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https://issues.apache.org/jira/browse/HDFS-14909?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16952007#comment-16952007
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Surendra Singh Lilhore commented on HDFS-14909:
-----------------------------------------------
Below code it decreasing count for {{excludedScope}}.
{code:java}
if (excludeRoot != null && root.isAncestor(excludeRoot)) {
if (excludeRoot instanceof DFSTopologyNodeImpl) {
availableCount -= ((DFSTopologyNodeImpl)excludeRoot)
.getSubtreeStorageCount(type);
} else {
availableCount -= ((DatanodeDescriptor)excludeRoot)
.hasStorageType(type) ? 1 : 0;
}
} {code}
Again this code decreasing count for {{excludedNodes}}, but is excluded node is
part of {{excludedScope}} then no need to decrease the count.
{code:java}
if (excludedNodes != null) {
for (Node excludedNode : excludedNodes) {
if (excludedNode instanceof DatanodeDescriptor) {
availableCount -= ((DatanodeDescriptor) excludedNode)
.hasStorageType(type) ? 1 : 0;
} else if (excludedNode instanceof DFSTopologyNodeImpl) {
availableCount -= ((DFSTopologyNodeImpl) excludedNode)
.getSubtreeStorageCount(type);
} else if (excludedNode instanceof DatanodeInfo) {
...................
}
}{code}
Because of this {{availableCount}} is in negative value which is not expected
{code:java}
if (availableCount <= 0) {
// should never be <0 in general, adding <0 check for safety purpose
return null;
}{code}
> DFSNetworkTopology#chooseRandomWithStorageType() should not decrese storage
> count for excluded node which is already part of excluded scope
> --------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-14909
> URL: https://issues.apache.org/jira/browse/HDFS-14909
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 3.1.1
> Reporter: Surendra Singh Lilhore
> Assignee: Surendra Singh Lilhore
> Priority: Major
>
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