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From "Brahma Reddy Battula (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-13811) RBF: Race condition between router admin quota update and periodic quota update service
Date Tue, 25 Jun 2019 05:52:00 GMT

     [ https://issues.apache.org/jira/browse/HDFS-13811?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Brahma Reddy Battula updated HDFS-13811:
----------------------------------------
    Parent Issue: HDFS-14603  (was: HDFS-13891)

> 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: Dibyendu Karmakar
>            Priority: Major
>         Attachments: HDFS-13811-000.patch, HDFS-13811-HDFS-13891-000.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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