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    <title>MongoDB Jira</title>
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    <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>
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<item>
            <title>[SERVER-3456] Running fsync+lock on config server during backup results in blocked inserts</title>
                <link>https://jira.mongodb.org/browse/SERVER-3456</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The documentation recommends doing an fsync+lock of a config server when taking a backup of a sharded cluster, but all of my tests using this method seem to result in blocked inserts after a few seconds ( I think when it needs to split the chunk ).&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;http://www.mongodb.org/display/DOCS/Backing+Up+Sharded+Cluster&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.mongodb.org/display/DOCS/Backing+Up+Sharded+Cluster&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Environment&lt;br/&gt;
Ubuntu 10.10&lt;br/&gt;
MongoDB 1.8.2&lt;br/&gt;
3 shards&lt;br/&gt;
3 replica set members per shard&lt;br/&gt;
3 config servers&lt;br/&gt;
1 mongos&lt;br/&gt;
chunksize=1 to force splits earlier&lt;/p&gt;

&lt;p&gt;Steps to reproduce&lt;br/&gt;
1. Stop balancer&lt;br/&gt;
2. Verify balancer stopped&lt;br/&gt;
3. Run test script to generate inserts&lt;br/&gt;
4. fsync+lock config server&lt;br/&gt;
5. Wait a few seconds for block&lt;/p&gt;

&lt;p&gt;I think I can work around the issue by shutting down the config database instead of doing an fsync and lock, but wanted to check to see whether or not this was a bug or just something missing in the documentation.&lt;/p&gt;

&lt;p&gt;Thanks&lt;/p&gt;</description>
                <environment>Ubuntu 10.10</environment>
        <key id="19944">SERVER-3456</key>
            <summary>Running fsync+lock on config server during backup results in blocked inserts</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="jlee">Jeff lee</reporter>
                        <labels>
                            <label>revisit</label>
                    </labels>
                <created>Thu, 21 Jul 2011 06:01:22 +0000</created>
                <updated>Mon, 20 Jul 2015 22:15:28 +0000</updated>
                            <resolved>Mon, 20 Jul 2015 22:15:28 +0000</resolved>
                                    <version>1.8.2</version>
                                                    <component>Concurrency</component>
                    <component>Sharding</component>
                                        <votes>1</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="970438" author="schwerin" created="Mon, 20 Jul 2015 22:15:28 +0000"  >&lt;p&gt;This problem will go away with &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1448&quot; title=&quot;Host sharding config data on a replica set&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1448&quot;&gt;&lt;del&gt;SERVER-1448&lt;/del&gt;&lt;/a&gt;, scheduled for 3.2. With that ticket resolved, the backup procedure will be to fsync+lock a config replica set secondary, I believe.&lt;/p&gt;</comment>
                            <comment id="570905" author="greg_10gen" created="Fri, 2 May 2014 17:22:11 +0000"  >&lt;p&gt;This is really a documentation issue - the fsync lock is behaving as-designed.  We need to audit the backup docs and make sure we have a solution which doesn&apos;t cause further problems.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
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                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="65340">SERVER-8579</issuekey>
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                                        <issuelink>
            <issuekey id="51315">DOCS-545</issuekey>
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