[jira] [Commented] (FLINK-13985) Use native memory for managed memory.

["Stephan Ewen (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-13985?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16927357#comment-16927357 ] 

Stephan Ewen commented on FLINK-13985:
--------------------------------------

Can you share some details about the exact mechanics?

In particular I would suggest to pay attention to the following aspects:
  - Add {{long allocate()}} and {{void release(long)}} to a core util, like {{MemoryUtils}} to abstract over Unsafe, so that it is easier to deal with the Unsafe removal later
  - Release the memory in the {{free()}} method of the memory segments.
  - Add a safety net that frees the memory segments upon garbage collection. Have a look at how the DirectByteBuffer does it with the cleaners and reference queues.

> Use native memory for managed memory.
> -------------------------------------
>
>                 Key: FLINK-13985
>                 URL: https://issues.apache.org/jira/browse/FLINK-13985
>             Project: Flink
>          Issue Type: Sub-task
>            Reporter: Xintong Song
>            Assignee: Andrey Zagrebin
>            Priority: Major
>
> * Allocate memory with {{Unsafe.allocateMemory}}
>  ** {{MemoryManager}}
> Implement this issue in common code paths for the legacy / new mode. This should only affect the GC behavior.



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