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https://issues.apache.org/jira/browse/FLINK-17012?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17084073#comment-17084073
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Stephan Ewen commented on FLINK-17012:
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The "Deferred switch to RUNNING" would implicitly expose the "initialization
time" as the time between the state-change timestamps.
The biggest blocker back then was that state is only initialized once the
thread is already in the "invoke()" method. The easiest fix would be to
"eagerly initialize" the state backend in the constructor of the Stream Task.
> Expose stage of task initialization
> -----------------------------------
>
> Key: FLINK-17012
> URL: https://issues.apache.org/jira/browse/FLINK-17012
> Project: Flink
> Issue Type: Improvement
> Components: Runtime / Metrics, Runtime / Task
> Reporter: Wenlong Lyu
> Priority: Major
>
> Currently a task switches to running before fully initialized, does not take
> state initialization and operator initialization(#open ) in to account, which
> may take long time to finish. As a result, there would be a weird phenomenon
> that all tasks are running but throughput is 0.
> I think it could be good if we can expose the initialization stage of tasks.
> What to you think?
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