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Posted to issues@hbase.apache.org by "Jonathan Hsieh (JIRA)" <ji...@apache.org> on 2011/08/31 19:40:09 UTC

[jira] [Created] (HBASE-4314) MemStoreFlusher lower bound should be allowed to be lower.

MemStoreFlusher lower bound should be allowed to be lower.
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                 Key: HBASE-4314
                 URL: https://issues.apache.org/jira/browse/HBASE-4314
             Project: HBase
          Issue Type: Improvement
            Reporter: Jonathan Hsieh



It might be nice to have the lower bound of a mem store set to a percentage or some set value such as Math.min(10% of heap, 100MB). 

As an example, for applications that only bulk load and just want a big read cache, it makes sense that you might have a 10GB heap and set this to 0.02 for 200MB, since memstores are basically unused. An app that writes rarely could be configured to such a low value such as 0.05.   (which is below the current .10 threshold)

Automatically changing back to the default limit (.35) could be nasty.

Maybe we should just warn, rather than silently changing config?


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