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https://issues.apache.org/jira/browse/HDFS-8396?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14543155#comment-14543155
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surendra singh lilhore commented on HDFS-8396:
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Duplicate of [HDFS-8389|https://issues.apache.org/jira/browse/HBASE-13680], its
moved to HBASE. [HBASE-13680|https://issues.apache.org/jira/browse/HBASE-13680].
> NPE exception can be thrown in DatanodeManager#sortLocatedBlocks
> ----------------------------------------------------------------
>
> Key: HDFS-8396
> URL: https://issues.apache.org/jira/browse/HDFS-8396
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Yongjun Zhang
> Assignee: Yongjun Zhang
> Labels: supportability
>
> {DNSToSwitchMapping#resolve}} could return null, thus causing
> {{DatanodeManager#sortLocatedBlocks}} to throw NPE, because of its call to
> {{String rName = dnsToSwitchMapping.resolve(hosts).get(0);}}
> The real failure reason is not obvious to user.
> Creating this jira to make the error reporting more user friendly.
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