Github user StephanEwen commented on a diff in the pull request:
https://github.com/apache/flink/pull/1386#discussion_r46773363
--- Diff:
flink-core/src/main/java/org/apache/flink/api/common/functions/RuntimeContext.java
---
@@ -65,6 +65,22 @@
int getIndexOfThisSubtask();
/**
+ * Gets the attempt number of this parallel subtask. First attempt is
numbered 0.
--- End diff --
I would add here something like: "The attempt number corresponds to how
many times the task has been restarted (after a failure or cancellation) since
the job was initially started."
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