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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Reopened: (HBASE-1590) Extend TestHeapSize and ClassSize to do "deep" sizing of Objects
Date Wed, 12 Aug 2009 23:40:14 GMT

     [ https://issues.apache.org/jira/browse/HBASE-1590?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

stack reopened HBASE-1590:
--------------------------


Mind if I keep this open JG?  I think it'd be sweet integrating the sizeof  jar fetching it
if user asks for it.  Maybe when we move build to ivy it wouldn't be too hard.

> Extend TestHeapSize and ClassSize to do "deep" sizing of Objects
> ----------------------------------------------------------------
>
>                 Key: HBASE-1590
>                 URL: https://issues.apache.org/jira/browse/HBASE-1590
>             Project: Hadoop HBase
>          Issue Type: Improvement
>    Affects Versions: 0.20.0
>            Reporter: Jonathan Gray
>            Assignee: Jonathan Gray
>             Fix For: 0.21.0
>
>
> As discussed in HBASE-1554 there is a bit of a disconnect between how ClassSize calculates
the heap size and how we need to calculate heap size in our implementations.
> For example, the LRU block cache can be sized via ClassSize, but it is a shallow sizing.
 There is a backing ConcurrentHashMap that is the largest memory consumer.  However, ClassSize
only counts that as a single reference.  But in our heapSize() reporting, we want to include
*everything* within that Object.
> This issue is to resolve that dissonance.  We may need to create an additional ClassSize.estimateDeep(),
we may need to rethink our HeapSize interface, or maybe just leave it as is.  The two primary
goals of all this testing is to 1) ensure that if something is changed and the sizing is not
updated, our tests fail, and 2) ensure our sizing is as accurate as possible.

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