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https://issues.apache.org/jira/browse/FLINK-5011?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Timo Walther reassigned FLINK-5011:
-----------------------------------
Assignee: Timo Walther
> TraversableSerializer does not perform a deep copy of the elements it is
> traversing
> -----------------------------------------------------------------------------------
>
> Key: FLINK-5011
> URL: https://issues.apache.org/jira/browse/FLINK-5011
> Project: Flink
> Issue Type: Bug
> Components: Core, Scala API
> Affects Versions: 1.1.3
> Reporter: Dan Bress
> Assignee: Timo Walther
> Priority: Blocker
> Labels: serialization
> Fix For: 1.2.0
>
>
> I had an issue where the state in my rolling window was incorrectly being
> maintained from window to window.
> *The initial state of my window looked like this:*
> {code}
> Map[Key, MutableValue] = {("A", Value(0)}, ("B", Value(0)}
> {code}
> *Then in Window 0 I update the state so it looks like this at the close of
> the window:*
> {code}
> Map[Key, MutableValue] = {("A", Value(1)}, ("B", Value(3)}
> {code}
> *Then at the start of Window 1 the state looks like it did at the end of
> Window 0:*
> {code}
> Map[Key, MutableValue] = {("A", Value(1)}, ("B", Value(3)}
> {code}
> *when I expected it to look like the initial state:*
> {code}
> Map[Key, MutableValue] = {("A", Value(0)}, ("B", Value(0)}
> {code}
> It looks like
> [TraversableSerializer|https://github.com/apache/flink/blob/master/flink-scala/src/main/scala/org/apache/flink/api/scala/typeutils/TraversableSerializer.scala#L65-L69]
> is doing a shallow copy of the elements in the traversable instead of a deep
> copy
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