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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-32759] Add the support to insert a value into the new unique index format</title>
                <link>https://jira.mongodb.org/browse/SERVER-32759</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The schema for the new index format would match the existing non-unique format. The unique constraint checking would be done in the integration layer rather than relying on WiredTiger. For an insert operation into new unique index implement the Unique Index Constraint checking algorithm to guarantee the uniqueness.&lt;/p&gt;

&lt;p&gt;The Unique Index Constraint checking algorithm is explained in the design.&lt;/p&gt;</description>
                <environment></environment>
        <key id="484275">SERVER-32759</key>
            <summary>Add the support to insert a value into the new unique index format</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="13201">Fixed</resolution>
                                        <assignee username="neha.khatri">Neha Khatri</assignee>
                                    <reporter username="neha.khatri">Neha Khatri</reporter>
                        <labels>
                    </labels>
                <created>Thu, 18 Jan 2018 04:41:48 +0000</created>
                <updated>Mon, 30 Oct 2023 23:09:14 +0000</updated>
                            <resolved>Thu, 22 Feb 2018 10:59:17 +0000</resolved>
                                                    <fixVersion>3.7.3</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1812466" author="xgen-internal-githook" created="Thu, 22 Feb 2018 04:15:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;neha.khatr@mongodb.com&apos;, &apos;name&apos;: &apos;nehakhatri5&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32759&quot; title=&quot;Add the support to insert a value into the new unique index format&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32759&quot;&gt;&lt;del&gt;SERVER-32759&lt;/del&gt;&lt;/a&gt; Insert, remove and read support for new unique index format.&lt;/p&gt;

&lt;p&gt;Added insert, remove and read support for the new index format.&lt;br/&gt;
Disabled new index format for _id index.&lt;br/&gt;
Support new format inserts on secondary too.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8e67bade9a4acb7688895a59645034babb71f7c0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8e67bade9a4acb7688895a59645034babb71f7c0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1802653" author="milkie" created="Mon, 12 Feb 2018 13:53:36 +0000"  >&lt;p&gt;Good question; I think you should add new functionality to KeyString to extract a Key.&lt;/p&gt;</comment>
                            <comment id="1802421" author="neha.khatri" created="Mon, 12 Feb 2018 06:10:29 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=milkie&quot; class=&quot;user-hover&quot; rel=&quot;milkie&quot;&gt;milkie&lt;/a&gt; When we insert a key into a unique index with the new format, first we would try to search for that key in the table using WT &lt;tt&gt;search_near&lt;/tt&gt;. This might return an adjacent record rather than an exact match. The key of that adjacent record can be extracted using &lt;tt&gt;get_key&lt;/tt&gt; API. However this key would be of format ({ 10.0 }, RecordId 5). To be able to detect a conflicting insert we should be able to extract {10.0} part from the key.&lt;/p&gt;

&lt;p&gt;Currently there is function &lt;tt&gt;KeyString::decodeRecordIdAtEnd(const void* bufferRaw, size_t bufSize)&lt;/tt&gt; to extract the RecordID from a key string. Is it possible to decode the Key in similar way?&lt;/p&gt;

&lt;p&gt;One way to detect the duplicate key would be to decode Key from the Key buffer returned by &lt;tt&gt;get_key&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;Another way of detection is:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Decode the RecordId (decodedId) from the Key returned by &lt;tt&gt;search_near&lt;/tt&gt; using &lt;tt&gt;decodeRecordIdAtEnd&lt;/tt&gt;.&lt;/li&gt;
	&lt;li&gt;Compose a new KeyString &lt;tt&gt;newKey(key, decodedId )&lt;/tt&gt;.&lt;/li&gt;
	&lt;li&gt;Compare the composed KeyString buffer and Key buffer(WT_ITEM) returned by &lt;tt&gt;search_near&lt;/tt&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;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-top: 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;std::memcmp(newKey.getBuffer(), item.data, newKey.getSize()) == 0&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;
&lt;p&gt;A match indicates duplicate key.&lt;/p&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
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                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="370803">SERVER-28619</issuekey>
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            <issuekey id="484280">SERVER-32760</issuekey>
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            <issuekey id="485461">SERVER-32820</issuekey>
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