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HyperThreading in TaskTracker nodes? - HDFS - [mail # user]
...I would like to get some opinions / recommendations about the pros and cons of enabling HyperThreading on TaskTracker nodes. Presumably memory could be an issue, but is there anything to be ...
   Author: Terry Healy, 2013-02-05, 15:19
TT nodes distributed cache failure - HDFS - [mail # user]
...Running hadoop-0.20.2 on a 20 node cluster.  When running a Map/Reduce job that uses several .jars loaded into the Distributed cache, several (~4) nodes have their map jobs fails becaus...
   Author: Terry Healy, 2013-01-25, 17:48
Map Failure reading .gz (gzip) files - HDFS - [mail # user]
...I'm trying to run a Map-only job using .gz input format. For testing, I have one compressed log file in the input directory. If the file is un-zipped, the code works fine.  Watching the...
   Author: Terry Healy, 2013-01-14, 21:25
Re: 'Cannot roll edit log' - HDFS - [mail # user]
...Further info: From the log of secondary NN:  INFO org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode: Posted URL AAA.xxx.yyy.zzz:50070putimage=1&port=50090&machine=
   Author: Terry Healy, 2012-08-15, 16:53
Re: Unable to start NN after rack assignment attempt - HDFS - [mail # user]
...Todd-  Thanks for your reply. I went out on a limb and started digging in the source code and figures it was FSImage. So I saved it, and copied over the copy from my checkpoint director...
   Author: Terry Healy, 2012-05-18, 18:28
FSCK / -move and -delete FAIL - HDFS - [mail # user]
...Running 1.0.2 on cluster with 10 datanodes. After running stop-all.sh and start-all.sh following the addition of a new datanode, the NN stays in SafeMode.  hadoop fsck /  reports s...
   Author: Terry Healy, 2012-05-15, 20:18
Re: Unable to restart 1.0.2 NN, DFS - HDFS - [mail # user]
...Not a lot of interest I suppose, but the problem is believed to have been caused by not following the recommended upgrade procedure when going from 1.0.1 to 1.0.2.  On 5/4/12 9:56 AM, T...
   Author: Terry Healy, 2012-05-14, 15:51
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