Karan Mehta created HBASE-18042:
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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}} proto.
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}} proto.
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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