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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-17118] moveChunk is slow with wired tiger</title>
                <link>https://jira.mongodb.org/browse/SERVER-17118</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Comparing to 2.6 and MMAPv1, moveChunk is slow with wired tiger.&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;td class=&apos;confluenceTd&apos;&gt; Version &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; shard01 =&amp;gt; shard02 _waitForDelete: false &lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; 2.6 &lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt; 7017 ms &lt;/td&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; 8150 ms &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; 21762 ms &lt;/td&gt;
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                <environment></environment>
        <key id="181549">SERVER-17118</key>
            <summary>moveChunk is slow with wired tiger</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="3">Duplicate</resolution>
                                        <assignee username="schwerin@mongodb.com">Andy Schwerin</assignee>
                                    <reporter username="siyuan.zhou@mongodb.com">Siyuan Zhou</reporter>
                        <labels>
                            <label>28qa</label>
                    </labels>
                <created>Thu, 29 Jan 2015 20:28:53 +0000</created>
                <updated>Sat, 9 Jul 2016 21:09:21 +0000</updated>
                            <resolved>Mon, 2 Feb 2015 20:55:01 +0000</resolved>
                                    <version>3.0.0-rc7</version>
                                                    <component>Sharding</component>
                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="819470" author="siyuan.zhou@10gen.com" created="Mon, 2 Feb 2015 20:30:49 +0000"  >&lt;p&gt;Further investigation shows that it&apos;s ConfigCoordinator who sends &quot;fsync&quot; commands to config servers, not SyncClusterConnection. SyncClusterConnection uses { &quot;getlasterror&quot;: 1, &quot;fsync&quot; : 1 } instead, which doesn&apos;t flush files if journaling is enabled. ConfigCoordinator is used by both mongos and mongod for writing to config servers.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-17151&quot; title=&quot;Avoid fsync command in ConfigCoordinator&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-17151&quot;&gt;&lt;del&gt;SERVER-17151&lt;/del&gt;&lt;/a&gt; has been filed to track this bug. Perhaps we can close this ticket as a dup since the most important reason is &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-17151&quot; title=&quot;Avoid fsync command in ConfigCoordinator&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-17151&quot;&gt;&lt;del&gt;SERVER-17151&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
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                            <attachment id="63270" name="move_from.nodelete.pdf" size="13906" author="siyuan.zhou@mongodb.com" created="Thu, 29 Jan 2015 20:30:42 +0000"/>
                            <attachment id="63271" name="move_to.nodelete.pdf" size="17159" author="siyuan.zhou@mongodb.com" created="Thu, 29 Jan 2015 20:30:42 +0000"/>
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