Guangming Zhang created HDFS-12822:
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Summary: HDFS unit test failure in AArch64.
TestDirectoryScanner.testThrottling: Throttle is too permissive
Key: HDFS-12822
URL: https://issues.apache.org/jira/browse/HDFS-12822
Project: Hadoop HDFS
Issue Type: Test
Components: test
Affects Versions: 3.1.0
Environment: ARMv8 AArch64, Ubuntu16.04
Reporter: Guangming Zhang
Priority: Minor
Description: Hi, When I ran the HDFS unit test and got a failure in
TestDirectoryScanner.java test case :
TestDirectoryScanner.testThrottling:624 Throttle is too permissive
detail:
Running
org.apache.hadoop.hdfs.server.datanode.TestDirectoryScanner
Tests run: 7, Failures: 1, Errors: 0, Skipped: 0, Time elapsed:
227.046 sec <<< FAILURE! - in
org.apache.hadoop.hdfs.server.datanode.TestDirectoryScanner
testThrottling(org.apache.hadoop.hdfs.server.datanode.TestDirectoryScanner)
Time elapsed: 198.014 sec <<< FAILURE!
java.lang.AssertionError: Throttle is too permissive
at
org.junit.Assert.fail(Assert.java:88)
at
org.junit.Assert.assertTrue(Assert.java:41)
at
org.apache.hadoop.hdfs.server.datanode.TestDirectoryScanner.testThrottling(TestDirectoryScanner.java:624)
And below is the failure part of source code TestDirectoryScanner.java:
...........
while ((retries > 0) && ((ratio < 7f) || (ratio > 10f))) {
scanner = new DirectoryScanner(dataNode, fds, conf);
ratio = runThrottleTest(blocks);
retries -= 1;
}
// Waiting should be about 9x running.
LOG.info("RATIO: " + ratio);
assertTrue("Throttle is too restrictive", ratio <= 10f);
assertTrue("Throttle is too permissive", ratio >= 7f);
............
private float runThrottleTest(int blocks) throws IOException {
scanner.setRetainDiffs(true);
scan(blocks, 0, 0, 0, 0, 0);
scanner.shutdown();
assertFalse(scanner.getRunStatus());
return (float)scanner.timeWaitingMs.get() / scanner.timeRunningMs.get();
}
.............
The ratio in my test is 6.0578866, which is smaller than 7f in the code. So the
code thrown out an assertTrue failure.
My questions are:
1. Why the ratio was set between 7f and 10f, is it a empirical value?
2. The ratio is smaller than 7f in AArch64 platform, is this value
within normal range?
Could anyone help? Thanks a lot.
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