[HDFS-13539] DFSStripedInputStream NPE when reportCheckSumFailure

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.2.0, 3.1.1, 3.0.3
• Target Version/s: 3.0.4
• Hadoop Flags: Reviewed
• Assignee: Xiao Chen
• Reporter: Xiao Chen
• Created: 08/May/18 22:32
• Updated: 14/May/18 16:52
• Resolved: 14/May/18 16:30

Description

We have seem the following exception with DFSStripedInputStream.

readDirect: FSDataInputStream#read error:
NullPointerException: java.lang.NullPointerException
        at org.apache.hadoop.hdfs.DFSStripedInputStream.readWithStrategy(DFSStripedInputStream.java:402)
        at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:831)
        at org.apache.hadoop.fs.FSDataInputStream.read(FSDataInputStream.java:147)

Line 402 is reportCheckSumFailure, and currentLocatedBlock is the only possible null object. (Because currentLocatedBlock.getLocations() cannot be null - LocatedBlock constructor checks locs and would assign a EMPTY_LOCS if it's null)

Original exception is masked by the NPE.