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From "Karan Mehta (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-18097) Client can save 1 RPC call for CloseScannerRequest
Date Wed, 24 May 2017 01:29:04 GMT
Karan Mehta created HBASE-18097:

             Summary: Client can save 1 RPC call for CloseScannerRequest
                 Key: HBASE-18097
                 URL: https://issues.apache.org/jira/browse/HBASE-18097
             Project: HBase
          Issue Type: Improvement
            Reporter: Karan Mehta

Starting version 1.3, HBase automatically closes scanner on server side whenever the results
are exhausted and corresponding bits are set in the {{ScanResponse}} proto returned to the
client. We can use that info to eliminate the closeScanRequest RPC call, thereby saving 1
RPC per region per scan. This can be particularly useful for tables with more regions.

Also, currently the {{ScanResponse}} proto sends out 1 bit per {{Result}} that it has embeds
inside the {{CellScanner}} to indicate if it is partial or not. 
    // In every RPC response there should be at most a single partial result. Furthermore,
    // there is a partial result, it is guaranteed to be in the last position of the array.
According to client, only the last result can be partial, thus this repeated bool can be converted
to a bool, thus reducing overhead of serialization and deserialization of the array. This
will break wire compatibility therefore this is something to look for in upcoming versions.

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