Good question @Sumit Nigam. I think there is no sync between the HMaster and the slider AppMaster w.r.t the regionserver's expiry, and you could run into the situation you described. This would be a good thing to think about... @Ram Venkatesh
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nasghar@hortonworks.com when you say "based on certain query" what does that mean? Are you thinking of this -> ingest data in Phoenix/hbase, then ETL it out to ORC, for running deep analytics?
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The final #regions depends on the data at hand... If you want to constrain the number of regions, you should create a table with that many (pre-split) regions, and then import into that.
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