Karan Mehta created HBASE-18097:
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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.
{code}
// In every RPC response there should be at most a single partial result.
Furthermore, if
// there is a partial result, it is guaranteed to be in the last position
of the array.
{code}
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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