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. -- This message was sent by Atlassian JIRA (v6.2#6252)