[jira] [Commented] (HBASE-20281) [DOC] upgrade section needs an explanation of changes to Bucket Cache

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    [ https://issues.apache.org/jira/browse/HBASE-20281?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16460280#comment-16460280 ] 

stack commented on HBASE-20281:
-------------------------------

[~anoop.hbase] So hbase.bucketcache.combinedcache.enabled is removed? It is still referenced in the architecture.adoc chapter. Should it be removed. This option is gone now? Is there a sentence I could us on why?

Is there a sentence on why 'heap' is no longer supported in hbase.bucketcache.ioengine  

If you dump the sentences in here, I'll fix up the doc sir.


> [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: 3.0.0, 2.1.0
>
>
> 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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