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From "Dian Fu (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (FLINK-8227) Optimize the performance of SharedBufferSerializer
Date Mon, 01 Jan 2018 04:24:00 GMT

     [ 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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