LiXin Ge created HDDS-449:
-----------------------------
Summary: Add a NULL check to protect DeadNodeHandler#onMessage
Key: HDDS-449
URL: https://issues.apache.org/jira/browse/HDDS-449
Project: Hadoop Distributed Data Store
Issue Type: Improvement
Reporter: LiXin Ge
Assignee: LiXin Ge
Add a NULL check to protect the situation below(may only happened in the case
of unit test):
1.A new datanode register to SCM.
2. There is no container allocated in the new datanode temporarily.
3.The new datanode dead and an event was fired to {{DeadNodeHandler}}
4.In function {{DeadNodeHandler#onMessage}}, there will get nothing in
{{node2ContainerMap}} and {{containers}} will be {{NULL}}
5.NullPointerException will be throwen in the following iterate of
{{containers}} like:
{noformat}
[ERROR] Tests run: 2, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.535 s
<<< FAILURE! - in org.apache.hadoop.hdds.scm.node.TestDeadNodeHandler
[ERROR]
testStatisticsUpdate(org.apache.hadoop.hdds.scm.node.TestDeadNodeHandler) Time
elapsed: 0.33 s <<< ERROR!
java.lang.NullPointerException
at
org.apache.hadoop.hdds.scm.node.DeadNodeHandler.onMessage(DeadNodeHandler.java:68)
at
org.apache.hadoop.hdds.scm.node.TestDeadNodeHandler.testStatisticsUpdate(TestDeadNodeHandler.java:179)
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)
{noformat}
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