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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-19122] Out-of-order _id index inserts on secondary contribute to replica lag under WiredTiger</title>
                <link>https://jira.mongodb.org/browse/SERVER-19122</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In some use cases inserts into the _id index are done in monotonically increasing _id order on the primary, and that is a case that WT optimizes for. However because of the way oplog entries are divided among the worker threads in SyncTail::fillWriterVectors on the secondary, the entries in the _id index may not be inserted in order on the secondary, and this is a less optimal path under WT. This can occur for example if multiple collections are being inserted into, one thread per collection, using a monotonic _id, such as ObjectId; in this case inserts into the _id index are in order in each WT index table on the primary, but not on the secondary. (This issue does not occur with multiple threads inserting into a single collection because the _id index inserts are not in order on either the primary or the secondary, so parity is maintained).&lt;/p&gt;

&lt;p&gt;We can control whether inserts are ordered or disordered on the primary by either&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;inserting into either 1 collection with 8 threads (disordered), or 8 separate collections with 8 threads (ordered)&lt;/li&gt;
	&lt;li&gt;using either monotonic _ids (ordered) or random _ids (disordered)&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Inserts are always disordered on the secondary, so by observing secondary performance relative to primary while varying ordering on the primary as above we can measure the relative impact of the disordered inserts on the secondary. Secondary processing rate relative to primary was measured by comparing number of entries inserted into oplog on secondary with number on primary at a particular point in time during the run:&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;
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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;                                        secondary/primary   relative&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;                                                            performance&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;8 collections, monotonic _ids		15273776/20179477 = 0.76           inserts ordered on primary, disordered on secondary&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;8 collections, random ids		17189861/20104144 = 0.86           inserts disordered on both primary and secondary&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;   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;1 collection, monotonic _ids		17123525/20187676 = 0.85           inserts disordered on both primary and secondary&lt;/span&gt;&lt;/pre&gt;
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			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Note that performance of primary relative to secondary is reduced by &lt;em&gt;either&lt;/em&gt; using random &amp;#95;ids, &lt;em&gt;or&lt;/em&gt; by inserting into a single collection with multiple threads, both of which disorder the inserts into the _id index on the primary, to match the disordered inserts on the secondary.&lt;/p&gt;

&lt;p&gt;Finally, we can achieve parity between the primary and the secondary by both&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;incorporating the &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-18983?focusedCommentId=949757&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-949757&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;potential improvement of parallelizing oplog inserts&lt;/a&gt; (both bullets below)&lt;/li&gt;
	&lt;li&gt;eliminating the issue described in this ticket by disordering the inserts on the primary by using a single collection (second bullet below)
&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;                                        secondary/primary   relative&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;                                                            performance&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;8 collections, monotonic _ids		18699167/20148811 = 0.93&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;1 collection, monotonic _ids		20056367/20060385 = 0.99&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;/li&gt;
&lt;/ul&gt;


&lt;p&gt;It&apos;s unclear whether this issue can be addressed in the mongod layer, or whether an improvement in WT for the out-of-order insertion case is needed.&lt;/p&gt;</description>
                <environment></environment>
        <key id="212870">SERVER-19122</key>
            <summary>Out-of-order _id index inserts on secondary contribute to replica lag under WiredTiger</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="bruce.lucas@mongodb.com">Bruce Lucas</reporter>
                        <labels>
                    </labels>
                <created>Wed, 24 Jun 2015 21:34:16 +0000</created>
                <updated>Tue, 6 Dec 2022 04:49:24 +0000</updated>
                            <resolved>Thu, 2 Apr 2020 20:08:04 +0000</resolved>
                                                                    <component>Replication</component>
                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>23</watches>
                                                                                                                <comments>
                            <comment id="1704709" author="daniel.gottlieb@10gen.com" created="Fri, 20 Oct 2017 14:22:45 +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; marking as 3.7 Desired - conversation at nyc storage meeting was that we will likely be doing some work on this soon.  give a shout if that&apos;s incorrect.&lt;/p&gt;</comment>
                            <comment id="1017497" author="martin.bligh" created="Fri, 28 Aug 2015 21:59:51 +0000"  >&lt;p&gt;Observation from today: Part of the &quot;out of orderness&quot; is oplog optimes on primary do not strictly match ordering of the _id&lt;/p&gt;

&lt;p&gt;Another interesting experiment ... run primary flat out for 60s. Get about 200-210K/s on primary, secondary is only getting about 140K/s.&lt;br/&gt;
After the primary completes, insert rate on secondary goes up to 200-210K/s. &lt;br/&gt;
Will investigate further if this is really due to out of order, or maybe some form of contention on the oplog handoff.&lt;/p&gt;</comment>
                            <comment id="1017211" author="martin.bligh" created="Fri, 28 Aug 2015 17:40:38 +0000"  >&lt;p&gt;Tried turning off the oplog commits on the secondary (just force commenting out in code). Even without oplog, secondary only goes half the speed of the primary.&lt;br/&gt;
Despite the primary struggling against _logOp locking issues, if I cut those out of profile, we still get the below, which I believes just reinforces what Bruce was pointing out&lt;/p&gt;

&lt;p&gt;Specifically __wt_search_insert seems to be all added overhead - Michael, is this just straight overhead of not doing an append-only insert?&lt;/p&gt;

&lt;p&gt;PRIMARY&lt;/p&gt;
&lt;p/&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;-   3.83%  mongod  mongod               [.] __wt_row_search                                                                                                        �&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;      - 88.06% __wt_btcur_insert                                                                                                                                   �&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;-   3.35%  mongod  mongod               [.] __wt_row_modify                                                                                                        �&lt;/span&gt;&lt;/pre&gt;
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			&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;
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			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;SECONDARY, no oplog&lt;/p&gt;

&lt;p/&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;-   3.26%  mongod  mongod               [.] __wt_search_insert                                                                                                     �&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;   - __wt_search_insert                                                                                                                                            �&lt;/span&gt;&lt;/pre&gt;
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		&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;      - 98.71% __wt_row_search                                                                                                                                     �&lt;/span&gt;&lt;/pre&gt;
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		&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;           __wt_btcur_insert                                                                                                                                       �&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;   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;         - __curfile_insert                                                                                                                                        �&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;            + 85.65% mongo::WiredTigerIndexUnique::_insert(__wt_cursor*, mongo::BSONObj const&amp;amp;, mongo::RecordId const&amp;amp;, bool)                                      �&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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			&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;      + 1.29% __wt_btcur_insert                                                                                                                                    �&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;-   2.54%  mongod  mongod               [.] __wt_row_search                                                                                                        �&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;
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		&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;      - 97.02% __wt_btcur_insert                                                                                                                                   �&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
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			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&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;            + 55.14% mongo::WiredTigerRecordStore::insertRecord(mongo::OperationContext*, char const*, int, bool)                                                  �&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
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			&lt;/td&gt;
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		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
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			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
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&lt;p/&gt;</comment>
                            <comment id="949871" author="bruce.lucas@10gen.com" created="Wed, 24 Jun 2015 21:49:01 +0000"  >&lt;p&gt;Created &lt;a href=&quot;https://jira.mongodb.org/browse/WT-1979&quot; title=&quot;Lower performance of out-of-order inserts can contribute to replication lag&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-1979&quot;&gt;&lt;del&gt;WT-1979&lt;/del&gt;&lt;/a&gt; to investigate whether this can be addressed in WT.&lt;/p&gt;</comment>
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