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From Arpit Agarwal <aagar...@hortonworks.com>
Subject Re: ack with firstBadLink as
Date Thu, 04 Jun 2015 05:44:45 GMT
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: "user@hadoop.apache.org<mailto:user@hadoop.apache.org>"
Date: Wednesday, June 3, 2015 at 8:07 PM
To: "user@hadoop.apache.org<mailto:user@hadoop.apache.org>"
Subject: ack with firstBadLink as

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 50010 and it just waits there waiting for a connection
but never happens.

If I telnet on that host using localhost ( 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
                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-
15/06/03 20:03:36 INFO hdfs.DFSClient: Excluding datanode DatanodeInfoWithStorage[,DS-1347a6fe-6bad-4df8-88cb-21378b847839,DISK]
15/06/03 20:03:36 WARN hdfs.DFSClient: Slow waitForAckedSeqno took 70947ms (threshold=30000ms)
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