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From Jonathan Gray <jg...@fb.com>
Subject RE: question about meta data query intensity
Date Tue, 23 Nov 2010 17:50:57 GMT
It is possible that it could be a bottleneck but usually is not.  Generally production HBase
installations have long-lived clients, so the client-side caching is sufficient to reduce
the amount of load to META (virtually 0 clean cluster is at steady-state / no region movement).

For MapReduce, you do make new clients but generally only need to query for one region per

It is not currently possible to split META.  We hard-coded some stuff a while back to make
things easier and in the name of correctness.

HBASE-3171 is about removing the ROOT region and putting the META region(s) locations into
ZK directly.  When we make that change, we could probably also re-enable the splitting of


> -----Original Message-----
> From: Jack Levin [mailto:magnito@gmail.com]
> Sent: Tuesday, November 23, 2010 9:31 AM
> To: user@hbase.apache.org
> Subject: question about meta data query intensity
> Hello, I am curious if there is a potential bottleneck in .META.
> ownership by a single region server.  Is it possible (safe) to split
> meta region into several?
> -Jack

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