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    <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-17151] Avoid fsync command in ConfigCoordinator</title>
                <link>https://jira.mongodb.org/browse/SERVER-17151</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Write command to config server will send fsync command first before executing write operations. This causes sharding operations (e.g. moveChunk) slow on wired tiger, because sharding operations write changelogs to config server and fsync is expensive on wired tiger.&lt;/p&gt;</description>
                <environment></environment>
        <key id="182067">SERVER-17151</key>
            <summary>Avoid fsync command in ConfigCoordinator</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="kaloian.manassiev@mongodb.com">Kaloian Manassiev</assignee>
                                    <reporter username="siyuan.zhou@mongodb.com">Siyuan Zhou</reporter>
                        <labels>
                            <label>28qa</label>
                    </labels>
                <created>Mon, 2 Feb 2015 20:23:21 +0000</created>
                <updated>Mon, 11 Jan 2016 00:15:47 +0000</updated>
                            <resolved>Tue, 3 Mar 2015 15:54:53 +0000</resolved>
                                    <version>3.0.0-rc7</version>
                                    <fixVersion>3.1.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>1</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="841627" author="xgen-internal-githook" created="Tue, 3 Mar 2015 15:53:07 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kaloianm&apos;, u&apos;name&apos;: u&apos;Kaloian Manassiev&apos;, u&apos;email&apos;: u&apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: &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; ConfigCoordinator should not call fsync&lt;/p&gt;

&lt;p&gt;This is expensive to do, especially with WiredTiger and is not a&lt;br/&gt;
deterministic check. This change replaces it with something cheaper, but&lt;br/&gt;
has the same outcome - validates that previous writes were successfully&lt;br/&gt;
journaled, which is an approximate predictor that subsequent writes have&lt;br/&gt;
high chance of succeeding.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/41986e669a4ef32b38c433a2cfd0b70e872e6899&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/41986e669a4ef32b38c433a2cfd0b70e872e6899&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="175858">SERVER-16638</issuekey>
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            <issuekey id="184534">SERVER-17300</issuekey>
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            <issuekey id="181549">SERVER-17118</issuekey>
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