A possible Isilon HDFS issue with Hadoop 2.7.1

A simple hadoop fs -cat command may throw the following exception:

java.lang.IllegalStateException: Must not use direct buffers with InputStream API

at com.google.common.base.Preconditions.checkState(Preconditions.java:145)

at org.apache.hadoop.hdfs.protocol.datatransfer.PacketReceiver.doReadFully(PacketReceiver.java:211)

at org.apache.hadoop.hdfs.protocol.datatransfer.PacketReceiver.doRead(PacketReceiver.java:134)

at org.apache.hadoop.hdfs.protocol.datatransfer.PacketReceiver.receiveNextPacket(PacketReceiver.java:102)

at org.apache.hadoop.hdfs.RemoteBlockReader2.readNextPacket(RemoteBlockReader2.java:201)

at org.apache.hadoop.hdfs.RemoteBlockReader2.read(RemoteBlockReader2.java:152)

at org.apache.hadoop.hdfs.DFSInputStream$ByteArrayStrategy.doRead(DFSInputStream.java:737)

at org.apache.hadoop.hdfs.DFSInputStream.readBuffer(DFSInputStream.java:793)

at org.apache.hadoop.hdfs.DFSInputStream.readWithStrategy(DFSInputStream.java:853)

at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:896)

at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:697)

at java.io.DataInputStream.readShort(DataInputStream.java:312)

at org.apache.hadoop.fs.shell.Display$Text.getInputStream(Display.java:136)

at org.apache.hadoop.fs.shell.Display$Cat.processPath(Display.java:102)

at org.apache.hadoop.fs.shell.Command.processPaths(Command.java:317)

at org.apache.hadoop.fs.shell.Command.processPathArgument(Command.java:289)

at org.apache.hadoop.fs.shell.Command.processArgument(Command.java:271)

at org.apache.hadoop.fs.shell.Command.processArguments(Command.java:255)

at org.apache.hadoop.fs.shell.Command.processRawArguments(Command.java:201)

at org.apache.hadoop.fs.shell.Command.run(Command.java:165)

at org.apache.hadoop.fs.FsShell.run(FsShell.java:287)

at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)

at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:84)

at org.apache.hadoop.fs.FsShell.main(FsShell.java:340)

When looking into this artitle:

http://blog.sequenceiq.com/blog/2014/03/07/read-from-hdfs/

I found a possible solution and it works for me:

        <property>
                <name>dfs.client.use.legacy.blockreader</name>
                <value>true</value>
        </property>