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From D P <>
Subject Re: WAL Log - Real-time updates
Date Wed, 22 Oct 2014 18:30:01 GMT
The lily indexer/SEP is really interesting.  Thanks for both of your posts

On Wed, Oct 22, 2014 at 2:07 PM, Sean Busbey <> wrote:

> the way this gets done in HBase, i.e. for the HBase Lily Indexer[1], is to
> add a replication consumer that isn't an actual cluster. IMHO, you'd be
> better off taking that kind of approach rather than trying to consume the
> WALs off of HDFS. I haven't attempted to use our replication interface for
> this yet, but in principle it should work.
> Note that either of these approaches are going to be very fragile across
> Accumulo versions because they aren't interfaces intended for consumption.
> [1]:
> On Wed, Oct 22, 2014 at 12:59 PM, D P <> wrote:
>> I am working with Accumulo and looking for the best means of knowing when
>> something has been updated/inserted into my Accumulo instance.  For
>> instance, every-time data is inserted, how can I know externally?  If the
>> write-ahead log file stores this, is it best to just read the HDFS WAL log
>> with a storm spout to know when something has been inserted into a table?
>> I am planning to do some real-time visualization with accumulo, but when
>> data is inserted I want to be able to notify my UI.
>> Thanks!
> --
> Sean

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