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From Michał Podsiadłowski <podsiadlow...@gmail.com>
Subject Cache in hbase for already persisted data and memory limits
Date Fri, 11 Dec 2009 13:39:26 GMT
Hi All,

again I have few questions about setting hbase on production. Now my
concerns are about memory requirements for dataNode and region server.  How
large should be the limits and what is ( if any ) the "rule of thumb" for
those estimates.

Second question is about hbase architecture - is there any cache for data
that have been already persisted to hdfs?
MemCache which can be found quite easily is only for data waiting to be
flushed to hdfs. If there isn't any in hbase layer are you aware of any in
hdfs layer? This is quite important questions since existence of such a
cache affects estimations for memory limits and performance.

Thanks,
Michael

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