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Ted Yu commented on HBASE-6466: ------------------------------- +1 on patch v4. > Enable multi-thread for memstore flush > -------------------------------------- > > Key: HBASE-6466 > URL: https://issues.apache.org/jira/browse/HBASE-6466 > Project: HBase > Issue Type: Improvement > Reporter: chunhui shen > Assignee: chunhui shen > Attachments: HBASE-6466.patch, HBASE-6466v2.patch, > HBASE-6466v3.1.patch, HBASE-6466v3.patch, HBASE-6466-v4.patch > > > If the KV is large or Hlog is closed with high-pressure putting, we found > memstore is often above the high water mark and block the putting. > So should we enable multi-thread for Memstore Flush? > Some performance test data for reference, > 1.test environment : > random writting;upper memstore limit 5.6GB;lower memstore limit 4.8GB;400 > regions per regionserver;row len=50 bytes, value len=1024 bytes;5 > regionserver, 300 ipc handler per regionserver;5 client, 50 thread handler > per client for writing > 2.test results: > one cacheFlush handler, tps: 7.8k/s per regionserver, Flush:10.1MB/s per > regionserver, appears many aboveGlobalMemstoreLimit blocking > two cacheFlush handlers, tps: 10.7k/s per regionserver, Flush:12.46MB/s per > regionserver, > 200 thread handler per client & two cacheFlush handlers, tps:16.1k/s per > regionserver, Flush:18.6MB/s per regionserver -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira