Concurrent LRU Block Cache
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Key: HBASE-1460
URL: https://issues.apache.org/jira/browse/HBASE-1460
Project: Hadoop HBase
Issue Type: Improvement
Components: io
Reporter: Jonathan Gray
Fix For: 0.20.0
The LRU-based block cache that will be committed in HBASE-1192 is thread-safe
but contains a big lock on the hash map. Under high load, the block cache will
be hit very heavily from a number of threads, so it needs to be built to handle
massive concurrency.
This issue aims to implement a new block cache with LRU eviction, but backed by
a ConcurrentHashMap and a separate eviction thread. Influence will be drawn
from Solr's ConcurrentLRUCache, however there are major differences because
solr treats all cached elements as equal size whereas we are dependent on our
HeapSize interface with realistic (though approximate) heap usage.
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