Anoop Sam John commented on HBASE-17204:

Agree Stack. There are some jiras which must be fixed before doing this.  I 
will link whatever am coming across.. Pls link if any thing is missing.
There is also another issue of memory wastage by BC which is raised by 
[~dvdreddy]. That is also a blocker.

> 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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