[HDFS-8396] NPE exception can be thrown in DatanodeManager#sortLocatedBlocks

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Labels: supportability
• Assignee: Yongjun Zhang
• Reporter: Yongjun Zhang
• Created: 14/May/15 00:15
• Updated: 06/Jun/15 03:03
• Resolved: 06/Jun/15 03:00

Description

{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.

Issue Links

• duplicates: HDFS-8055 NullPointerException when topology script is missing.