Vladimir Rodionov commented on HBASE-16685:

One handler blocked for hours is OK as long as we have 100 of them. I do not 
see any issue here. I do not mind changing code if it is not a big one though.  
Master does not have direct dependencies on M/R I think - only on backup 

> Revisit execution of SnapshotCopy in MapReduceBackupCopyService
> ---------------------------------------------------------------
>                 Key: HBASE-16685
>                 URL: https://issues.apache.org/jira/browse/HBASE-16685
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Ted Yu
>              Labels: backup
> During code review of backup / restore, Matteo raised comment on the 
> following code:
> {code}
>         res = snapshotCp.run(options);
> {code}
> I think this will be a first time where HBase server has a direct dependency 
> on a MR job.
> also we need to revisit this code to avoid having one handler blocked for N 
> hours while we are doing a copy.
> This issue is to address the above comment.

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