object SizeEstimator extends Logging
:: DeveloperApi :: Estimates the sizes of Java objects (number of bytes of memory they occupy), for use in memory-aware caches.
Based on the following JavaWorld article: https://www.infoworld.com/article/2077408/sizeof-for-java.html
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- @DeveloperApi()
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- SizeEstimator.scala
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- def estimate(obj: AnyRef): Long
Estimate the number of bytes that the given object takes up on the JVM heap.
Estimate the number of bytes that the given object takes up on the JVM heap. The estimate includes space taken up by objects referenced by the given object, their references, and so on and so forth.
This is useful for determining the amount of heap space a broadcast variable will occupy on each executor or the amount of space each object will take when caching objects in deserialized form. This is not the same as the serialized size of the object, which will typically be much smaller.
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- Deprecated
(Since version 9)