Mehakmeet Singh created HADOOP-17158:
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Summary: Intermittent test timeout for
ITestAbfsInputStreamStatistics#testReadAheadCounters
Key: HADOOP-17158
URL: https://issues.apache.org/jira/browse/HADOOP-17158
Project: Hadoop Common
Issue Type: Bug
Components: fs/azure
Affects Versions: 3.3.0
Reporter: Mehakmeet Singh
Assignee: Mehakmeet Singh
Intermittent test timeout for
ITestAbfsInputStreamStatistics#testReadAheadCounters happening due to race
conditions in readAhead threads.
Test error:
{code:java}
[ERROR]
testReadAheadCounters(org.apache.hadoop.fs.azurebfs.ITestAbfsInputStreamStatistics)
Time elapsed: 30.723 s <<<
ERROR!org.junit.runners.model.TestTimedOutException: test timed out after 30000
milliseconds at java.lang.Thread.sleep(Native Method) at
org.apache.hadoop.fs.azurebfs.ITestAbfsInputStreamStatistics.testReadAheadCounters(ITestAbfsInputStreamStatistics.java:346)
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) {code}
Possible Reasoning:
- ReadAhead queue doesn't get completed and hence the counter values are not
satisfied in 30 seconds time for some systems.
- The condition that readAheadBytesRead and remoteBytesRead counter values need
to be greater than or equal to 4KB and 32KB respectively doesn't occur in some
machines due to the fact that sometimes instead of reading for readAhead
Buffer, remote reads are performed due to Threads still being in the readAhead
queue to fill that buffer. Thus resulting in either of the 2 counter values to
be not satisfying the condition and getting in an infinite loop and hence
timing out the test eventually.
Possible Fixes:
- Write better test(That would pass under all conditions).
- Maybe UT instead of IT?
Possible fix to better the test would be preferable and UT as the last resort.
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