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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-4123] fsync/lock blocks the progress of mongodump</title>
                <link>https://jira.mongodb.org/browse/SERVER-4123</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;fsync/lock is only supposed to prevent writes.  But in a recent dba training class, we tried to do a backup on a slave by applying this and then using mongodump on it, only to discover that mongodump was blocked until the lock was released.  Since mongodump only does queries, why is it blocked?&lt;/p&gt;

&lt;p&gt;Understand that locking is not required in this case (unlike file copies), but it is reasonable to use it if a guarantee of self-consistency for the server is required.&lt;/p&gt;</description>
                <environment></environment>
        <key id="23938">SERVER-4123</key>
            <summary>fsync/lock blocks the progress of mongodump</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="3">Duplicate</resolution>
                                        <assignee username="mathias@mongodb.com">Mathias Stearn</assignee>
                                    <reporter username="cwestin">Chris Westin</reporter>
                        <labels>
                    </labels>
                <created>Fri, 21 Oct 2011 22:35:11 +0000</created>
                <updated>Sat, 4 Feb 2012 22:46:51 +0000</updated>
                            <resolved>Thu, 27 Oct 2011 04:51:59 +0000</resolved>
                                                                                        <votes>0</votes>
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                            <comment id="62977" author="eliot" created="Thu, 27 Oct 2011 04:52:00 +0000"  >&lt;p&gt;See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-4143&quot; title=&quot;Replication should pause during fsync+lock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-4143&quot;&gt;&lt;del&gt;SERVER-4143&lt;/del&gt;&lt;/a&gt; &lt;/p&gt;</comment>
                            <comment id="62887" author="cwestin" created="Wed, 26 Oct 2011 20:08:20 +0000"  >&lt;p&gt;Yes, I know, but we weren&apos;t doing any other writes.  The replica set is quiescent, just having sat there while I was lecturing.  Then we set out to do this on a secondary, and got blocked.&lt;/p&gt;</comment>
                            <comment id="62036" author="scotthernandez" created="Sat, 22 Oct 2011 21:18:54 +0000"  >&lt;p&gt;If you fsync+lock and then do a write from another thread/client it will block all readers, no? Greedy write locks are like this.&lt;/p&gt;</comment>
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