To prevent possible overrun of block cache with CacheOnWrite, add safeguard so
we reject blocks if completely full
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Key: HBASE-3302
URL: https://issues.apache.org/jira/browse/HBASE-3302
Project: HBase
Issue Type: Improvement
Components: io, regionserver
Reporter: Jonathan Gray
Assignee: Jonathan Gray
Fix For: 0.92.0
With the aggressive caching when CacheOnWrite is turned on, and given the
current LRU architecture, there's potential (though low probability) we could
overrun the block cache capacity by caching faster than we can evict.
Currently the block cache triggers eviction at 85% capacity. If somehow we
attempt to cache a block but the cache is at 100% capacity, we should reject
caching of that block.
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