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Duo Zhang commented on HBASE-18097: ----------------------------------- We can not change the definition in proto file, but I think we can try to find a way to only put a single value to the list, as you said, to save some data in the rpc response. I'm currently on vacation. Will be back next week. Will take a deep look at that time. Thanks. > 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. -- This message was sent by Atlassian JIRA (v6.3.15#6346)