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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-19148) Reevaluate default values of configurations
Date Sat, 16 Dec 2017 01:53:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-19148?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16293552#comment-16293552
] 

stack commented on HBASE-19148:
-------------------------------

[~davelatham] some questions sir

I think 'hbase.master.loadbalance.bytable=true' makes sense as default on big cluster where
tables are big, less so on small cluster (i think). Looking at the stochastic balancer, it
has this in the class comment:

 * <p>This balancer is best used with hbase.master.loadbalance.bytable set to false
 * so that the balancer gets the full picture of all loads on the cluster.</p>

Let me add this config to hbase-default so folks see at least it is there.

hbase.regionserver.fileSplitTimeout=30000 in branch-2. This better?

bq. hbase.regionserver.logroll.multiplier=0.5 - With the default of 0.95, whenever write load
was significant, we saw many log files that had a little bit more than 1 HDFS block worth
of data. Seemed a waste.

So, we'd run over the block size because 0.95 doesn't give us enough wiggly room within which
to close the WAL? We could come down from 0.95. 0.5 seems way down. We'd make lots of files
-- a pain in itself.  Set it at  0.8?  Should we up the default block size?




> Reevaluate default values of configurations
> -------------------------------------------
>
>                 Key: HBASE-19148
>                 URL: https://issues.apache.org/jira/browse/HBASE-19148
>             Project: HBase
>          Issue Type: Bug
>          Components: defaults
>            Reporter: stack
>            Assignee: stack
>            Priority: Blocker
>             Fix For: 2.0.0-beta-1
>
>         Attachments: HBASE-19148.master.001.patch
>
>
> Remove cruft and mythologies. Make descriptions more digestible. Change defaults given
experience.



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