stack created HDFS-6047:
---------------------------
Summary: TestPread NPE inside in DFSInputStream
hedgedFetchBlockByteRange
Key: HDFS-6047
URL: https://issues.apache.org/jira/browse/HDFS-6047
Project: Hadoop HDFS
Issue Type: Bug
Affects Versions: 2.4.0
Reporter: stack
Assignee: stack
Fix For: 2.4.0
Our [~andrew.wang] saw this on internal test cluster running trunk:
{code}
java.lang.NullPointerException: null
at
org.apache.hadoop.hdfs.DFSInputStream.hedgedFetchBlockByteRange(DFSInputStream.java:1181)
at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:1296)
at org.apache.hadoop.fs.FSInputStream.readFully(FSInputStream.java:78)
at
org.apache.hadoop.fs.FSDataInputStream.readFully(FSDataInputStream.java:108)
at org.apache.hadoop.hdfs.TestPread.pReadFile(TestPread.java:151)
at
org.apache.hadoop.hdfs.TestPread.testMaxOutHedgedReadPool(TestPread.java:292)
{code}
TestPread was failing.
The NPE comes of our presuming there always a chosenNode as we set up hedged
reads inside in hedgedFetchBlockByteRange (chosenNode is null'd each time
through the loop). Usually there is a chosenNode but need to allow for case
where there is not.
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