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From "Jens Deppe (JIRA)" <j...@apache.org>
Subject [jira] [Created] (GEODE-751) RegionMXBean shouldn't rely on Eviction Algorithm for getEntrySize
Date Thu, 07 Jan 2016 20:51:39 GMT
Jens Deppe created GEODE-751:
--------------------------------

             Summary: RegionMXBean shouldn't rely on Eviction Algorithm for getEntrySize
                 Key: GEODE-751
                 URL: https://issues.apache.org/jira/browse/GEODE-751
             Project: Geode
          Issue Type: Improvement
          Components: management
            Reporter: Jens Deppe


We have the following in the javadoc for method {{getEntrySize}} on interface {{RegionMXBean}}:
{quote}
Returns the aggregate entry size (in bytes) of all entries. This will provide a correct value
only if the eviction algorithm has been set to {{EvictionAlgorithm.LRU_MEMORY}}. For all partition
regions it will show entry size in bytes. It will also include size of all the secondary entries
in the data store. So while referring to size one should take redundancy into account.
{quote}
The region memory consumption and the eviction algorithm are two separate concepts, we should
not obligate customers to use a custom eviction algorithm to report the correct memory consumption
for a region. 

We rely on this attribute to show information on PULSE, so neither the member memory usage
nor cluster memory usage are accurate if the eviction algorithm is not configured as {{EvictionAlgorithm.LRU_MEMORY}}.


To reproduce, start up a cluster with a simple replicated region and insert some data. You
can check afterwards (from JConsole) that the attribute "EntrySize" for the replicated region
is set as "-1".

We rely on this attribute to show information on PULSE, so neither the member memory usage
nor cluster memory usage are accurate if the eviction algorithm is not configured as {{EvictionAlgorithm.LRU_MEMORY}}.




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