Yutong Xiao created HBASE-26681:
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Summary: Introduce a little RAMBuffer for bucketcache to reduce gc
and improve throughput
Key: HBASE-26681
URL: https://issues.apache.org/jira/browse/HBASE-26681
Project: HBase
Issue Type: Improvement
Components: BucketCache, Performance
Reporter: Yutong Xiao
Assignee: Yutong Xiao
Fix For: 1.7.2
In branch-1, BucketCache just allocate new onheap bytebuffer to construct new
HFileBlock when get cached blocks. This rough allocation increases the GC
pressure for those "hot" blocks.
Here introduce a RAMBuffer for those "hot" blocks in BucketCache. The thought
is simple. The RAMBuffer is an timeout expiring cache. When a Multi-level block
is read twice, we cache it in the RAMBuffer. When the block timeout in the
cache (e.g. 60s), that means the block is not being accessed in 60s, we evict
it. Not like LRU, we do not cache block when the whole RAMBuffer size reaches
to a threshold (to fit different workload, the threshold is dynamic). This will
prevent the RAMBuffer from being churned.
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