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From "Karan Mehta (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-18042) Client Compatibility breaks between versions 1.2 and 1.3
Date Fri, 12 May 2017 18:05:04 GMT
Karan Mehta created HBASE-18042:

             Summary: Client Compatibility breaks between versions 1.2 and 1.3
                 Key: HBASE-18042
                 URL: https://issues.apache.org/jira/browse/HBASE-18042
             Project: HBase
          Issue Type: Bug
            Reporter: Karan Mehta

OpenTSDB uses AsyncHBase as its client, rather than using the traditional HBase Client. From
version 1.2 to 1.3, the {{ClientProtos}} have been changed. Newer fields are added to {{ScanResponse}}

For a typical Scan request in 1.2, would require caller to make an OpenScanner Request, GetNextRows
Request and a CloseScanner Request, based on {{more_rows}} boolean field in the {{ScanResponse}}

However, from 1.3, new parameter {{more_results_in_region}} was added, which limits the results
per region. Therefore the client has to now manage sending all the requests for each region.
Further more, if the results are exhausted from a particular region, the {{ScanResponse}}
will set {{more_results_in_region}} to false, but {{more_results}} can still be true. Whenever
the former is set to false, the {{RegionScanner}} will also be closed. 

OpenTSDB makes an OpenScanner Request and receives all its results in the first {{ScanResponse}}
itself, thus creating a condition as described in above paragraph. Since {{more_rows}} is
true, it will proceed to send next request at which point the {{RSRpcServices}} will throw
{{UnknownScannerException}}. The protobuf client compatibility is maintained but expected
behavior is modified.

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