Memory-aware Maps with LRU eviction
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Key: HBASE-1186
URL: https://issues.apache.org/jira/browse/HBASE-1186
Project: Hadoop HBase
Issue Type: New Feature
Reporter: Jonathan Gray
Priority: Critical
Fix For: 0.20.0
Caching is key for 0.20. We need a set of memory-aware data structures to
manage our caches.
I propose two initial classes: LruHashMap and LruBlockMap
*LruHashMap* is currently being used over in HBASE-80 for the Cell cache. Erik
Holstad has done extensive testing and benchmarking and will post results over
in this issue.
- Memory-aware
- Fixed size
- LRU eviction
*LruBlockMap* can be used for the block caching of the new file format in
HBASE-61. It should try to use all available memory, but must contend with
Memcaches so is resizable to deal with heap pressure. Adding high priority
blocks (evicted last) gives us in-memory functionality as described in bigtable
paper.
- Memory-aware
- Fully resizable
- LRU eviction (with some additions)
- High priority blocks
- _Optional: Scan resistant algorithm_
Part of this issue is also solving how we will determine the size of cached
objects.
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