Simpler implementation for slab cache
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Key: HBASE-4569
URL: https://issues.apache.org/jira/browse/HBASE-4569
Project: HBase
Issue Type: Improvement
Components: regionserver
Affects Versions: 0.92.0
Reporter: Todd Lipcon
Attachments: hbase-4569.txt
I spent a little bit of time last night hacking on the slab cache
implementation to make it a little simpler. The change is:
- no longer has the composition of SlabCache containing a SingleSizeCache per
slab size. SlabCache holds its own slabs
- no longer use guava's map implementations to handle a size-bounded cache.
Instead, manages its own LRU linked list
- significantly less clever about synchronization. since this is an L2 cache,
it should be less contended than the L1 cache, and I think we can afford to be
dumb.
- should have less memory usage since there's only one map entry per key
instead of several.
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