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From Josh Elser <>
Subject Re: HBase and Accumulo
Date Wed, 19 Aug 2015 18:24:13 GMT
Oh, one other thing that I should mention (was prompted off-list).

(definition time since cross-list now: HBase regions == Accumulo tablets)

Accumulo will handle many more regions than HBase does now due to a 
splittable metadata table. While I was told this was a very long and 
arduous journey to implement correctly (WRT splitting, merges and bulk 
loading), users with "too many regions" problems are extremely few and 
far between for Accumulo.

I was very happy to see effort/design being put into this in HBase. And, 
just to be fair in criticism/praises, HBase does appear to me to do 
assignments of regions much faster than Accumulo does on a small cluster 
(~5-10 nodes). Accumulo may take a few seconds to notice and reassign 
tablets. I have yet to notice this with HBase (which also could be due 
to lack of personal testing).

Jerry He wrote:
> Hi, folks
> We have people that are evaluating HBase vs Accumulo.
> Security is an important factor.
> But I think after the Cell security was added in HBase, there is no more
> real gap compared to Accumulo.
> I know we have both HBase and Accumulo experts on this list.
> Could someone shred more light?
> I am looking for real gap comparing HBase to Accumulo if there is any so
> that I can be prepared to address them. This is not limited to the security
> area.
> There are differences in some features and implementations. But they don't
> see like real 'gaps'.
> Any comments and feedbacks are welcome.
> Thanks,
> Jerry

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