[
https://issues.apache.org/jira/browse/HBASE-11323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14107881#comment-14107881
]
Hudson commented on HBASE-11323:
--------------------------------
SUCCESS: Integrated in HBase-0.94-security #514 (See
[https://builds.apache.org/job/HBase-0.94-security/514/])
HBASE-11323 Add MultiRowMutation tests. (Liu Shaohui) (larsh: rev
44492624d4b8a6cf1ce1c7ba595f3a3447f9f536)
*
src/test/java/org/apache/hadoop/hbase/coprocessor/TestMultiRowMutationProtocol.java
> BucketCache all the time!
> -------------------------
>
> Key: HBASE-11323
> URL: https://issues.apache.org/jira/browse/HBASE-11323
> Project: HBase
> Issue Type: Sub-task
> Components: io
> Reporter: stack
> Assignee: stack
> Fix For: 2.0.0
>
> Attachments:
> BlockCacheReportLruBlockCachevsOffHeapCombinedBlockCacheSmall4G (1).pdf,
> ReportBlockCache.pdf
>
>
> One way to realize the parent issue is to just enable bucket cache all the
> time; i.e. always have offheap enabled. Would have to do some work to make
> it drop-dead simple on initial setup (I think it doable).
> So, upside would be the offheap upsides (less GC, less likely to go away and
> never come back because of full GC when heap is large, etc.).
> Downside is higher latency. In Nick's BlockCache 101 there is little to no
> difference between onheap and offheap. In a basic compare doing scans and
> gets -- details to follow -- I have BucketCache deploy about 20% less ops
> than LRUBC when all incache and maybe 10% less ops when falling out of cache.
> I can't tell difference in means and 95th and 99th are roughly same (more
> stable with BucketCache). GC profile is much better with BucketCache -- way
> less. BucketCache uses about 7% more user CPU.
> More detail on comparison to follow.
> I think the numbers disagree enough we should probably do the [~lhofhansl]
> suggestion, that we allow you to have a table sit in LRUBC, something the
> current bucket cache layout does not do.
--
This message was sent by Atlassian JIRA
(v6.2#6252)
