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From "Chao Sun (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-13602) Add checkOperation(WRITE) checks in FSNamesystem
Date Wed, 30 May 2018 03:30:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-13602?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16494628#comment-16494628
] 

Chao Sun commented on HDFS-13602:
---------------------------------

Thanks [~xkrogen] for the explanation. I should have checked HDFS-5681 before the comment.

> Add checkOperation(WRITE) checks in FSNamesystem
> ------------------------------------------------
>
>                 Key: HDFS-13602
>                 URL: https://issues.apache.org/jira/browse/HDFS-13602
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: ha, namenode
>            Reporter: Erik Krogen
>            Assignee: Chao Sun
>            Priority: Major
>         Attachments: HDFS-13602.000.patch, HDFS-13602.001.patch
>
>
> Similar to the work done in HDFS-4591 to avoid having to take a write lock before checking
if an operation category is allowed, we can do the same for the write lock that is taken sometimes
(when updating access time) within getBlockLocations.
> This is particularly useful when using the standby read feature (HDFS-12943), as it will
be the case on an observer node that the operationCategory(READ) check succeeds but the operationCategory(WRITE)
check fails. It would be ideal to fail this check _before_ acquiring the write lock.



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