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From Gary Helmling <ghelml...@gmail.com>
Subject Re: coprocessor status query
Date Tue, 22 Oct 2013 02:06:03 GMT
> You can't remove a coprocessor.
> Well, you can, but that would require a rolling restart.
> It still exists and is still loaded.
Assuming we are talking about RegionObserver coprocessors here, when a
coprocessor throws an exception (other than IOException), it is either:

a) removed from the list of active RegionObservers being invoked on the
region's operations
b) or if "hbase.coprocessor.abortonerror" is "true", the regionserver aborts

The coprocessor class is of course still in memory on the regionserver, but
that instance will no longer be invoked in any pre/post hooks for
operations on that region.

Back to the original question, the coprocessor is only removed from the
list of active coprocessors for the region(s) where it has thrown an
exception.  It will still be active on any regions where it has not thrown
an exception.

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