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https://issues.apache.org/jira/browse/HADOOP-3757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12613469#action_12613469
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Lohit Vijayarenu commented on HADOOP-3757:
------------------------------------------
This happens because hostsReader::excludes is added to the report in
FSNamesystem::getDatanodeListForReport
{noformat}
for (Iterator<String> it = hostsReader.getExcludedHosts().iterator();
it.hasNext();) {
mustList.put(it.next(), "");
}
{noformat}
When dfs.exclude.file is parsed, they are just added to internal array list
without validating.
We should cleanup the list in refreshNodes().
> HDFS Web UI displays comments from dfs.exclude file and counts them as dead
> nodes
> ---------------------------------------------------------------------------------
>
> Key: HADOOP-3757
> URL: https://issues.apache.org/jira/browse/HADOOP-3757
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.16.2, 0.17.0, 0.17.1
> Reporter: Jim Huang
>
> I am putting comments in dfs.exclude file such as:
> {noformat}
> # 32 GB memory upgrades
> {noformat}
> HDFS Web UI counts each word in the commented line as a dead node.
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