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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-16604] Improve integration with rocks</title>
                <link>https://jira.mongodb.org/browse/SERVER-16604</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Goals for completion of this ticket:&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;Different format for unique indexes. Probably the same thing that wiredtiger is doing &amp;#8211; storing duplicates as a list (as oposed to storing RecordIDs as part of keys). This should also enable using bloom filters for duplicate key checks.&lt;/li&gt;
	&lt;li&gt;Phase-out old keys in RocksTransaction. Currently all written keys ever are stored in RocksTransaction. We need to remove keys that are not being touched by any currently running transactions.&lt;/li&gt;
	&lt;li&gt;Improve rocks_engine metadata. Introduce DB version to support changes in disk format in the future.&lt;/li&gt;
	&lt;li&gt;Configure RocksDB + expose some config options to users.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;(Copied from email from the submitter)&lt;/p&gt;</description>
                <environment></environment>
        <key id="175477">SERVER-16604</key>
            <summary>Improve integration with rocks</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="9">Done</resolution>
                                        <assignee username="matt.kangas">Matt Kangas</assignee>
                                    <reporter username="igor">Igor Canadi</reporter>
                        <labels>
                    </labels>
                <created>Fri, 19 Dec 2014 12:17:10 +0000</created>
                <updated>Fri, 18 Sep 2015 22:38:08 +0000</updated>
                            <resolved>Fri, 23 Jan 2015 20:06:58 +0000</resolved>
                                                    <fixVersion>3.0.0-rc7</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="813125" author="xgen-internal-githook" created="Mon, 26 Jan 2015 16:28:07 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;igorcanadi&apos;, u&apos;name&apos;: u&apos;Igor Canadi&apos;, u&apos;email&apos;: u&apos;icanadi@fb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16604&quot; title=&quot;Improve integration with rocks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16604&quot;&gt;&lt;del&gt;SERVER-16604&lt;/del&gt;&lt;/a&gt; &lt;span class=&quot;error&quot;&gt;&amp;#91;rocks&amp;#93;&lt;/span&gt; New format for unique indexes&lt;/p&gt;

&lt;p&gt;For unique indexes, we now encode RecordId in value instead of as part&lt;br/&gt;
of the key. We keep duplicate RecordIds (when dupsAllowed == true) as a&lt;br/&gt;
list in the value. This is the same format as WiredTiger&apos;s unique&lt;br/&gt;
indexes.&lt;/p&gt;

&lt;p&gt;This format enables us to use bloom filters to avoid doing reads for&lt;br/&gt;
secondary index maintenance.&lt;/p&gt;

&lt;p&gt;This patch changes Mongo+Rocks&apos; disk format.&lt;/p&gt;

&lt;p&gt;Signed-off-by: Benety Goh &amp;lt;benety@mongodb.com&amp;gt;&lt;br/&gt;
(cherry picked from commit 7cb3be1c8c35b6f3b7903a3a2efa64b1468fd514)&lt;br/&gt;
Branch: v3.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/bf1998071a6c6650508e12d8b25cbf035d388dad&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/bf1998071a6c6650508e12d8b25cbf035d388dad&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="812132" author="benety.goh" created="Fri, 23 Jan 2015 20:06:58 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=igor&quot; class=&quot;user-hover&quot; rel=&quot;igor&quot;&gt;igor&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Please update the description to reflect the current functionality in the RocksDB storage engine. Further enhancements to the RocksDB storage engine should be reflected in new &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;SERVER&lt;/a&gt; tickets.&lt;/p&gt;

&lt;p&gt;Thank you and &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=sdong&quot; class=&quot;user-hover&quot; rel=&quot;sdong&quot;&gt;sdong&lt;/a&gt; for all your contributions!&lt;/p&gt;</comment>
                            <comment id="811883" author="xgen-internal-githook" created="Fri, 23 Jan 2015 17:10:57 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;igorcanadi&apos;, u&apos;name&apos;: u&apos;Igor Canadi&apos;, u&apos;email&apos;: u&apos;icanadi@fb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16604&quot; title=&quot;Improve integration with rocks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16604&quot;&gt;&lt;del&gt;SERVER-16604&lt;/del&gt;&lt;/a&gt; &lt;span class=&quot;error&quot;&gt;&amp;#91;rocks&amp;#93;&lt;/span&gt; New format for unique indexes&lt;/p&gt;

&lt;p&gt;For unique indexes, we now encode RecordId in value instead of as part&lt;br/&gt;
of the key. We keep duplicate RecordIds (when dupsAllowed == true) as a&lt;br/&gt;
list in the value. This is the same format as WiredTiger&apos;s unique&lt;br/&gt;
indexes.&lt;/p&gt;

&lt;p&gt;This format enables us to use bloom filters to avoid doing reads for&lt;br/&gt;
secondary index maintenance.&lt;/p&gt;

&lt;p&gt;This patch changes Mongo+Rocks&apos; disk format.&lt;/p&gt;

&lt;p&gt;Signed-off-by: Benety Goh &amp;lt;benety@mongodb.com&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7cb3be1c8c35b6f3b7903a3a2efa64b1468fd514&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7cb3be1c8c35b6f3b7903a3a2efa64b1468fd514&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="807067" author="xgen-internal-githook" created="Sat, 17 Jan 2015 02:07:37 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;igorcanadi&apos;, u&apos;name&apos;: u&apos;Igor Canadi&apos;, u&apos;email&apos;: u&apos;icanadi@fb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16604&quot; title=&quot;Improve integration with rocks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16604&quot;&gt;&lt;del&gt;SERVER-16604&lt;/del&gt;&lt;/a&gt; Use KeyString in Rocks index&lt;/p&gt;

&lt;p&gt;This patch changes disk format for the Rocks storage engine.&lt;/p&gt;

&lt;p&gt;Signed-off-by: Benety Goh &amp;lt;benety@mongodb.com&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2d7050b6c3b9d35590e7e874e6285f0a1fcb5f3d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2d7050b6c3b9d35590e7e874e6285f0a1fcb5f3d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="799775" author="xgen-internal-githook" created="Thu, 8 Jan 2015 03:05:16 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;igorcanadi&apos;, u&apos;name&apos;: u&apos;Igor Canadi&apos;, u&apos;email&apos;: u&apos;icanadi@fb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16604&quot; title=&quot;Improve integration with rocks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16604&quot;&gt;&lt;del&gt;SERVER-16604&lt;/del&gt;&lt;/a&gt; Phase out old keys in RocksTransaction&lt;/p&gt;

&lt;p&gt;Signed-off-by: Matt Kangas &amp;lt;matt.kangas@mongodb.com&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/174fe03770738005c08ed6ec61f1a95ce5542dbe&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/174fe03770738005c08ed6ec61f1a95ce5542dbe&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="791644" author="ramon.fernandez" created="Sun, 21 Dec 2014 11:10:41 +0000"  >&lt;p&gt;Thanks &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=igor&quot; class=&quot;user-hover&quot; rel=&quot;igor&quot;&gt;igor&lt;/a&gt;, please let us know when all patches for a given JIRA ticket have been merged in so we can resolve the ticket and set the right fixVersion.&lt;/p&gt;</comment>
                            <comment id="790943" author="xgen-internal-githook" created="Fri, 19 Dec 2014 17:08:32 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;igorcanadi&apos;, u&apos;name&apos;: u&apos;Igor Canadi&apos;, u&apos;email&apos;: u&apos;icanadi@fb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16604&quot; title=&quot;Improve integration with rocks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16604&quot;&gt;&lt;del&gt;SERVER-16604&lt;/del&gt;&lt;/a&gt; Stop special-casing oplog in capped collections&lt;/p&gt;

&lt;p&gt;Signed-off-by: Matt Kangas &amp;lt;matt.kangas@mongodb.com&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/53dbff5aa4407ada6b6f2416f6702be02ad26037&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/53dbff5aa4407ada6b6f2416f6702be02ad26037&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="790839" author="igor" created="Fri, 19 Dec 2014 15:44:03 +0000"  >&lt;p&gt;Sure. I&apos;m opening this just so I can tag my patches with JIRA ticket &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/smile.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/p&gt;</comment>
                            <comment id="790719" author="ramon.fernandez" created="Fri, 19 Dec 2014 12:37:34 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=igor&quot; class=&quot;user-hover&quot; rel=&quot;igor&quot;&gt;igor&lt;/a&gt;, I understand this ticket and &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16603&quot; title=&quot;Fix linking of WriteConflictException in rocks build&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16603&quot;&gt;&lt;del&gt;SERVER-16603&lt;/del&gt;&lt;/a&gt; are placeholders, so I&apos;m marking them as &quot;debugging with submitter&quot; pending further input from you.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10011">
                    <name>Depends</name>
                                            <outwardlinks description="depends on">
                                        <issuelink>
            <issuekey id="158488">SERVER-15271</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="164565">SERVER-15744</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="167142">SERVER-15932</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="169778">SERVER-16204</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="170586">SERVER-16259</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="175456">SERVER-16603</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="143903">SERVER-14352</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="175787">SERVER-16632</issuekey>
        </issuelink>
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                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="178739">SERVER-16850</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="122220">SERVER-13256</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="180038">SERVER-16979</issuekey>
        </issuelink>
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