Yongjun Zhang created HDFS-8396:
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Summary: 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: Bug
Reporter: Yongjun Zhang
Assignee: Yongjun Zhang
{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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