[HDFS-10908] Improve StripedBlockReader#createBlockReader error logging

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.0.0-alpha2
• Fix Version/s: 3.0.0-alpha2
• Component/s: erasure-coding
• Target Version/s: 3.0.0-alpha2
• Assignee: Manoj Govindassamy
• Reporter: Wei-Chiu Chuang
• Created: 27/Sep/16 13:06
• Updated: 30/Sep/16 20:13
• Resolved: 30/Sep/16 19:37

Description

In StripedBlockReader#createBlockReader if any IOException is thrown, the error is logged at debug level and then returns a null. This means in a typical configuration an NPE may be thrown without logging a cause if the StripedBlockReader object is accessed.