[HBASE-17204] Make Off heap Bucket Cache default ON

• Type: Improvement
• Status: Open
• Priority: Blocker
• Resolution: Unresolved
• Affects Version/s: 2.0.0
• Assignee: Anoop Sam John
• Reporter: Anoop Sam John
• Created: 30/Nov/16 10:07
• Updated: 01/Mar/18 20:32

Description

L2 cache can be used for data blocks. By default it is off now. After HBASE-11425 work, L2 off heap cache can equally perform with L1 on heap cache. On heavy loaded workload, this can even out perform L1 cache. Pls see recently published report by Alibaba. Also this work was backported by Rocketfuel and similar perf improvement report from them too.
Let us turn L2 off heap cache ON. As it is off heap, we can have much larger sized L2 BC. What should be the default size?

Issue Links

• is blocked by: HBASE-16630 Fragmentation in long running Bucket Cache
• is blocked by: HBASE-15240 Go Big BucketCache Fixes

Sub-Tasks

• Bucket cache no longer L2 for LRU cache: Resolved
• Doc cleanup after removal of features across Cache/BucketCache: Resolved
• Reduce default Block Cache size percentage: Open
• Turn ON off heap Bucket Cache by default: Patch Available