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From "Nicolas Liochon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7878) recoverFileLease does not check return value of recoverLease
Date Wed, 27 Mar 2013 15:11:15 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13615364#comment-13615364
] 

Nicolas Liochon commented on HBASE-7878:
----------------------------------------

bq. Another is through SplitLogWorker.
So when we have the distributed log on (the default) it's done by the region server. Would
it make sense to have it done by the master even before distributing the tasks to the region
servers: this way the NN would do the recovery while we're distributing the tasks. 
                
> recoverFileLease does not check return value of recoverLease
> ------------------------------------------------------------
>
>                 Key: HBASE-7878
>                 URL: https://issues.apache.org/jira/browse/HBASE-7878
>             Project: HBase
>          Issue Type: Bug
>          Components: util
>    Affects Versions: 0.95.0, 0.94.6
>            Reporter: Eric Newton
>            Assignee: Ted Yu
>            Priority: Critical
>             Fix For: 0.95.0, 0.98.0
>
>         Attachments: 7878.94, 7878-94.addendum, 7878-94.addendum2, 7878-addendum.txt,
7878-trunk.addendum, 7878-trunk.addendum2, 7878-trunk-v10.txt, 7878-trunk-v11-test.txt, 7878-trunk-v12.txt,
7878-trunk-v13.txt, 7878-trunk-v14.txt, 7878-trunk-v15.patch, 7878-trunk-v16.txt, 7878-trunk-v2.txt,
7878-trunk-v3.txt, 7878-trunk-v4.txt, 7878-trunk-v5.txt, 7878-trunk-v6.txt, 7878-trunk-v7.txt,
7878-trunk-v8.txt, 7878-trunk-v9.txt, 7878-trunk-v9.txt
>
>
> I think this is a problem, so I'm opening a ticket so an HBase person takes a look.
> Apache Accumulo has moved its write-ahead log to HDFS. I modeled the lease recovery for
Accumulo after HBase's lease recovery.  During testing, we experienced data loss.  I found
it is necessary to wait until recoverLease returns true to know that the file has been truly
closed.  In FSHDFSUtils, the return result of recoverLease is not checked. In the unit tests
created to check lease recovery in HBASE-2645, the return result of recoverLease is always
checked.
> I think FSHDFSUtils should be modified to check the return result, and wait until it
returns true.

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