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Duo Zhang commented on HBASE-18042: ----------------------------------- I haven't added any new fields in HBASE-17489... You can see the patch... > 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 > Affects Versions: 1.3.1 > Reporter: Karan Mehta > Assignee: 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. -- This message was sent by Atlassian JIRA (v6.3.15#6346)