HADOOP-16385. Namenode crashes with 'RedundancyMonitor thread received Runtime exception'. Contributed by Ayush Saxena.
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@ -569,10 +569,11 @@ public class NetworkTopology {
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private Node chooseRandom(final InnerNode parentNode,
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final Node excludedScopeNode, final Collection<Node> excludedNodes,
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final int totalInScopeNodes, final int availableNodes) {
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Preconditions.checkArgument(
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totalInScopeNodes >= availableNodes && availableNodes > 0, String
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.format("%d should >= %d, and both should be positive.",
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totalInScopeNodes, availableNodes));
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if (totalInScopeNodes < availableNodes) {
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LOG.warn("Total Nodes in scope : {} are less than Available Nodes : {}",
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totalInScopeNodes, availableNodes);
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return null;
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}
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if (excludedNodes == null || excludedNodes.isEmpty()) {
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// if there are no excludedNodes, randomly choose a node
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final int index = r.nextInt(totalInScopeNodes);
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