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HADOOP-16385. Namenode crashes with 'RedundancyMonitor thread received Runtime exception'. Contributed by Ayush Saxena. 

(cherry picked from commit aa9f0850e8)
This commit is contained in:
Inigo Goiri 2019-07-02 13:22:30 -07:00
parent bea79e7645
commit 1dbaf74985
1 changed files with 5 additions and 4 deletions
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9
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/NetworkTopology.java
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@ -569,10 +569,11 @@ public class NetworkTopology {
private Node chooseRandom(final InnerNode parentNode,
final Node excludedScopeNode, final Collection<Node> excludedNodes,
final int totalInScopeNodes, final int availableNodes) {
Preconditions.checkArgument(
totalInScopeNodes >= availableNodes && availableNodes > 0, String
.format("%d should >= %d, and both should be positive.",
totalInScopeNodes, availableNodes));
if (totalInScopeNodes < availableNodes) {
LOG.warn("Total Nodes in scope : {} are less than Available Nodes : {}",
totalInScopeNodes, availableNodes);
return null;
}
if (excludedNodes == null || excludedNodes.isEmpty()) {
// if there are no excludedNodes, randomly choose a node
final int index = r.nextInt(totalInScopeNodes);