[GitHub] spark pull request #19854: [SPARK-22660][BUILD] Use position() and limit() t...

[kellyzly <gi...@git.apache.org>]

Github user kellyzly commented on a diff in the pull request:

    https://github.com/apache/spark/pull/19854#discussion_r155168946
  
    --- Diff: common/unsafe/src/main/java/org/apache/spark/unsafe/Platform.java ---
    @@ -169,8 +169,10 @@ public static ByteBuffer allocateDirectBuffer(int size) {
           cleanerField.setAccessible(true);
           long memory = allocateMemory(size);
           ByteBuffer buffer = (ByteBuffer) constructor.newInstance(memory, size);
    -      Cleaner cleaner = Cleaner.create(buffer, () -> freeMemory(memory));
    -      cleanerField.set(buffer, cleaner);
    +//    sun.misc.Cleaner is not used in JDK9(see SPARK-22659), we can use CleanUtil in HADOOP-12760 to solve it
    +//    Cleaner cleaner = Cleaner.create(buffer, () -> freeMemory(memory));
    +//    cleanerField.set(buffer, cleaner);
    --- End diff --
    
    @srowen ： have deleted changes about Platform.java. So current pr is only for solving problems met in scala-2.12 and can not fix the problem about JDK9.


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