Extend TestHeapSize and ClassSize to do "deep" sizing of Objects
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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
Fix For: 0.20.0
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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