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Posted to dev@phoenix.apache.org by "Nick Dimiduk (JIRA)" <ji...@apache.org> on 2016/05/26 01:16:13 UTC

[jira] [Created] (PHOENIX-2939) MetaCache is easily thrashed with default settings

Nick Dimiduk created PHOENIX-2939:
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             Summary: MetaCache is easily thrashed with default settings
                 Key: PHOENIX-2939
                 URL: https://issues.apache.org/jira/browse/PHOENIX-2939
             Project: Phoenix
          Issue Type: Bug
            Reporter: Nick Dimiduk


With default settings for {{phoenix.coprocessor.maxMetaDataCacheSize}} (20mb) and {{phoenix.stats.guidepost.width}} (100mb * 3), even a relatively small amount of data (ie 10TB, 2000 regions) will easily produce more stats data than fits in the cache. This quickly leads us into a situation where we thrash the cache and spend an inordinate amount of time (re)scanning SYSTEM.STATS table.



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