Sean Mackrory created HDFS-12151:
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Summary: Hadoop 2 clients cannot writeBlock to Hadoop 3 DataNodes
Key: HDFS-12151
URL: https://issues.apache.org/jira/browse/HDFS-12151
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: Sean Mackrory
Assignee: Sean Mackrory
Trying to write to a Hadoop 3 DataNode with a Hadoop 2 client currently fails.
On the client side it looks like this:
{code}
17/07/14 13:31:58 INFO hdfs.DFSClient: Exception in createBlockOutputStream
java.io.EOFException: Premature EOF: no length prefix available
at
org.apache.hadoop.hdfs.protocolPB.PBHelper.vintPrefixed(PBHelper.java:2280)
at
org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.createBlockOutputStream(DFSOutputStream.java:1318)
at
org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSOutputStream.java:1237)
at
org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:449){code}
But on the DataNode side there's an ArrayOutOfBoundsException because there
aren't any targetStorageTypes:
{code}
java.lang.ArrayIndexOutOfBoundsException: 0
at
org.apache.hadoop.hdfs.server.datanode.DataXceiver.writeBlock(DataXceiver.java:815)
at
org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.opWriteBlock(Receiver.java:173)
at
org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.processOp(Receiver.java:107)
at
org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:290)
at java.lang.Thread.run(Thread.java:745){code}
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