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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7878) recoverFileLease does not check return value of recoverLease
Date Fri, 22 Feb 2013 07:50:15 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13584067#comment-13584067

ramkrishna.s.vasudevan commented on HBASE-7878:

Thanks Uma for the detailed explanation. :)
bq. How about HDFS expose an API like, fs.isFileClosed(src). If recovery successfully completed,
file should have been closed
Yes something of this sort is needed.

I remember we discussed about having an api exposed from HDFS.  Any HBAse can loop but the
wait time is what we are not sure.

> 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
>            Reporter: Eric Newton
>            Assignee: Ted Yu
>            Priority: Critical
>             Fix For: 0.96.0, 0.94.6
>         Attachments: 7878-trunk-v1.txt, 7878-trunk-v2.txt, 7878-trunk-v3.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
> I think FSHDFSUtils should be modified to check the return result, and wait until it
returns true.

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