[HDFS-15308] TestReconstructStripedFile#testNNSendsErasureCodingTasks fails intermittently

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.3.0
• Fix Version/s: 3.4.0
• Component/s: erasure-coding
• Labels: flaky-test
• Hadoop Flags: Reviewed
• Assignee: Hemanth Boyina
• Reporter: Toshihiko Uchida
• Created: 29/Apr/20 10:00
• Updated: 05/Feb/21 15:25
• Resolved: 21/Dec/20 20:48

Description

In HDFS-14353, TestReconstructStripedFile.testNNSendsErasureCodingTasks failed once due to pending reconstruction timeout as follows.

java.lang.AssertionError: Found 4 timeout pending reconstruction tasks
	at org.junit.Assert.fail(Assert.java:88)
	at org.junit.Assert.assertTrue(Assert.java:41)
	at org.apache.hadoop.hdfs.TestReconstructStripedFile.testNNSendsErasureCodingTasks(TestReconstructStripedFile.java:502)
	at org.apache.hadoop.hdfs.TestReconstructStripedFile.testNNSendsErasureCodingTasks(TestReconstructStripedFile.java:458)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:298)
	at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:292)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.lang.Thread.run(Thread.java:748)

The error occurred on the following assertion.

// Make sure that all pending reconstruction tasks can be processed.
while (ns.getPendingReconstructionBlocks() > 0) {
  long timeoutPending = ns.getNumTimedOutPendingReconstructions();
  assertTrue(String.format("Found %d timeout pending reconstruction tasks",
      timeoutPending), timeoutPending == 0);
  Thread.sleep(1000);
}

The failure could not be reproduced in the reporter's docker environment (start-build-environment.sh).

Issue Links

• is duplicated by: HDFS-15656 TestReconstructStripedFile.testNNSendsErasureCodingTasks fails occasionally
• is related to: HDFS-15643 EC: Fix checksum computation in case of native encoders