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https://issues.apache.org/jira/browse/HBASE-17204?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16286518#comment-16286518
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Zach York commented on HBASE-17204:
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[~stack] [~anoop.hbase] [~ram_krish]
Sorry I'm late to the party here, but I stumbled across this late.
So if I'm reading this correctly, there will by default be no L1 in memory
cache if you specify bucketcache? This will be a problem for our distribution
as we still rely on quick lookup of the L1 cache (in memory) for indexes, bloom
filters, etc, but rely on the file based IO engine for caching data blocks.
This could be a blocker for us moving to HBase 2.0.
However, I don't generally disagree with the approach. Perhaps HBASE-18300
should be higher priority now to allow users to still use off-head and file
based BucketCaches concurrently.
> Make Off heap Bucket 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
> Priority: Blocker
> Fix For: 2.0.0-beta-1
>
>
> 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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