" author="robert.j.moore@allanbank.com" created="Sun, 21 Jul 2013 20:42:19 +0000"  >&lt;p&gt;Just a quick note that I fixed one of the tests, clarified a second and added a third to the pull request.&lt;/p&gt;</comment>
                            <comment id="380963" author="robert.j.moore@allanbank.com" created="Mon, 15 Jul 2013 01:20:23 +0000"  >&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/pull/452&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/pull/452&lt;/a&gt;&lt;/p&gt;</comment>
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