[jira] [Closed] (FLINK-26705) use threadlocal to decrease ObjectSizeCalculator memory use

["hd zhou (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-26705?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

hd zhou closed FLINK-26705.
---------------------------
    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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