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Re: Datanode Shutting down automatically - Hadoop - [mail # user]
...You reformatted your NameNode at some point, but likely failed to alsoclear out the DN data directories, which would not auto-wipethemselves.Clear the contents of /app/hadoop/tmp/dfs/data at...
   Author: Harsh J, 2014-01-25, 06:45
Re: What is the fix for this error ? - Hadoop - [mail # user]
...Note that its not an compile error, but a warning.You need to use the getInstance(…) method instead:http://hadoop.apache.org/docs/stable2/api/org/apache/hadoop/mapreduce/Job.html#getInstance...
   Author: Harsh J, 2014-01-25, 02:57
Re: hdfs fsck -locations - Hadoop - [mail # user]
...The right syntax is to use "-files -blocks -locations", so it drillsdown all the way. You are not "missing" a feature - this has existedfor as long as I've known HDFS.In Rodrigo's output, he...
   Author: Harsh J, 2014-01-25, 01:49
Re: org.apache.hadoop.ipc.StandbyException occurs at the thirty of per hour in standby NN - Hadoop - [mail # user]
...Hi Francis,This is a non-worry, but you're basically hittinghttps://issues.apache.org/jira/browse/HDFS-3447. A temporaryworkaround could be to disable the UGI at the logging configurationlev...
   Author: Harsh J, 2014-01-24, 10:32
Re: How to learn hadoop follow Tom White - Hadoop - [mail # user]
...The book's contents should still be very relevant as the APIs haven't changed.  On Wed, Jan 22, 2014 at 11:23 AM, Cooleaf  wrote:    Harsh J...
   Author: Harsh J, 2014-01-22, 06:28
Re: How to configure multiple reduce jobs in hadoop 2.2.0 - Hadoop - [mail # user]
...Yes, you need to manually set it. Please see the API at http://hadoop.apache.org/docs/stable2/api/org/apache/hadoop/mapred/JobConf.html#setNumReduceTasks(int)  On Thu, Jan 16, 2014 at 1...
   Author: Harsh J, 2014-01-16, 07:40
Re: org.apache.hadoop.hdfs.server.protocol.DisallowedDatanodeExceptio - Hadoop - [mail # user]
...Your hdfs-site.xml on the NN defines an "includes" file, but the includes file does not list this connecting DN's proper hostname/IP, causing the NN to reject it when it tries to ask itself ...
   Author: Harsh J, 2014-01-09, 11:26
Re: Reduce task hang[EMERGENCE] - Hadoop - [mail # user]
...Does the Reduce task log (of attempt_201312201200_34795_r_000000_0) show any errors in trying to communicate with the various TaskTrackers in trying to obtain the data?  On Fri, Jan 3, ...
   Author: Harsh J, 2014-01-03, 05:13
Re: Datanode registration, port number - Hadoop - [mail # dev]
...Hi,  On Mon, Dec 23, 2013 at 9:41 AM, Dhaivat Pandya  wrote:  Curious Q: What does your cache layer aim to do btw? If its a data cache, have you checked out the design being i...
   Author: Harsh J, 2013-12-24, 05:46
Re: empty file - Hadoop - [mail # user]
...That file is still in an 'open' state. Running the below may show it up:  /opt/local/hadoop/bin/hadoop fsck /tmp/corrupt_lzo/lc_hadoop16.1386270004881.lzo  -openforwrite  On T...
   Author: Harsh J, 2013-12-12, 04:09
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