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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-18902] Retrieval of documents larger that 1MB slower on WiredTiger than MMAPv1</title>
                <link>https://jira.mongodb.org/browse/SERVER-18902</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;div class=&quot;panel&quot; style=&quot;background-color: #EEEEEE;border-color: #ccc;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;border-bottom-color: #ccc;background-color: #6CB33F;&quot;&gt;&lt;b&gt;Issue Status as of Jul 14, 2015&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #EEEEEE;&quot;&gt;
&lt;p&gt;&lt;b&gt;ISSUE SUMMARY&lt;/b&gt;&lt;br/&gt;
WiredTiger does not store documents larger than its default &lt;tt&gt;leaf_value_max&lt;/tt&gt; in the in-memory cache. The &lt;tt&gt;leaf_value_max&lt;/tt&gt; value is 1 megabyte. As a result, operations that read or modify larger documents are significantly less efficient than with smaller documents.&lt;/p&gt;

&lt;p&gt;Starting with MongoDB 3.0.5 all documents are stored in the in-memory WritedTiger cache, but this change only impacts collections created after upgrading to 3.0.5 or later. Existing collections are unaffected by this change.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;USER IMPACT&lt;/b&gt;&lt;br/&gt;
Users running with the WiredTiger storage engine may observe slower performance when retrieving documents larger than 1 megabyte than when retrieving smaller documents.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;WORKAROUNDS&lt;/b&gt;&lt;br/&gt;
Users with documents larger than 1 megabyte may use the &lt;tt&gt;--wiredTigerCollectionConfigString &apos;leaf_value_max=&amp;lt;bytes&amp;gt;&apos;&lt;/tt&gt; configuration option to increase the value of &lt;tt&gt;leaf_value_max&lt;/tt&gt; beyond 1 megabyte to improve performance when accessing large documents. &lt;/p&gt;

&lt;p&gt;For example, to ask WiredTiger to put in its cache documents of up to 16 megabytes in size, use:&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;   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;--wiredTigerCollectionConfigString &apos;leaf_value_max=16000000&apos;&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;Note that this setting only impacts collections created after the change. Existing collections are not be affected by this change, so users with existing collections containing large documents may want to move them to a newly created collection, replicate them to new instances running 3.0.5, or perform a dump + restore cycle on these collections.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;AFFECTED VERSIONS&lt;/b&gt;&lt;br/&gt;
MongoDB 3.0.0 through 3.0.4.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;FIX VERSION&lt;/b&gt;&lt;br/&gt;
The fix is included in the 3.0.5 production release.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h6&gt;&lt;a name=&quot;Originaldescription&quot;&gt;&lt;/a&gt;Original description&lt;/h6&gt;

&lt;p&gt;Retrieval of large documents under MongoDB 3.0.3 and WiredTiger is significantly slower than 3.0.3 running MMAPv1.  With the following reproduction on my macbook, I saw the following execution times, running the find() operation twice to account for cold data:&lt;/p&gt;
&lt;div class=&apos;table-wrap&apos;&gt;
&lt;table class=&apos;confluenceTable&apos;&gt;&lt;tbody&gt;
&lt;tr&gt;
&lt;th class=&apos;confluenceTh&apos;&gt; Engine&lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt; First find&lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt; Second find&lt;/th&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;MMAPv1&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; 10ms &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; 0ms&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;WiredTiger&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; 5950ms&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; 5921ms&lt;/td&gt;
&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;
&lt;/div&gt;


&lt;p&gt;Increasing the leaf_value_max setting to 64000000 on mongod prior to collection creation improves performance:&lt;/p&gt;
&lt;div class=&apos;table-wrap&apos;&gt;
&lt;table class=&apos;confluenceTable&apos;&gt;&lt;tbody&gt;
&lt;tr&gt;
&lt;th class=&apos;confluenceTh&apos;&gt; Engine&lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt; First find&lt;/th&gt;
&lt;th class=&apos;confluenceTh&apos;&gt; Second find&lt;/th&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;WiredTiger&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; 1803ms&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; 590ms&lt;/td&gt;
&lt;/tr&gt;
&lt;/tbody&gt;&lt;/table&gt;
&lt;/div&gt;
</description>
                <environment></environment>
        <key id="209584">SERVER-18902</key>
            <summary>Retrieval of documents larger that 1MB slower on WiredTiger than MMAPv1</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="dan@mongodb.com">Daniel Pasette</assignee>
                                    <reporter username="james.wahlin@mongodb.com">James Wahlin</reporter>
                        <labels>
                    </labels>
                <created>Tue, 9 Jun 2015 21:30:19 +0000</created>
                <updated>Sat, 19 Sep 2015 00:04:34 +0000</updated>
                            <resolved>Fri, 12 Jun 2015 22:06:48 +0000</resolved>
                                    <version>3.0.3</version>
                                    <fixVersion>3.0.5</fixVersion>
                    <fixVersion>3.1.5</fixVersion>
                                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>18</watches>
                                                                                                                <comments>
                            <comment id="942462" author="xgen-internal-githook" created="Tue, 16 Jun 2015 23:27:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;monkey101&apos;, u&apos;name&apos;: u&apos;Dan Pasette&apos;, u&apos;email&apos;: u&apos;dan@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-18902&quot; title=&quot;Retrieval of documents larger that 1MB slower on WiredTiger than MMAPv1&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-18902&quot;&gt;&lt;del&gt;SERVER-18902&lt;/del&gt;&lt;/a&gt; Bump leaf_value_max to 64MB to keep large docs in WiredTiger cache&lt;/p&gt;

&lt;p&gt;(cherry picked from commit f32226bc1c8489a7cfff2ba2242c98b3f2efb16b)&lt;br/&gt;
Branch: v3.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/17678f50406d674fb2b3a6bcdcd00f72ae8eacc1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/17678f50406d674fb2b3a6bcdcd00f72ae8eacc1&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="939139" author="xgen-internal-githook" created="Fri, 12 Jun 2015 17:23:34 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;monkey101&apos;, u&apos;name&apos;: u&apos;Dan Pasette&apos;, u&apos;email&apos;: u&apos;dan@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-18902&quot; title=&quot;Retrieval of documents larger that 1MB slower on WiredTiger than MMAPv1&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-18902&quot;&gt;&lt;del&gt;SERVER-18902&lt;/del&gt;&lt;/a&gt; Bump leaf_value_max to 64MB to keep large docs in WiredTiger cache&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f32226bc1c8489a7cfff2ba2242c98b3f2efb16b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f32226bc1c8489a7cfff2ba2242c98b3f2efb16b&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="227649">SERVER-20197</issuekey>
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                            <customfieldvalue>&lt;p&gt;1) Setup a 2 member MongoDB 3.0.3 replica set with:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;One member running WiredTiger&lt;/li&gt;
	&lt;li&gt;One member running MMAPv1&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;2) Load a data set with large documents:&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;use test;&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;var hugeString=&quot;&quot;;&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;for (var i = 0; i &amp;lt; (1024 * 1100); i++) { hugeString = hugeString + &quot;12345&quot;; }&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;for (var j = 0; j &amp;lt; 1000; ++j) { db.test.insert({a: hugeString}); }&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;3) Run the following explain 2 times against both the WiredTiger and the MMAPv1 members:&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;use test;&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;db.test.find().explain(verbose=&apos;executionStats&apos;);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</customfieldvalue>

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