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Posted to issues@flink.apache.org by "Till Rohrmann (JIRA)" <ji...@apache.org> on 2017/06/13 08:41:00 UTC
[jira] [Closed] (FLINK-6833) Race condition: Asynchronous
checkpointing task can fail completed StreamTask
[ https://issues.apache.org/jira/browse/FLINK-6833?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Till Rohrmann closed FLINK-6833.
--------------------------------
Resolution: Fixed
Fix Version/s: 1.4.0
1.3.1
1.4.0: ab2fc023047662b650af6e6625196bd72cbb30a0
1.3.1: a3103c2ddd6b8a7566b8fd27f3acd695b4b345c7
> Race condition: Asynchronous checkpointing task can fail completed StreamTask
> -----------------------------------------------------------------------------
>
> Key: FLINK-6833
> URL: https://issues.apache.org/jira/browse/FLINK-6833
> Project: Flink
> Issue Type: Bug
> Components: Local Runtime, State Backends, Checkpointing
> Affects Versions: 1.3.0, 1.4.0
> Reporter: Till Rohrmann
> Assignee: Till Rohrmann
> Priority: Critical
> Fix For: 1.3.1, 1.4.0
>
>
> A {{StreamTask}} which is about to finish and thus transitioning its containing {{Task}} into the {{ExecutionState.FINISHED}} state, can be failed by a concurrent asynchronous checkpointing operation. The problem is that upon termination the {{StreamTask}} cancels all concurrent operations (amongst others ongoing asynchronous checkpoints). The cancellation of the async checkpoint triggers the {{StreamTask#handleAsyncException}} call which will fail the containing {{Task}}. If the {{handleAsyncException}} completes before the {{StreamTask}} has been properly terminated, then the containing {{Task}} will transition into {{ExecutionState.FAILED}} instead of {{ExecutionState.FINISHED}}.
> In order to resolve this race condition, we should check in the {{StreamTask#handleAsyncException}} whether the {{StreamTask}} is still running or has already been terminated. Only in the former case, we should fail the containing {{Task}}.
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