Valentin Olteanu created OAK-5117:
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Summary: Improve checkMemory for compaction
Key: OAK-5117
URL: https://issues.apache.org/jira/browse/OAK-5117
Project: Jackrabbit Oak
Issue Type: Improvement
Components: segment-tar
Reporter: Valentin Olteanu
The check introduced in OAK-4966 is relying on the first {{MemoryPoolMXBean}}
found that matches the criteria. This means that, depending on the JVM, it will
be checking any of the: PS Eden Space, PS Survivor Space or PS Old Gen Space -
whichever is found first.
I am proposing a more reliable way to check this:
1. check the biggest pool - this usually corresponds to PS Old Gen (by default
2/3 of the heap), which is more stable and reflects better the usage of the
heap.
2. use {{getCollectionUsage()}} instead of {{getUsage()}} to check the state of
the heap after a GC. This way we avoid checking during temporary peaks of the
used heap.
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