[jira] [Created] (OAK-5117) Improve checkMemory for compaction

["Valentin Olteanu (JIRA)" <ji...@apache.org>]

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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