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https://issues.apache.org/jira/browse/HBASE-20281?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16445362#comment-16445362
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Anoop Sam John commented on HBASE-20281:
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hbase.bucketcache.ioengine changes are there. That we have removed onheap
mode and also new modes like files and mmap.
hbase.bucketcache.combinedcache.enabled - I can see this is added under
section "Configuration settings no longer in HBase 2.0+" already.
> [DOC] upgrade section needs an explanation of changes to Bucket Cache
> ---------------------------------------------------------------------
>
> Key: HBASE-20281
> URL: https://issues.apache.org/jira/browse/HBASE-20281
> Project: HBase
> Issue Type: Sub-task
> Components: BucketCache, documentation
> Affects Versions: 2.0.0
> Reporter: Sean Busbey
> Priority: Critical
> Fix For: 2.0.0
>
>
> the first pass version of the upgrade docs has a brief note about the bucket
> cache changing:
> {quote}
> * hbase.bucketcache.combinedcache.enabled <!-- This seems worth a call out
> section? -->
> * hbase.bucketcache.ioengine no longer supports the 'heap' value. <!-- This
> seems worth a call out section? -->
> {quote}
> But the changes are substantial and warrant a section of their own under the
> "Changes of Note!" banner.
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