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https://issues.apache.org/jira/browse/HDFS-13811?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16984758#comment-16984758
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Yiqun Lin commented on HDFS-13811:
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Hi [~LiJinglun], I take a look for the major change of the patch. I am agreed
with that updating mount table statestore behavior should be called only by
admin call and let periodic service update the local cache. This will broken
one thing that the usage in mount table cannot be updated. And the quota usage
displayed in web UI will be invalid. How do we plan to fix this?
> RBF: Race condition between router admin quota update and periodic quota
> update service
> ---------------------------------------------------------------------------------------
>
> Key: HDFS-13811
> URL: https://issues.apache.org/jira/browse/HDFS-13811
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Dibyendu Karmakar
> Assignee: Jinglun
> Priority: Major
> Attachments: HDFS-13811-000.patch, HDFS-13811-HDFS-13891-000.patch,
> HDFS-13811.001.patch, HDFS-13811.002.patch, HDFS-13811.003.patch
>
>
> If we try to update quota of an existing mount entry and at the same time
> periodic quota update service is running on the same mount entry, it is
> leading the mount table to _inconsistent state._
> Here transactions are:
> A - Quota update service is fetching mount table entries.
> B - Quota update service is updating the mount table with current usage.
> A' - User is trying to update quota using admin cmd.
> and the transaction sequence is [ A A' B ]
> quota update service is updating the mount table with old quota value.
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