[ https://issues.apache.org/jira/browse/HDFS-8396?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Yongjun Zhang updated HDFS-8396: -------------------------------- Issue Type: Improvement (was: Bug) > 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332)