HDDS-1331. In DatanodeStateMachine join check for not null.
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@ -363,8 +363,13 @@ public class DatanodeStateMachine implements Closeable {
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* @throws InterruptedException
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*/
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public void join() throws InterruptedException {
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stateMachineThread.join();
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cmdProcessThread.join();
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if (stateMachineThread != null) {
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stateMachineThread.join();
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}
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if (cmdProcessThread != null) {
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cmdProcessThread.join();
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}
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}
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/**
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