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https://issues.apache.org/jira/browse/FLINK-8687?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16384832#comment-16384832
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Ted Yu commented on FLINK-8687:
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Looking at LocalExecutor, I think answer is yes.
> MaterializedCollectStreamResult#retrievePage should take resultLock
> -------------------------------------------------------------------
>
> Key: FLINK-8687
> URL: https://issues.apache.org/jira/browse/FLINK-8687
> Project: Flink
> Issue Type: Bug
> Reporter: Ted Yu
> Priority: Minor
>
> Currently MaterializedCollectStreamResult#retrievePage checks page range and
> calls snapshot.subList() without holding resultLock.
> {{resultLock}} should be taken.
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