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Posted to dev@flink.apache.org by "Dian Fu (JIRA)" <ji...@apache.org> on 2017/12/09 03:49:00 UTC

[jira] [Created] (FLINK-8227) Optimize the performance of SharedBufferSerializer

Dian Fu created FLINK-8227:
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             Summary: Optimize the performance of SharedBufferSerializer
                 Key: FLINK-8227
                 URL: https://issues.apache.org/jira/browse/FLINK-8227
             Project: Flink
          Issue Type: Bug
          Components: CEP
            Reporter: Dian Fu
            Assignee: Dian Fu


Currently {{SharedBufferSerializer.serialize()}} will create a HashMap and put all the {{SharedBufferEntry}} into it. Usually this is not a problem. But we obverse that in some cases the calculation of hashCode may become the bottleneck. The performance will decrease as the number of {{SharedBufferEdge}} increases. For looping pattern {{A*}}, if the number of {{SharedBufferEntry}} is {{N}}, the number of {{SharedBufferEdge}} is about {{N * N}}.



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