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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <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-2132] data loss when use a small chunksize</title>
                <link>https://jira.mongodb.org/browse/SERVER-2132</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When using mongoimport tool to insert sample data (100000000 rows totally), &lt;br/&gt;
if chunkSize is set to 50MB, there is about 20000 rows data lost . &lt;br/&gt;
But when using default chunkSize (200MB) , there is No data loss.&lt;/p&gt;

&lt;p&gt;The shard environment contains 2 Shards , 2 Shards + 2 Replicas, 4 Shards + 4 Replicas.&lt;br/&gt;
Once chunkSize is set to 50MB, the data must be lost.&lt;/p&gt;

&lt;p&gt;When chunkSize is set to 50MB, the mongos log contains too many autosplit failure.such as&lt;br/&gt;
ERROR: splitIfShould failed: locking namespace failed&lt;br/&gt;
or &lt;br/&gt;
ERROR: saving chunks failed.&lt;/p&gt;

&lt;p&gt;I think the autosplit process failure is normal when use small chunkSize.&lt;br/&gt;
But the data loss is weird.&lt;/p&gt;

&lt;p&gt;the attachment contains all logs when using 2 shards.&lt;/p&gt;</description>
                <environment>OS: Red Hat Enterprise Linux AS release 4 . Kernal: 2.6.9_5 x86_64&lt;br/&gt;
mongodb version: mongodb-linux-x86_64-static-legacy-1.6.3&lt;br/&gt;
</environment>
        <key id="13769">SERVER-2132</key>
            <summary>data loss when use a small chunksize</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="-1">Unassigned</assignee>
                                    <reporter username="tullyliu">Tao Liu</reporter>
                        <labels>
                    </labels>
                <created>Mon, 22 Nov 2010 08:15:31 +0000</created>
                <updated>Tue, 12 Jul 2016 00:19:12 +0000</updated>
                            <resolved>Mon, 11 Apr 2011 18:25:22 +0000</resolved>
                                    <version>1.6.3</version>
                                                    <component>Stability</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="20621" author="tullyliu" created="Tue, 23 Nov 2010 07:05:16 +0000"  >&lt;p&gt;Thanks a lot. Admire.&lt;/p&gt;</comment>
                            <comment id="20619" author="eliot" created="Tue, 23 Nov 2010 06:47:36 +0000"  >&lt;p&gt;Resolving - please comment if you have any other issues with this.&lt;/p&gt;

&lt;p&gt;For reference, 1.6.5 should be out next monday after a week of burn in.&lt;/p&gt;</comment>
                            <comment id="20618" author="eliot" created="Tue, 23 Nov 2010 06:47:01 +0000"  >&lt;p&gt;Yes - exactly.&lt;/p&gt;</comment>
                            <comment id="20617" author="tullyliu" created="Tue, 23 Nov 2010 06:44:04 +0000"  >&lt;p&gt;I have tryed the test with 1.6.5-RC1, the problem can not be reproduced.&lt;br/&gt;
Does the bug of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-2068&quot; title=&quot;Check chunk boundaries of delete operations during chunk migration&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-2068&quot;&gt;&lt;del&gt;SERVER-2068&lt;/del&gt;&lt;/a&gt; lead to this problem?&lt;/p&gt;</comment>
                            <comment id="20614" author="eliot" created="Tue, 23 Nov 2010 02:43:42 +0000"  >&lt;p&gt;Please try with 1.6.5 first.&lt;br/&gt;
There is a bug we fixed there that is likely the culprit.&lt;/p&gt;</comment>
                            <comment id="20612" author="tullyliu" created="Tue, 23 Nov 2010 02:40:26 +0000"  >&lt;p&gt;The attachment files have contained all the logs in the test process.&lt;br/&gt;
I have tryed the same test with 1.6.4RC0 and the problem can be reproduced.&lt;/p&gt;

&lt;p&gt;I will try the test with 1.7.3 and 1.6.5, but I prefer to choose a stable release in our production enviorment.&lt;br/&gt;
I want to confirm the data loss can be avoided when the chunkSize is set to 200MB.&lt;/p&gt;</comment>
                            <comment id="20580" author="eliot" created="Mon, 22 Nov 2010 12:45:52 +0000"  >&lt;p&gt;Can you send the full logs?&lt;br/&gt;
Also - would you mind trying the same test with 1.7.3 or 1.6.5&lt;/p&gt;</comment>
                    </comments>
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                            <attachment id="10612" name="mongologs.zip" size="454995" author="tullyliu" created="Mon, 22 Nov 2010 08:15:31 +0000"/>
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