Is only the same IP printed in all such messages? Can you check the DN log in that machine to see if it reports any form of issues?
Also, did your jobs fail or kept going despite these hiccups? I notice you're threading your clients though (?), but I can't tell if that may cause this without further information. On Fri, Apr 27, 2012 at 5:19 AM, Mohit Anchlia <mohitanch...@gmail.com> wrote: > I had 20 mappers in parallel reading 20 gz files and each file around > 30-40MB data over 5 hadoop nodes and then writing to the analytics > database. Almost midway it started to get this error: > > > 2012-04-26 16:13:53,723 [Thread-8] INFO org.apache.hadoop.hdfs.DFSClient - > Exception in createBlockOutputStream > 17.18.62.192:50010java.io.IOException: Bad connect ack with > firstBadLink as > 17.18.62.191:50010 > > I am trying to look at the logs but doesn't say much. What could be the > reason? We are in pretty closed reliable network and all machines are up. -- Harsh J
