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From "Yongjun Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-8396) NPE exception can be thrown in DatanodeManager#sortLocatedBlocks
Date Thu, 14 May 2015 00:16:00 GMT
Yongjun Zhang created HDFS-8396:
-----------------------------------

             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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