I am wondering if an unhandled exception in a mapper task (or a reducer task) would make the task failed or only the particular input pair of the time would be ignored? I guess it is the former but not so sure.
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I am wondering if an unhandled exception in a mapper task (or a reducer task) would make the task failed or only the particular input pair of the time would be ignored? I guess it is the former but not so sure.
If the exception is not recurring (i.e. a retry will succeed), then it will fail the task but the task will be retried (or a speculative execution running in parallel may proceed). If the exception will always occur (e.g. there is bad input data) then retries will continue to fail and eventually the whole job will fail.