Elek, Marton created HDDS-1709:
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Summary: TestScmSafeNode is flaky
Key: HDDS-1709
URL: https://issues.apache.org/jira/browse/HDDS-1709
Project: Hadoop Distributed Data Store
Issue Type: Bug
Components: SCM, test
Reporter: Elek, Marton
Assignee: Elek, Marton
org.apache.hadoop.ozone.om.TestScmSafeMode.testSCMSafeMode is failed at last
night with the following error:
{code:java}
java.lang.AssertionError at org.junit.Assert.fail(Assert.java:86) at
org.junit.Assert.assertTrue(Assert.java:41) at
org.junit.Assert.assertTrue(Assert.java:52) at
org.apache.hadoop.ozone.om.TestScmSafeMode.testSCMSafeMode(TestScmSafeMode.java:285)
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$1.runReflectiveCall(FrameworkMethod.java:47)
at
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at
org.junit.internal.runners.statements.FailOnTimeout$StatementThread.run(FailOnTimeout.java:74){code}
Locally it can be tested but it's very easy to reproduce by adding an
additional sleep DataNodeSafeModeRule:
{code:java}
+++
b/hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/safemode/DataNodeSafeModeRule.java
@@ -63,7 +63,11 @@ protected boolean validate() {
@Override
protected void process(NodeRegistrationContainerReport reportsProto) {
-
+ try {
+ Thread.sleep(3000);
+ } catch (InterruptedException e) {
+ e.printStackTrace();
+ }{code}
This is a clear race condition:
DatanodeSafeModeRule and ContainerSafeModeRule are processing the same events
but it can be possible (in case of an accidental sleep) that the container safe
mode rule is done, but DatanodeSafeModeRule didn't process the new event (yet).
As a result the test execution will continue:
{code:java}
GenericTestUtils
.waitFor(() -> scm.getCurrentContainerThreshold() == 1.0, 100, 20000);
{code}
(This line is waiting ONLY for the ContainerSafeModeRule).
The fix is easy, let's wait for the processing of all the async events:
{code:java}
EventQueue eventQueue =
(EventQueue) cluster.getStorageContainerManager().getEventQueue();
eventQueue.processAll(5000L);{code}
As we are sure that the events are already sent to the EventQueue (because we
have the previous waitFor), it should be enough.
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