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From "Yongjun Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8396) NPE exception can be thrown in DatanodeManager#sortLocatedBlocks
Date Sat, 06 Jun 2015 03:03:01 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8396?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14575541#comment-14575541
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Yongjun Zhang commented on HDFS-8396:
-------------------------------------

Thanks [~surendrasingh] and [~cnauroth], it's indeed a duplicate of HDFS-8055 and thanks [~anu]
for the patch.

Very sorry for late response.





> 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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