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https://issues.apache.org/jira/browse/HBASE-17204?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15709232#comment-15709232
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stack commented on HBASE-17204:
-------------------------------
We can come out w/ new defaults for 2.0 (with refguide appropriately updated).
+1 on enabling by default.
We need to do a bit of work though first.
We need to decide on a new config., direct memory size in MB/G. The L2 is some
proportion of this.
If L2, then L1 should be shrunk.
If L2, then heap should be smaller?
Do we need a 'configure' that spits out basic templates for hbase-env.sh? Or a
file sourced by hbase-env.sh that has in it heap, offheap, sizings set?
Then there is the L2 BucketCache itself. It needs a bit of work. HBASE-15240
has some outstanding items (Let me add a few more I have from working notes
kept around last time I messed w/ bucketcache).
> Make L2 off heap cache default ON
> ---------------------------------
>
> Key: HBASE-17204
> URL: https://issues.apache.org/jira/browse/HBASE-17204
> Project: HBase
> Issue Type: Improvement
> Affects Versions: 2.0.0
> Reporter: Anoop Sam John
> Assignee: Anoop Sam John
> Fix For: 2.0.0
>
>
> 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?
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