Erasure Coding: SequentialBlockGroupIdGenerator#nextValue may cause block id conflicts

java.io.EOFException: Premature EOF: no length prefix available
	at org.apache.hadoop.hdfs.protocolPB.PBHelper.vintPrefixed(PBHelper.java:2343)
	at org.apache.hadoop.hdfs.protocol.datatransfer.PipelineAck.readFields(PipelineAck.java:244)
	at org.apache.hadoop.hdfs.DataStreamer$ResponseProcessor.run(DataStreamer.java:823)
2015-04-23 23:21:08,666 INFO  mortbay.log (Slf4jLog.java:info(67)) - Stopped SelectChannelConnector@localhost:0
2015-04-23 23:21:08,769 INFO  ipc.Server (Server.java:stop(2540)) - Stopping server on 57920
2015-04-23 23:21:08,770 INFO  datanode.DataNode (BlockReceiver.java:receiveBlock(826)) - Exception for BP-1850767374-10.239.12.51-1429802363548:blk_-9223372036854775737_1007
java.io.InterruptedIOException: Interrupted while waiting for IO on channel java.nio.channels.SocketChannel[closed]. 60000 millis timeout left.
	at org.apache.hadoop.net.SocketIOWithTimeout$SelectorPool.select(SocketIOWithTimeout.java:342)
	at org.apache.hadoop.net.SocketIOWithTimeout.doIO(SocketIOWithTimeout.java:157)
	at org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:161)
	at org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:131)
	at java.io.BufferedInputStream.fill(BufferedInputStream.java:246)
	at java.io.BufferedInputStream.read1(BufferedInputStream.java:286)
	at java.io.BufferedInputStream.read(BufferedInputStream.java:345)
	at java.io.DataInputStream.read(DataInputStream.java:149)
	at org.apache.hadoop.io.IOUtils.readFully(IOUtils.java:201)
	at org.apache.hadoop.hdfs.protocol.datatransfer.PacketReceiver.doReadFully(PacketReceiver.java:213)
	at org.apache.hadoop.hdfs.protocol.datatransfer.PacketReceiver.doRead(PacketReceiver.java:134)
	at org.apache.hadoop.hdfs.protocol.datatransfer.PacketReceiver.receiveNextPacket(PacketReceiver.java:109)
	at org.apache.hadoop.hdfs.server.datanode.BlockReceiver.receivePacket(BlockReceiver.java:472)
	at org.apache.hadoop.hdfs.server.datanode.BlockReceiver.receiveBlock(BlockReceiver.java:787)
	at org.apache.hadoop.hdfs.server.datanode.DataXceiver.writeBlock(DataXceiver.java:793)
	at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.opWriteBlock(Receiver.java:137)
	at org.apache.hadoop.hdfs.protocol.datatransfer.Receiver.processOp(Receiver.java:74)
	at org.apache.hadoop.hdfs.server.datanode.DataXceiver.run(DataXceiver.java:250)
	at java.lang.Thread.run(Thread.java:745)
2015-04-23 23:21:08,769 INFO  datanode.DataNode (BlockReceiver.java:run(1250)) - PacketResponder: BP-1850767374-10.239.12.51-1429802363548:blk_-9223372036854775737_1007, type=LAST_IN_PIPELINE, downstreams=0:[]: Thread is interrupted.
2015-04-23 23:21:08,776 WARN  datanode.DataNode (BPServiceActor.java:offerService(756)) - BPOfferService for Block pool BP-1850767374-10.239.12.51-1429802363548 (Datanode Uuid 72b12e39-77cb-463d-a919-0ac06d166fcd) service to localhost/127.0.0.1:36877 interrupted
2015-04-23 23:21:08,776 INFO  ipc.Server (Server.java:run(846)) - Stopping IPC Server Responder