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https://issues.apache.org/jira/browse/HDFS-14180?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sihai Ke resolved HDFS-14180.
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Resolution: Duplicate
this issue id duplicated as https://issues.apache.org/jira/browse/HDFS-14181
> Suspect there is a bug in NetworkTopology.java chooseRandom function.
> ---------------------------------------------------------------------
>
> Key: HDFS-14180
> URL: https://issues.apache.org/jira/browse/HDFS-14180
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs, namenode
> Affects Versions: 2.9.2
> Reporter: Sihai Ke
> Priority: Major
>
> During reading the hadoop NetworkTopology.java, I suspect there is a bug in
> function
> chooseRandom (line 498, hadoop version 2.9.2-RC0),
> I think there is a bug in{color:#f79232} code,{color:#333333} ~excludedScope
> doesn't mean availableNodes under Scope node, and I also add unit test for
> this and get an exception.{color}{color}
> {quote}
> protected Node chooseRandom(final String scope, String excludedScope,
> final Collection<Node> excludedNodes) {
> if (excludedScope != null) {
> if (scope.startsWith(excludedScope)) {
> return null;
> }
> if (!excludedScope.startsWith(scope)) {
> excludedScope = null;
> }
> }
> Node node = getNode(scope);
> if (!(node instanceof InnerNode)) {
> return excludedNodes != null && excludedNodes.contains(node) ?
> null : node;
> }
> InnerNode innerNode = (InnerNode)node;
> int numOfDatanodes = innerNode.getNumOfLeaves();
> if (excludedScope == null) {
> node = null;
> } else {
> node = getNode(excludedScope);
> if (!(node instanceof InnerNode)) {
> numOfDatanodes -= 1;
> } else {
> numOfDatanodes -= ((InnerNode)node).getNumOfLeaves();
> }
> }
> if (numOfDatanodes <= 0) {
> LOG.debug("Failed to find datanode (scope=\"{}\" excludedScope=\"{}\")."
> + " numOfDatanodes={}",
> scope, excludedScope, numOfDatanodes);
> return null;
> }
> final int availableNodes;
> if (excludedScope == null) {
> availableNodes = countNumOfAvailableNodes(scope, excludedNodes);
> } else {
> availableNodes =
> {color:#f79232}countNumOfAvailableNodes("~" + excludedScope,
> excludedNodes);{color}
> }
> LOG.debug("Choosing random from {} available nodes on node {},"
> + " scope={}, excludedScope={}, excludeNodes={}. numOfDatanodes={}.",
> availableNodes, innerNode, scope, excludedScope, excludedNodes,
> numOfDatanodes);
> Node ret = null;
> if (availableNodes > 0) {
> ret = chooseRandom(innerNode, node, excludedNodes, numOfDatanodes,
> availableNodes);
> }
> LOG.debug("chooseRandom returning {}", ret);
> return ret;
> }{quote}
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