Christopher, This is interesting! Could you please give me more details about this?
Thanks, Thai On Thu, Dec 3, 2015 at 12:17 PM, Christopher <ctubb...@apache.org> wrote: > You could also implement a constraint to notify an external system when a > row is updated. > > On Wed, Dec 2, 2015, 22:54 Josh Elser <josh.el...@gmail.com> wrote: > >> oops :) >> >> [1] http://fluo.io/ >> >> Josh Elser wrote: >> > Hi Thai, >> > >> > There is no out-of-the-box feature provided with Accumulo that does what >> > you're asking for. Accumulo doesn't provide any functionality to push >> > notifications to other systems. You could potentially maintain other >> > tables/columns in which you maintain the last time a row was updated, >> > but the onus is on your "other services" to read the table to find out >> > when a change occurred (which is probably not scalable at "real time"). >> > >> > There are other systems you could likely leverage to solve this, >> > depending on the durability and scalability that your application needs. >> > >> > For a system "close" to Accumulo, you could take a look at Fluo [1] >> > which is an implementation of Google's "Percolator" system. This is a >> > system based on throughput rather than low-latency, so it may not be a >> > good fit for your needs. There are probably other systems in the Apache >> > ecosystem (Kafka, Storm, Flink or Spark Streaming maybe?) that are be >> > helpful to your problem. I'm not an expert on these to recommend on (nor >> > do I think I understand your entire architecture well enough). >> > >> > Thai Ngo wrote: >> >> Hi list, >> >> >> >> I have a use-case when existing rows in a table will be updated by an >> >> internal service. Data in a row of this table is composed of 2 parts: >> >> 1st part - immutable and the 2nd one - will be updated (filled in) a >> >> little later. >> >> >> >> Currently, I have a need of knowing when and which rows will be updated >> >> in the table so that other services will be wisely start consuming the >> >> data. It will make more sense when I need to consume the data in near >> >> realtime. So developing a notification function or simpler - a trigger >> >> is what I really want to do now. >> >> >> >> I am curious to know if someone has done similar job or there are >> >> features or APIs or best practices available for Accumulo so far. I'm >> >> thinking of letting the internal service which updates the data notify >> >> us whenever it updates the data. >> >> >> >> What do you think? >> >> >> >> Thanks, >> >> Thai >> >
