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https://issues.apache.org/jira/browse/HDFS-8396?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yongjun Zhang resolved HDFS-8396.
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Resolution: Duplicate
> 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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