[Solved] hadoop:hdfs.DFSClient: Exception in createBlockOutputStream

hadoop ran the task fine, then moved hadoop-dir to a different location and reported the following error.

java.io.EOFException: Premature EOF: no length prefix available
at org.apache.hadoop.hdfs.protocolPB.PBHelper.vintPrefixed(PBHelper.java:1492)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.createBlockOutputStream(DFSOutputStream.java:1155)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSOutputStream.java:1088)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:514)
15/03/24 18:26:40 INFO hdfs.DFSClient: Abandoning BP-1909118226-192.168.19.234-1427110524238:blk_1073762363_21550
15/03/24 18:26:40 INFO hdfs.DFSClient: Excluding datanode 192.168.21.24:50010
copy from: /root/zenggq/jn2/data2w/t0.head_2000 to /recom1000/t0.head_2000
15/03/24 18:26:41 INFO hdfs.DFSClient: Exception in createBlockOutputStream
java.io.EOFException: Premature EOF: no length prefix available
at org.apache.hadoop.hdfs.protocolPB.PBHelper.vintPrefixed(PBHelper.java:1492)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.createBlockOutputStream(DFSOutputStream.java:1155)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSOutputStream.java:1088)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:514)
15/03/24 18:26:41 INFO hdfs.DFSClient: Abandoning BP-1909118226-192.168.19.234-1427110524238:blk_1073762365_21552
15/03/24 18:26:41 INFO hdfs.DFSClient: Excluding datanode 192.168.21.23:50010
15/03/24 18:26:41 INFO hdfs.DFSClient: Exception in createBlockOutputStream
java.io.IOException: Bad connect ack with firstBadLink as 192.168.21.24:50010
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.createBlockOutputStream(DFSOutputStream.java:1166)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSOutputStream.java:1088)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:514)
15/03/24 18:26:41 INFO hdfs.DFSClient: Abandoning BP-1909118226-192.168.19.234-1427110524238:blk_1073762366_21553
15/03/24 18:26:41 INFO hdfs.DFSClient: Excluding datanode 192.168.21.24:50010
15/03/24 18:26:41 INFO hdfs.DFSClient: Exception in createBlockOutputStream
java.io.EOFException: Premature EOF: no length prefix available
at org.apache.hadoop.hdfs.protocolPB.PBHelper.vintPrefixed(PBHelper.java:1492)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.createBlockOutputStream(DFSOutputStream.java:1155)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSOutputStream.java:1088)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:514)
15/03/24 18:26:41 INFO hdfs.DFSClient: Abandoning BP-1909118226-192.168.19.234-1427110524238:blk_1073762367_21554
15/03/24 18:26:41 INFO hdfs.DFSClient: Excluding datanode 192.168.19.236:50010
15/03/24 18:26:41 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:1492)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.createBlockOutputStream(DFSOutputStream.java:1155)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSOutputStream.java:1088)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:514)
15/03/24 18:26:41 INFO hdfs.DFSClient: Abandoning BP-1909118226-192.168.19.234-1427110524238:blk_1073762368_21555
15/03/24 18:26:41 INFO hdfs.DFSClient: Excluding datanode 192.168.21.30:50010
15/03/24 18:26:41 WARN hdfs.DFSClient: DataStreamer Exception
java.io.IOException: Unable to create new block.
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSOutputStream.java:1100)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:514)
15/03/24 18:26:41 WARN hdfs.DFSClient: Could not get block locations. Source file “/recom1000/t1.head_2000” – Aborting…
Exception in thread “main” java.io.EOFException: Premature EOF: no length prefix available
at org.apache.hadoop.hdfs.protocolPB.PBHelper.vintPrefixed(PBHelper.java:1492)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.createBlockOutputStream(DFSOutputStream.java:1155)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSOutputStream.java:1088)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:514)
15/03/24 18:26:41 ERROR hdfs.DFSClient: Failed to close file /recom1000/t1.head_2000
java.io.EOFException: Premature EOF: no length prefix available
at org.apache.hadoop.hdfs.protocolPB.PBHelper.vintPrefixed(PBHelper.java:1492)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.createBlockOutputStream(DFSOutputStream.java:1155)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSOutputStream.java:1088)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:514)
[[email protected] jn2]#

 

After looking around for answers no, one said the datanode process was not there and the other said the firewall was left off. Turns out I had no problem with either of those.

Then I deleted the data directory under hadoop-dir. Then reformatted the namenode

hadoop namenode -format

And then the then was fine

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