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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-4908] FileAllocator seems to take database lock. Is this needed?</title>
                <link>https://jira.mongodb.org/browse/SERVER-4908</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When FileAllocator worked, the whole of database seems to be locked during allocating physical data file.&lt;br/&gt;
The following log was written.&lt;/p&gt;

&lt;p&gt; &lt;span class=&quot;error&quot;&gt;&amp;#91;FileAllocator&amp;#93;&lt;/span&gt; done allocating datafile /data/mongo/data/hoge1.5, size: 2047MB,  took 21.081 secs&lt;/p&gt;

&lt;p&gt;On this time, read/write operation was queued and timed out.&lt;br/&gt;
To avoid request timeout, we tried pre-preallocation by the following procedure.&lt;/p&gt;

&lt;p&gt;1. creating database and collection at mongo console.&lt;br/&gt;
2. creating &quot;.n&quot; files and filling with zero.&lt;br/&gt;
3. creating large collection and confirm that FileAllocator did not create files and no request timeout occurred.&lt;/p&gt;

&lt;p&gt;That is worked fine.&lt;br/&gt;
If possible, make FileAllocator free from locking.&lt;/p&gt;
</description>
                <environment>centos 5.6, 64bit, use 3 node replica, non sharding</environment>
        <key id="30161">SERVER-4908</key>
            <summary>FileAllocator seems to take database lock. Is this needed?</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="9">Done</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="hitoshi.asai@gmo-media.jp">Hitoshi Asai</reporter>
                        <labels>
                            <label>FileAllocator</label>
                            <label>lock</label>
                    </labels>
                <created>Wed, 8 Feb 2012 09:46:46 +0000</created>
                <updated>Wed, 29 Feb 2012 03:54:10 +0000</updated>
                            <resolved>Thu, 9 Feb 2012 05:18:44 +0000</resolved>
                                    <version>2.0.2</version>
                                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="86843" author="hitoshi.asai@gmo-media.jp" created="Thu, 9 Feb 2012 12:17:14 +0000"  >&lt;p&gt;our system uses ext3 and inserts data faster than pre-allocation finishes.&lt;br/&gt;
we will try to use ext4.&lt;br/&gt;
thanks a lot!&lt;/p&gt;</comment>
                            <comment id="86793" author="eliot" created="Thu, 9 Feb 2012 05:18:44 +0000"  >&lt;p&gt;background file allocation is done without any lock&lt;/p&gt;

&lt;p&gt;if you are inserting data faster than pre-allocation can keep up, then there can be a pause if you need a new file to insert data.&lt;/p&gt;

&lt;p&gt;if allocation is taking that long - you probably are not a new enough file system. try xfs or ext4.&lt;/p&gt;</comment>
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