Why would you expect to have a region allocated to all of the region servers? You generate a region based on either pre-splitting (you set the region’s key range) , or you start with one region and grow from there.
Please read either Lars George’s book (dated) or Nick Dimiduk’s book. (Sorry but has Lars George ever done a second or third edition yet? ) > On May 11, 2015, at 5:38 PM, Arun Patel <arunp.bigd...@gmail.com> wrote: > > I have some basic questions on regions. > > 1) I have a 10 node HBase cluster. When I create a table in HBase, how > many regions will be allocated by default? I looked at the HBase Master UI > and it seems regions are not allocated to all the Regionservers by > default. How can I allocate the regions in all Region Servers? Basically, > This distributes the data in a better way If I am using a slated key. My > requirement is to distribute the data across the cluster using salted > keys. But, Having few regions is a constraint? > > 2) How does the rowkey to region mapping works? In Cassandra, we have a > concept of assigning token range for each node. Rowkey will be assigned to > a node based on the token range. How does this work in HBase? > > Regards, > Arun The opinions expressed here are mine, while they may reflect a cognitive thought, that is purely accidental. Use at your own risk. Michael Segel michael_segel (AT) hotmail.com
