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From Linlin Du <linlindu2...@hotmail.com>
Subject block cache size questions
Date Mon, 17 Mar 2014 13:01:07 GMT
Hi all,

First question:
According to documentation, hfile.block.cache.size is by default 40 percentage of maximum
heap (-Xmx setting). If -Xmx is not used and only -Xms is used, what will it be in this case?

Second question:
This 40% heap space is shared by all entities (stores). How much block cache is used by each
store (entity)? Is it allocated on demand? If a region has never been read after the region
server is up, will block cache be allocated for it?

Third question:
Is it possible to tell from .META when a region was last read? If so, how?

Many thanks,


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