I recall seeing this error due to a network misconfiguration. You may want to verify that IP addresses and host names are correctly setup.
From: Caesar Samsi Reply-To: "[email protected]<mailto:[email protected]>" Date: Wednesday, June 3, 2015 at 8:07 PM To: "[email protected]<mailto:[email protected]>" Subject: ack with firstBadLink as 192.168.1.12:50010? I’ve just built my distributed cluster but am getting the following error when I try to use HDFS. I’ve traced it by telnet to 192.168.1.12 50010 and it just waits there waiting for a connection but never happens. If I telnet on that host using localhost (127.0.0.1) the telnet connection happens immediately. What could be the cause? >> hduser@hadoopmaster ~/hadoop $ hdfs dfs -copyFromLocal input input 15/06/03 20:03:36 INFO hdfs.DFSClient: Exception in createBlockOutputStream java.io.IOException: Got error, status message , ack with firstBadLink as 192.168.1.12:50010 at org.apache.hadoop.hdfs.protocol.datatransfer.DataTransferProtoUtil.checkBlockOpStatus(DataTransferProtoUtil.java:140) at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.createBlockOutputStream(DFSOutputStream.java:1334) at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSOutputStream.java:1237) at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:449) 15/06/03 20:03:36 INFO hdfs.DFSClient: Abandoning BP-101149352-192.168.1.10-1433386347922:blk_1073741829_1005 15/06/03 20:03:36 INFO hdfs.DFSClient: Excluding datanode DatanodeInfoWithStorage[192.168.1.12:50010,DS-1347a6fe-6bad-4df8-88cb-21378b847839,DISK] 15/06/03 20:03:36 WARN hdfs.DFSClient: Slow waitForAckedSeqno took 70947ms (threshold=30000ms)
