GitHub user 10110346 opened a pull request:

    https://github.com/apache/spark/pull/20596

    [SPARK-23404][CORE]When the underlying buffers are direct, we should copy 
them to the heap memory

    ## What changes were proposed in this pull request?
    If the memory mode is `ON_HEAP`,when the underlying buffers are direct, we 
should copy them to the heap memory.
    
    ## How was this patch tested?
    N/A


You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/10110346/spark directtooffheap

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/spark/pull/20596.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #20596
    
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commit 1f5d5ffbfe20c159fcf56d67ec230b05b06046a1
Author: liuxian <liu.xian3@...>
Date:   2018-02-13T07:36:08Z

    fix

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