[HBASE-14793] Allow limiting size of block into L1 block cache. - ASF JIRA

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Very large blocks can fragment the heap and cause bad issues for the garbage collector, especially the G1GC. Now there is a maximum size that a block can be and still stick in the LruBlockCache. That size defaults to 16mb but can be controlled by changing "hbase.lru.max.block.size"

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Very large blocks can fragment the heap and cause bad issues for the garbage collector, especially the G1GC. Now there is a maximum size that a block can be and still stick in the LruBlockCache. That size defaults to 16mb but can be controlled by changing "hbase.lru.max.block.size"

G1GC does really badly with long lived large objects. Lets allow limiting the size of a block that can be kept in the block cache.

breaks

HBASE-16300 LruBlockCache.CACHE_FIXED_OVERHEAD should calculate LruBlockCache size correctly