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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>
    </build-info>


<item>
            <title>[SERVER-13115] Delete operations should parse queries without holding locks, when possible.</title>
                <link>https://jira.mongodb.org/browse/SERVER-13115</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-10159&quot; title=&quot;Evaluate performance of new update framework and first pass optimization&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-10159&quot;&gt;&lt;del&gt;SERVER-10159&lt;/del&gt;&lt;/a&gt;/&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12380&quot; title=&quot;port update improvements to batch write commands&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12380&quot;&gt;&lt;del&gt;SERVER-12380&lt;/del&gt;&lt;/a&gt;, the update paths were modified to parse queries outside the write lock, when possible.  This improves concurrency among writes, and between reads and writes, by minimizing time spent with data locks held.&lt;/p&gt;

&lt;p&gt;The same optimization could be applied to the delete path in a straightforward way.  See the implementation of the UpdateExecutor and its use in the BatchWriteExecutor for example.&lt;/p&gt;</description>
                <environment></environment>
        <key id="119069">SERVER-13115</key>
            <summary>Delete operations should parse queries without holding locks, when possible.</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="schwerin@mongodb.com">Andy Schwerin</assignee>
                                    <reporter username="schwerin@mongodb.com">Andy Schwerin</reporter>
                        <labels>
                            <label>26qa</label>
                    </labels>
                <created>Mon, 10 Mar 2014 16:42:55 +0000</created>
                <updated>Mon, 11 Jul 2016 17:16:31 +0000</updated>
                            <resolved>Wed, 12 Mar 2014 19:09:42 +0000</resolved>
                                    <version>2.6.0-rc1</version>
                                    <fixVersion>2.6.0-rc2</fixVersion>
                                    <component>Write Ops</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="514629" author="xgen-internal-githook" created="Wed, 12 Mar 2014 20:33:19 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13115&quot; title=&quot;Delete operations should parse queries without holding locks, when possible.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13115&quot;&gt;&lt;del&gt;SERVER-13115&lt;/del&gt;&lt;/a&gt; add error codes&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1da2d21ffe90db991715127bd4140bcc83abb98b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1da2d21ffe90db991715127bd4140bcc83abb98b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="514444" author="xgen-internal-githook" created="Wed, 12 Mar 2014 18:50:34 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;andy10gen&apos;, u&apos;name&apos;: u&apos;Andy Schwerin&apos;, u&apos;email&apos;: u&apos;schwerin@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13115&quot; title=&quot;Delete operations should parse queries without holding locks, when possible.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13115&quot;&gt;&lt;del&gt;SERVER-13115&lt;/del&gt;&lt;/a&gt; Create DeleteExecutor to facilitate unlocked query parsing in delete operations.&lt;/p&gt;

&lt;p&gt;Follows the pattern of the UpdateExecutor.  Applies the optimization to legacy&lt;br/&gt;
and command form deletes.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4b96cf10a83f1d34eb7264d0e42c343eae0da60b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4b96cf10a83f1d34eb7264d0e42c343eae0da60b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="514443" author="xgen-internal-githook" created="Wed, 12 Mar 2014 18:50:31 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;andy10gen&apos;, u&apos;name&apos;: u&apos;Andy Schwerin&apos;, u&apos;email&apos;: u&apos;schwerin@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13115&quot; title=&quot;Delete operations should parse queries without holding locks, when possible.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13115&quot;&gt;&lt;del&gt;SERVER-13115&lt;/del&gt;&lt;/a&gt; Move isQueryIsolated() into QueryPlannerCommon.&lt;/p&gt;

&lt;p&gt;This method is useful outside of the update code where it was originally&lt;br/&gt;
implemented, so this patch moves it to the utility class QueryPlannerCommon.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4ddba591cf7defc9aca5e9cab526e9c9a8941a95&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4ddba591cf7defc9aca5e9cab526e9c9a8941a95&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="513468" author="schwerin" created="Tue, 11 Mar 2014 17:23:03 +0000"  >&lt;p&gt;I&apos;ve revised this ticket to only focus on the delete path, from which the sysbench benchmark saw performance improvements. Applying the optimization meaningfully to the find path is less straightforward, because the power of the optimization comes in part from not generating a CanonicalQuery at all when it is unnecessary.  That is not a simple change to the find path.&lt;/p&gt;</comment>
                            <comment id="512895" author="schwerin" created="Mon, 10 Mar 2014 21:39:52 +0000"  >&lt;p&gt;And what do you see for 2.4.9?  There&apos;s a lot of variability per host, I&apos;ve noticed.&lt;/p&gt;</comment>
                            <comment id="512888" author="davide.italiano" created="Mon, 10 Mar 2014 21:31:28 +0000"  >&lt;p&gt;Just to play devil&apos;s advocate, I&apos;m not completely sure moving out of the lock scope the canonicalization step &lt;b&gt;for find operations&lt;/b&gt; will buy as a lot, at least not in the &apos;sysbench-like&apos; workload proposed in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12878&quot; title=&quot;Aggregations that do not return cursors need to clean up internal cursors&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12878&quot;&gt;&lt;del&gt;SERVER-12878&lt;/del&gt;&lt;/a&gt;, and honestly I&apos;m not completely sure it&apos;s worth the effort considering all the risks, for now. I ended up with a superhacky patch that accomplish that, and these are the results. &lt;/p&gt;

&lt;p&gt;Canonicalization out of the lock scope:&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;
		&lt;tbody &gt;
				&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;   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; Min.   :246.2  &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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; 1st Qu.:251.0  &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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; Median :255.2  &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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; Mean   :258.5  &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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; 3rd Qu.:263.6  &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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; Max.   :288.4  &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;Canonicalization under lock scope&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;
		&lt;tbody &gt;
				&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;   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;
		&lt;/tr&gt;
				&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; Min.   :236.6  &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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; 1st Qu.:240.7  &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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; Median :243.1  &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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; Mean   :245.1  &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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; 3rd Qu.:246.3  &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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; Max.   :264.4  &lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</comment>
                            <comment id="512622" author="alvin" created="Mon, 10 Mar 2014 16:54:11 +0000"  >&lt;p&gt;Attached is an analysis from the logs of running a workload on 2.4.9 and RC1. There is a clear difference in the duration of the lock during remove (the blue dots) in RC1, so this would support the case that the optimization in update could be relevant to remove as well.&lt;/p&gt;</comment>
                    </comments>
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                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="114400">SERVER-12878</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
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                <attachments>
                            <attachment id="39206" name="SERVER-12878-249-writelock.png" size="410482" author="alvin" created="Mon, 10 Mar 2014 16:54:11 +0000"/>
                            <attachment id="39207" name="SERVER-12878-rc1-writelock.png" size="179221" author="alvin" created="Mon, 10 Mar 2014 16:54:11 +0000"/>
                            <attachment id="39224" name="canonicalization_lock.png" size="29288" author="davide.italiano" created="Mon, 10 Mar 2014 21:31:28 +0000"/>
                            <attachment id="39239" name="canonicalization_lock2.png" size="39922" author="davide.italiano" created="Tue, 11 Mar 2014 01:04:11 +0000"/>
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