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https://issues.apache.org/jira/browse/HADOOP-11072?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14124255#comment-14124255
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jay vyas commented on HADOOP-11072:
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I made this a subtask of HADOOP-3619 because i think probably the logging is an
essential component of any patch which aims to fix DNS related stuff in DNS.java
> better Logging in DNS.java
> ---------------------------
>
> Key: HADOOP-11072
> URL: https://issues.apache.org/jira/browse/HADOOP-11072
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: net
> Affects Versions: 2.3.0, 2.4.0
> Reporter: jay vyas
> Priority: Minor
> Labels: logging
>
> The DNS.java class should be more informative, and possibly fail early when
> reverse DNS is broken. Right now it is vulnerable to a cryptic ArrayIndex
> exception.
> {noformat}
> parts = hostIp.getHostAddress(....)
> String reverseIp = parts[3] + parts[2] ...
> {noformat}
> During this patch I think we can also improve a couple other minor logging
> statements in the net package.
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