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From Lin Ma <lin...@gmail.com>
Subject client cache for all region server information?
Date Thu, 23 Aug 2012 06:30:50 GMT
Hello HBase masters,

I am wondering whether in current implementation, each client of HBase
cache all information of region server, for example, where is region server
(physical hosting machine of region server), and also cache row-key range
managed by the region server. If so, two more questions,

- will there be too much overhead (e.g. memory footprint) of each client?
- when such information is downloaded and cached at client side, and when
the information is refreshed (does it only triggered by region server
change and failure to fetch such information from client -- e.g. when
client use cache to access machine A for region B, but find nothing, so the
client needs to refresh the information in cache to see which machine owns
region B)?

regards,
Lin

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