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From WangYQ <wangyongqiang0...@163.com>
Subject on blockCache hitRatio
Date Thu, 16 Jun 2016 05:41:02 GMT
HBASE_HEAP_SIZE=10G, use LruBlockCache with 0.4 of HBASE_HEAP_SIZE
after hbase run 15 days , in find in some RS, there are 200M free block cache, but hit ration
is 10%, too low 


i think the hit ration is low may be bacause of small block cache size(4G)


is there any suggestions to get a higher hit ration?


does use offheap-bucket cache can have effect? in hbase doc, i see bucket cache is mainly
used to descraese CMS by GC
and when we use combined cache(LRUBlokcCache+bucketCache), meta data is stored in lru, data
is stored on offheap-bucketCache, does not has effect on read performance?
is there any test data?

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