[hbase] When a scanner lease times out, throw a more "user friendly" exception
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Key: HADOOP-2388
URL: https://issues.apache.org/jira/browse/HADOOP-2388
Project: Hadoop
Issue Type: Improvement
Components: contrib/hbase
Reporter: Jim Kellerman
Priority: Trivial
Currently, if a client spends too much time between next() requests on a
scanner (or between scanner creation and the first call to next), the region
server will time out the scanner and close. The next call to next() will
receive an UnknownScannerException because all knowledge of the scanner was
wiped out on the server when the lease expired.
The the client side scanner should keep a timer so it compute the elapsed time
between next() calls so that if it receives an UnknownScannerException, it can
determine if the scanner lease timed out and if so, throw a more "user
friendly" exception such as LeaseTimedOutException
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