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Published 20 hours ago • verified publisher icon apache

HADOOP-18429. fix infinite loop in MutableGaugeFloat#incr(float)

Open asdfgh19 opened this issue 2 years ago • 5 comments

Description of PR

JIRA - HADOOP-18429 The Unit Test get stuck in an infinite loop

public void testMutableGaugeFloat() {
    MutableGaugeFloat mgf = new MutableGaugeFloat(Context,3.2f);
    assertEquals(3.2f, mgf.value(), 0.0);
    mgf.incr();
    assertEquals(4.2f, mgf.value(), 0.0);
  }

The current implementation converts the value from int to float, causing the compareAndSet method to get stuck.

private final boolean compareAndSet(float expect, float update) {
  return value.compareAndSet(Float.floatToIntBits(expect),
      Float.floatToIntBits(update));
}

private void incr(float delta) {
  while (true) {
    float current = value.get();
    float next = current + delta;
    if (compareAndSet(current, next)) {
      setChanged();
      return;
    }
  }
}

Perhaps it could be:

private void incr(float delta) {
  while (true) {
    float current = Float.intBitsToFloat(value.get());
    float next = current + delta;
    if (compareAndSet(current, next)) {
      setChanged();
      return;
    }
  }
}

How was this patch tested?

unit test in TestMutableMetrics#testMutableGaugeFloat()

asdfgh19 avatar Aug 29 '22 11:08 asdfgh19

:broken_heart: -1 overall

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hadoop-yetus avatar Aug 29 '22 15:08 hadoop-yetus

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hadoop-yetus avatar Aug 30 '22 06:08 hadoop-yetus

:confetti_ball: +1 overall

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hadoop-yetus avatar Aug 30 '22 17:08 hadoop-yetus

:broken_heart: -1 overall

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GITHUB PR https://github.com/apache/hadoop/pull/4823
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hadoop-yetus avatar Sep 16 '22 06:09 hadoop-yetus

:confetti_ball: +1 overall

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hadoop-yetus avatar Oct 03 '22 10:10 hadoop-yetus

@ZanderXu @ashutoshcipher Thanks for helping to review the code. Can you help merge this pr into trunk branch?

asdfgh19 avatar Oct 14 '22 05:10 asdfgh19

@ZanderXu, This PR looks good. Can you see if you can commit this?

Thanks.

ashutoshcipher avatar Nov 16 '22 09:11 ashutoshcipher

Merged. Thanks @huxinqiu for your report and thanks @ashutoshcipher for your review. Thanks so much.

ZanderXu avatar Nov 17 '22 09:11 ZanderXu