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https://issues.apache.org/jira/browse/FLINK-3387?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15169035#comment-15169035
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Stephan Ewen commented on FLINK-3387:
-------------------------------------
No, there cannot be a static instance, which would then be shared between
parallel tasks and result in concurrent modifications.
There should be one instance per state instance, that is reused across method
calls.
> Replace all ByteArrayOutputStream and DataOutputStream use in State Backends
> by DataOutputSerializer
> ----------------------------------------------------------------------------------------------------
>
> Key: FLINK-3387
> URL: https://issues.apache.org/jira/browse/FLINK-3387
> Project: Flink
> Issue Type: Bug
> Components: state backends
> Affects Versions: 1.0.0
> Reporter: Stephan Ewen
> Assignee: Subhobrata Dey
>
> Currently, the {{byte[]}} to object conversion and vice versa is always done
> by creating new byte array streams and Data Input/Output streams. That is
> pretty wasteful, we can optimize this with Flink's own classes:
> - {{DataInputSerializer}}
> - {{DataOutputSerializer}}
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