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https://issues.apache.org/jira/browse/FLINK-17012?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17091088#comment-17091088
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Wenlong Lyu commented on FLINK-17012:
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I have come up the same question about init too earlier. I think if we want to
do init in constructor, there would be no abstract `init`, every StreamTask
should init itself part in its constructor: StreamTask only init the common
part of resource such as statebackend and operator, and SourceStreamTask or
OneInputStreamTask init it special part in the constructor.
> 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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