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From "Yiqun Lin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11951) Ozone: Handle potential inconsistent states while listing keys
Date Thu, 08 Jun 2017 09:55:18 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11951?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16042478#comment-16042478
] 

Yiqun Lin commented on HDFS-11951:
----------------------------------

[~cheersyang], I am thinking this corner case will not be happen actually. {{BucketManagerImpl}}
holds the readLock before doing list buckets operation, and  {{ReadLock}}, {{WriteLock}} are
mutual exclusive. So during this time, the delete key operations should not be happened since
delete operation will require the write lock. 
Correct me if I am wrong, :).

> Ozone: Handle potential inconsistent states while listing keys
> --------------------------------------------------------------
>
>                 Key: HDFS-11951
>                 URL: https://issues.apache.org/jira/browse/HDFS-11951
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ozone
>    Affects Versions: HDFS-7240
>            Reporter: Weiwei Yang
>            Assignee: Weiwei Yang
>
> In the discussions in HDFS-11779, there might be a corner case we running into the situation
that some key are deleted while we are listing them. For example
> 1. A list call is made say from key1 to key100 is returned.
> 2. Someone deletes the key100
> 3. A list continue call is made with startKey=key100.
> We need to investigate this case and make sure this is properly handled in ozone. See
more discussion from [here | https://issues.apache.org/jira/browse/HDFS-11779?focusedCommentId=16042356&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16042356].



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