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https://issues.apache.org/jira/browse/FLINK-26705?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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hd zhou closed FLINK-26705.
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Resolution: Abandoned
> use threadlocal to decrease ObjectSizeCalculator memory use
> -----------------------------------------------------------
>
> Key: FLINK-26705
> URL: https://issues.apache.org/jira/browse/FLINK-26705
> Project: Flink
> Issue Type: Improvement
> Reporter: hd zhou
> Priority: Major
>
> in class ObjectSizeCalculator
> everytime call static function getObjectSize will new ObjectSizeCalculator,
> cost much memory, Gc busy. use threadlocal will decrease memory use
>
> {code:java}
> /**
> * Given an object, returns the total allocated size, in bytes, of the object
> and all other objects reachable from it.
> * Attempts to to detect the current JVM memory layout, but may fail with
> {@link UnsupportedOperationException};
> *
> * @param obj the object; can be null. Passing in a {@link java.lang.Class}
> object doesn't do anything special, it
> * measures the size of all objects reachable through it (which will
> include its class loader, and by
> * extension, all other Class objects loaded by the same loader, and
> all the parent class loaders). It doesn't
> * provide the size of the static fields in the JVM class that the
> Class object represents.
> * @return the total allocated size of the object and all other objects it
> retains.
> * @throws UnsupportedOperationException if the current vm memory layout
> cannot be detected.
> */
> public static long getObjectSize(Object obj) throws
> UnsupportedOperationException {
> return obj == null ? 0 : new
> ObjectSizeCalculator(CurrentLayout.SPEC).calculateObjectSize(obj);
> } {code}
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