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From "Manukranth Kolloju (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-9904) Solve skipping data in HTable scans
Date Wed, 06 Nov 2013 19:00:18 GMT
Manukranth Kolloju created HBASE-9904:
-----------------------------------------

             Summary: Solve skipping data in HTable scans
                 Key: HBASE-9904
                 URL: https://issues.apache.org/jira/browse/HBASE-9904
             Project: HBase
          Issue Type: Bug
          Components: Client
    Affects Versions: 0.89-fb
            Reporter: Manukranth Kolloju
             Fix For: 0.89-fb


The HTable client cannot retry a scan operation in the getRegionServerWithRetries code path.
This will result in the client missing data. This can be worked around using hbase.client.retries.number
to 1.

The whole problem is that Callable knows nothing about retries and the protocol it dances
to as well doesn't support retires.
This fix will keep Callable protocol (ugly thing worth merciless refactoring) intact but will
change
ScannerCallable to anticipate retries. What we want is to make failed operations to be identities
for outside world:
N1 , N2 , F3 , N3 , F4 , F4 , N4 ... = N1 , N2 , N3 , N4 ...
where Nk are successful operation and Fk are failed operations.



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