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HBase >> mail # user >> HBase coprocessor callback for comet

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HBase coprocessor callback for comet

I would like to feed a servlet that is serving a long polling request with
notifications when certain rows in an hbase table change.

It seems that the best mechanism to achieve this would be to add a custom
RegionObserver. What I'm unsure about though is how to best issue the
callback. Does hbase provide an RPC mechanism that I could re-use or should
I consider this a separate problem entirely? Are there alternative ways to
get notified of row changes that better handle this problem?