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https://issues.apache.org/jira/browse/FLINK-12351?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17181081#comment-17181081
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Wenlong Lyu commented on FLINK-12351:
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[~pnowojski] As I known, it is easy to get whether the op is the head of chain
by: StreamConfig#isChainStart
> AsyncWaitOperator should deep copy StreamElement when object reuse is enabled
> -----------------------------------------------------------------------------
>
> Key: FLINK-12351
> URL: https://issues.apache.org/jira/browse/FLINK-12351
> Project: Flink
> Issue Type: Bug
> Components: API / DataStream
> Reporter: Jark Wu
> Assignee: Jark Wu
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Currently, AsyncWaitOperator directly put the input StreamElement into
> {{StreamElementQueue}}. But when object reuse is enabled, the StreamElement
> is reused, which means the element in {{StreamElementQueue}} will be
> modified. As a result, the output of AsyncWaitOperator might be wrong.
> An easy way to fix this might be deep copy the input StreamElement when
> object reuse is enabled, like this:
> https://github.com/apache/flink/blob/blink/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/async/AsyncWaitOperator.java#L209
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