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https://issues.apache.org/jira/browse/HBASE-8450?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13650278#comment-13650278
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Jean-Daniel Cryans commented on HBASE-8450:
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hbase-default.xml:
- hfile.block.cache.size=0.4: Since we let users dedicate up to 80% of the
heap for the block cache and Memstores, we should fully use that space by
default. I've stopped counting the numbers I've told people that they had all
this memory that's not being used because they were keeping the configs
default... Right now we're at 25/40 so I'd just bump up the block cache to 40.
Even better would be doing HBASE-5349...
- hbase.hregion.majorcompaction=0: disable major compactions, I can't remember
the last time I told someone to run them more often, but just last week I told
someone to either disable them or have them running weekly.
- hbase.regionserver.nbreservationblocks=0: do we even want this now that we
kill on OOME?
- hbase.regionserver.handler.count=50: or it could be 100, I don't really have
data on this.
- hbase.client.pause=100: make everything snappier? might want to bump up the
number of retries. I don't have data on this.
- hbase.rpc.timeout=10000: snappier I said!
- hbase.hstore.compactionThreshold=5: we now have a better compaction
algorithm, maybe it's worth keeping more files around and be more efficient
about the whole process?
- hbase.hstore.blockingStoreFiles=10: I'd give some room to the algo to make
good choices so bumping that up too.
- zookeeper.session.timeout=90000: is 3 minutes still a good default? Now that
we have MSLAB it's rare that I see legit GC issues.
Other:
- Enable bloom filters by default, will also help offsetting the higher number
of files.
- Set the default heap higher? 2GB?
> Update hbase-default.xml and general recommendations to better suit current
> hw, h2, experience, etc.
> ----------------------------------------------------------------------------------------------------
>
> Key: HBASE-8450
> URL: https://issues.apache.org/jira/browse/HBASE-8450
> Project: HBase
> Issue Type: Task
> Components: Usability
> Reporter: stack
> Priority: Critical
> Fix For: 0.95.1
>
> Attachments: 8450.txt
>
>
> This is a critical task we need to do before we release; review our defaults.
> On cursory review, there are configs in hbase-default.xml that no longer have
> matching code; there are some that should be changed because we know better
> now and others that should be amended because hardware and deploys are bigger
> than they used to be.
> We could also move stuff around so that the must-edit stuff is near the top
> (zk quorum config. is mid-way down the page) and beef up the descriptions --
> especially since these descriptions shine through in the refguide.
> Lastly, I notice that our tgz does not "include" an hbase-default.xml other
> than the one bundled up in the jar. Maybe we should make it more accessible.
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