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https://issues.apache.org/jira/browse/FLINK-11309?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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BoWang closed FLINK-11309.
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Resolution: Fixed
> Make SpillableSubpartition repeatably read to enable
> ----------------------------------------------------
>
> Key: FLINK-11309
> URL: https://issues.apache.org/jira/browse/FLINK-11309
> Project: Flink
> Issue Type: Sub-task
> Components: Runtime / Operators
> Affects Versions: 1.6.2, 1.7.0, 1.7.1
> Reporter: BoWang
> Assignee: BoWang
> Priority: Critical
> Labels: pull-request-available
> Time Spent: 1h
> Remaining Estimate: 0h
>
> Hi all,
> When running the batch WordCount example, I configured the job execution
> mode as *BATCH_FORCED*, and failover-strategy as *region*, I manually
> injected some errors to let the execution fail in different phases. In some
> cases, the job could recovery from failover and became succeed, but in some
> cases, the job retried several times and failed.
> Example:
> # If the failure occurred before task read data, e.g., failed before
> *invokable.invoke()* in Task.java, failover could succeed.
> # If the failure occurred after task having read data, failover did not work.
>
> Problem diagnose:
> Running the example described before, each ExecutionVertex is defined as a
> restart region, and the ResultPartitionType between executions is *BLOCKING.*
> Thus, *SpillableSubpartition* and *SpillableSubpartitionView* are used to
> write/read shuffle data, and data block is described as *BufferConsumer*
> stored in a list called *buffers,* when task requires input data from
> *SpillableSubpartitionView,* *BufferConsumer* is REMOVED from buffers. Thus,
> when failures occurred after having read data, some *BufferConsumers* have
> already released, although tasks retried, the input data is incomplete.
>
> Fix Proposal:
> # *BufferConsumer* should not be removed from buffers until
> *ExecutionVertex* terminates.
> # *SpillableSubpartition* should not be released until *ExecutionVertex*
> terminates.
> # *SpillableSubpartition* could creates multi *SpillableSubpartitionViews*,
> each of which is corresponding to a *Execution*.
> Design doc:
> https://docs.google.com/document/d/1uXuJFiKODf241CKci3b0JnaF3zQ-Wt0V9wmC7kYwX-M/edit?usp=sharing
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