[HDFS-3436] adding new datanode to existing pipeline fails in case of Append/Recovery

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.0-alpha, 0.23.8, 3.0.0-alpha1
• Fix Version/s: 2.0.2-alpha
• Component/s: datanode
• Hadoop Flags: Reviewed
• Assignee: Vinayakumar B
• Reporter: Brahma Reddy Battula
• Created: 17/May/12 10:36
• Updated: 12/May/16 18:18
• Resolved: 23/May/12 18:01

Description

Scenario:
=========

1. Cluster with 4 DataNodes.
2. Written file to 3 DNs, DN1->DN2->DN3
3. Stopped DN3,
Now Append to file is failing due to addDatanode2ExistingPipeline is failed.

CLinet Trace

2012-04-24 22:06:09,947 INFO  hdfs.DFSClient (DFSOutputStream.java:createBlockOutputStream(1063)) - Exception in createBlockOutputStream
java.io.IOException: Bad connect ack with firstBadLink as *******:50010
	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.createBlockOutputStream(DFSOutputStream.java:1053)
	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.setupPipelineForAppendOrRecovery(DFSOutputStream.java:943)
	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:461)
2012-04-24 22:06:09,947 WARN  hdfs.DFSClient (DFSOutputStream.java:setupPipelineForAppendOrRecovery(916)) - Error Recovery for block BP-1023239-10.18.40.233-1335275282109:blk_296651611851855249_1253 in pipeline *****:50010, ******:50010, *****:50010: bad datanode ******:50010
2012-04-24 22:06:10,072 WARN  hdfs.DFSClient (DFSOutputStream.java:run(549)) - DataStreamer Exception
java.io.EOFException: Premature EOF: no length prefix available
	at org.apache.hadoop.hdfs.protocol.HdfsProtoUtil.vintPrefixed(HdfsProtoUtil.java:162)
	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.transfer(DFSOutputStream.java:866)
	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.addDatanode2ExistingPipeline(DFSOutputStream.java:843)
	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.setupPipelineForAppendOrRecovery(DFSOutputStream.java:934)
	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:461)
2012-04-24 22:06:10,072 WARN  hdfs.DFSClient (DFSOutputStream.java:hflush(1515)) - Error while syncing
java.io.EOFException: Premature EOF: no length prefix available
	at org.apache.hadoop.hdfs.protocol.HdfsProtoUtil.vintPrefixed(HdfsProtoUtil.java:162)
	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.transfer(DFSOutputStream.java:866)
	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.addDatanode2ExistingPipeline(DFSOutputStream.java:843)
	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.setupPipelineForAppendOrRecovery(DFSOutputStream.java:934)
	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:461)
java.io.EOFException: Premature EOF: no length prefix available
	at org.apache.hadoop.hdfs.protocol.HdfsProtoUtil.vintPrefixed(HdfsProtoUtil.java:162)
	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.transfer(DFSOutputStream.java:866)
	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.addDatanode2ExistingPipeline(DFSOutputStream.java:843)
	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.setupPipelineForAppendOrRecovery(DFSOutputStream.java:934)
	at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:461)

DataNode Trace

2012-05-17 15:39:12,261 ERROR datanode.DataNode (DataXceiver.java:run(193)) - host0.foo.com:49744:DataXceiver error processing TRANSFER_BLOCK operation  src: /127.0.0.1:49811 dest: /127.0.0.1:49744
java.io.IOException: BP-2001850558-xx.xx.xx.xx-1337249347060:blk_-8165642083860293107_1002 is neither a RBW nor a Finalized, r=ReplicaBeingWritten, blk_-8165642083860293107_1003, RBW
  getNumBytes()     = 1024
  getBytesOnDisk()  = 1024
  getVisibleLength()= 1024
  getVolume()       = E:\MyWorkSpace\branch-2\Test\build\test\data\dfs\data\data1\current
  getBlockFile()    = E:\MyWorkSpace\branch-2\Test\build\test\data\dfs\data\data1\current\BP-2001850558-xx.xx.xx.xx-1337249347060\current\rbw\blk_-8165642083860293107
  bytesAcked=1024
  bytesOnDisk=102
at org.apache.hadoop.hdfs.server.datanode.DataNode.transferReplicaForPipelineRecovery(DataNode.java:2038)
	at org.apache.hadoop.hdfs.server.datanode.DataXceiver.transferBlock(DataXceiver.java:525)
	at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.opTransferBlock(Receiver.java:114)
	at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.processOp(Receiver.java:78)
	at org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:189)
	at java.lang.Thread.run(Unknown Source)