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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HBASE-6856) Document the LeaseException thrown in scanner next
Date Fri, 21 Sep 2012 18:33:09 GMT

     [ https://issues.apache.org/jira/browse/HBASE-6856?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

stack resolved HBASE-6856.
--------------------------

       Resolution: Fixed
    Fix Version/s: 0.96.0
         Assignee: Daniel Iancu
     Hadoop Flags: Reviewed

Committed.  Let me push the book up to the site after this commit.  Thanks for the mailing
list distillation (and thanks Harsh for digging in on this one...)
                
> Document the LeaseException thrown in scanner next
> --------------------------------------------------
>
>                 Key: HBASE-6856
>                 URL: https://issues.apache.org/jira/browse/HBASE-6856
>             Project: HBase
>          Issue Type: Improvement
>          Components: documentation
>    Affects Versions: 0.92.0
>            Reporter: Daniel Iancu
>            Assignee: Daniel Iancu
>              Labels: LeaseException
>             Fix For: 0.96.0
>
>
> In some situations clients that fetch data from a RS get a LeaseException instead of
the usual ScannerTimeoutException/UnknownScannerException.
> This particular case should be documented in the HBase guide.
> Some key points
> * the source of exception is: org.apache.hadoop.hbase.regionserver.Leases.removeLease(Leases.java:230)
> * it happens in the context of a slow/freezing RS#next
> * it can be prevented by having  hbase.rpc.timeout > hbase.regionserver.lease.period
> Harsh J investigated the issue and has some conclusions, see
> http://mail-archives.apache.org/mod_mbox/hbase-user/201209.mbox/%3CCAOcnVr3R-LqtKhFsk8Bhrm-YW2i9O6J6Fhjz2h7q6_sxvwd2yw%40mail.gmail.com%3E

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