[ https://issues.apache.org/jira/browse/HBASE-18097?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Karan Mehta updated HBASE-18097: -------------------------------- Summary: Save bandwidth on partial_flag_per_result in ScanResponse proto (was: Client can save 1 RPC call for CloseScannerRequest) > Save bandwidth on partial_flag_per_result in ScanResponse proto > --------------------------------------------------------------- > > Key: HBASE-18097 > URL: https://issues.apache.org/jira/browse/HBASE-18097 > Project: HBase > Issue Type: Improvement > Affects Versions: 1.3.2 > 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)