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From Josh Elser <>
Subject Re: Search
Date Wed, 23 Jul 2014 21:18:12 GMT
Hmm, digging through the code, I might retract my claim.

Constraints might fire early enough in the server-side pipeline that it 
just "appears" like another client writing data. I'd need to do some 
more testing to make myself confident though :)

On 7/23/14, 5:02 PM, Donald Miner wrote:
> Can you explain the deadlock? Is it only if i have a cyclical trigger? Or is there something
> Not trying to argue my constraint approach is a good idea. It it is a bad idea.  Just
>> On Jul 23, 2014, at 4:54 PM, Josh Elser <> wrote:
>> Constraints execute server-side.
>> It might work to write to an external system but it's still bogus for proper lifecycle
methods on cleanup inside Accumulo. Writing to Accumulo within a constraint is still deadlock
prone, as well.
>>> On 7/23/14, 4:51 PM, Donald Miner wrote:
>>> We thought about this for text indexing. We found we could use Constraints as
they trigger on write. Seems like a bit of a hack and i have no idea if it would blow something
>>> Does constraint execution happen on tablet side or client side?
>>>> On Jul 23, 2014, at 4:39 PM, Roshan Punnoose <> wrote:
>>>> Is there a way to tie into the write process in Accumulo? Maybe just use
>>>> Iterator that worked on compaction to send data to blur/solr? I have seen
>>>> something similar in Cassandra, a data hook to save data in Solr.
>>>>> On Fri, Jul 18, 2014 at 6:46 PM, Nehal Mehta <>
>>>>> We were trying to do so, but adding visibility while adding/searching
>>>>> documents needs lot more thinking. Adding visibility to core search engine
>>>>> needs changes to algorithm and that does not make it very scalable.
>>>>> Integration besides granular visibility is very doable. and we had taken
>>>>> inspiration from Solandra.
>>>>> Obviously if we can get it done it adds lot of value. I believe Sqrrl
>>>>> people have already done it, are they thinking to open source it anytime
>>>>> future?
>>>>> On Thu, Jul 17, 2014 at 3:09 PM, Donald Miner <>
>>>>> wrote:
>>>>>> We briefly toyed with blur on accumulo but didnt get too far just
>>>>>> it was obe. I think that would be cool.
>>>>>>> On Jul 17, 2014, at 3:06 PM, Josh Elser <>
>>>>>>> It's definitely possible. I remember hearing about someone doing
>>>>>> on top of Accumulo once, but I don't recall seeing a nice package
with a
>>>>>> bow on top.
>>>>>>>> On 7/17/14, 2:53 PM, THORMAN, ROBERT D wrote:
>>>>>>>> What lexical search package (like lucene/solr) has anyone
put on top
>>>>> of
>>>>>> accumulo?  Is this possible or does everyone just index log files
>>>>>> documents?
>>>>>>>> v/r
>>>>>>>> Bob Thorman
>>>>>>>> Principal Big Data Engineer
>>>>>>>> AT&T Big Data CoE
>>>>>>>> 2900 W. Plano Parkway
>>>>>>>> Plano, TX 75075
>>>>>>>> 972-658-1714

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