[ http://issues.apache.org/jira/browse/HADOOP-556?page=all ]
Doug Cutting updated HADOOP-556:
--------------------------------
Status: Resolved (was: Patch Available)
Fix Version/s: 0.7.0
Resolution: Fixed
I just committed this. Thanks, Michel!
> Streaming should send keep-alive signals to Reporter every 10 seconds, not
> every 100 records
> --------------------------------------------------------------------------------------------
>
> Key: HADOOP-556
> URL: http://issues.apache.org/jira/browse/HADOOP-556
> Project: Hadoop
> Issue Type: Improvement
> Components: contrib/streaming
> Reporter: Michel Tourn
> Fix For: 0.7.0
>
> Attachments: hadoop-timedreporter.patch
>
>
> Streaming should send keep-alive signals to Reporter every 10 seconds, not
> every 100 records.
> A first version of this was already implemented but was not satisfactory.
> Now we check whether 10sec have passed:
> -after reading a *line* of Application's stderr
> (so please use as your stderr heartbeat: cerr << ".\n", not cerr << "." )
> -and after outputting a record in mapper / combiner / reducer.
> If 10 sec have passed then we set Reporter status.
> Effects:
> -the reporter status changes more often and provides useful feedback in the
> Web UI or in another client.
> -a Task will not time out after 10 minutes just because it outputs records
> slowly.
> No artificial heartbeat is introduced in this proposal.
> The streaming Application still has to show activity (either on stdout or on
> stderr)
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