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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HBASE-2056) Wiser configurations
Date Tue, 07 May 2013 22:43:15 GMT

     [ https://issues.apache.org/jira/browse/HBASE-2056?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jean-Daniel Cryans resolved HBASE-2056.
---------------------------------------

    Resolution: Duplicate

Kind of invalid since so old, kind of a duplicate of HBASE-8450.
                
> Wiser configurations
> --------------------
>
>                 Key: HBASE-2056
>                 URL: https://issues.apache.org/jira/browse/HBASE-2056
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 0.20.2
>            Reporter: Jean-Daniel Cryans
>            Priority: Minor
>              Labels: moved_from_0_20_5
>
> Some of our default configurations do badly on machines that are provided with more CPUs
and RAM. For example:
> hbase.regionserver.global.memstore.upperLimit=0.4
> hbase.regionserver.global.memstore.lowerLimit=0.25
> That's good if you have 1GB heap, you just flush 250MB. On a 4GB heap, upper=1.6 and
lower=.9 so you have to flush 700MB which is blocking a lot. In this case you could use a
lot more than 40% of available heap and the lower limit should still be something like 250MB.
> hbase.master.meta.thread.rescanfrequency should adapt itself to the number of rows, small
clusters would boot faster by default and bigger clusters would scan it using the current
value (1 min).
> hbase.regionserver.lease.period should adapt itself if clients are always reporting after
some seconds. For example if it often reports after 30-40 seconds then we should temporarily
set the default higher than 60 seconds. An average on some sampling could help.
> hbase.regions.percheckin set it higher if average load will be big? Like on the first
scan on .META., you take the number of RS and check the average load to set this value.
> hbase.hstore.blockingStoreFiles higher if more heap available when we boot?

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