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https://issues.apache.org/jira/browse/FLINK-1005?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aljoscha Krettek closed FLINK-1005.
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Resolution: Fixed
> Add different mutable-object modes to runtime
> ---------------------------------------------
>
> Key: FLINK-1005
> URL: https://issues.apache.org/jira/browse/FLINK-1005
> Project: Flink
> Issue Type: Improvement
> Components: Local Runtime
> Affects Versions: 0.6-incubating
> Reporter: Stephan Ewen
> Assignee: Aljoscha Krettek
> Fix For: 0.8-incubating
>
>
> Currently, the runtime works strictly with mutable objects. That means that
> as few objects as possible (typically one or two) are reused for the data
> records all the time. Objects are cloned/restored, though, at various places
> to ensure that the contents is fresh at every call.
> The rational behind this was to reduce pressure on the garbage collector. In
> fact, you can run programs where no garbage collection happens (if the UDFs
> are written to reuse objects as well).
> It can, however, lead to bugs in not-carefully written user code.
> I propose to add two modes to the runtime:
> - No-object-reuse (default) mode. New objects for every record. Safe but
> potentially slower.
> - Object-reusing mode - All objects are reused, without backup copies.. The
> UDFs must be careful to not keep any objects as state or not to modify the
> objects,
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