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From Ted Malaska <>
Subject Re: HBase and Accumulo
Date Wed, 19 Aug 2015 18:32:57 GMT
Yeah is you have more then a Quadrillion records in you design let me know
I would love to help out.

Ted Malaska

On Wed, Aug 19, 2015 at 2:30 PM, Josh Elser <> wrote:

> Like I've said many times now, it's relative to your actual problem. If
> you don't have that much data (or intend to grow into that much data), it's
> not an issue. Obviously, this is the case for you.
> However, it is an architectural difference between the two projects with
> known limitations for a single metadata region. It's a difference as what
> was asked for by Jerry.
> Ted Malaska wrote:
>> I've been doing HBase for a long time and never had an issue with region
>> count limits and I have clusters with 10s of billions of records.  Many
>> there would be issues around a couple Trillion records, but never got that
>> high yet.
>> Ted Malaska
>> On Wed, Aug 19, 2015 at 2:24 PM, Josh Elser<>  wrote:
>> 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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