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Posted to issues@flink.apache.org by "Dian Fu (JIRA)" <ji...@apache.org> on 2018/01/01 04:24:00 UTC

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

     [ https://issues.apache.org/jira/browse/FLINK-8227?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dian Fu closed FLINK-8227.
--------------------------

> 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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