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Under-replication warnings for Distributed Cache? - MapReduce - [mail # user]
...Hi,  we're running an 8-node Hadoop cluster with CDH2. Recently, our monitoring  tools caught warnings like this one when fsck'ing the HDFS:  /tmp/hadoop-tgp/mapred/system/job...
   Author: Christoph Schmitz, 2011-08-15, 13:40
AW: AW: How to split a big file in HDFS by size - MapReduce - [mail # user]
...You need to figure out where your actual computation takes place. I would recommend going in two steps:  1. Import your 60 GB file into HDFS. Transform it into a splittable format (e.g....
   Author: Christoph Schmitz, 2011-06-20, 14:22
[expand - 1 more] - AW: how to change default name of a sequnce file - MapReduce - [mail # user]
...int partition = context.getTaskAttemptID().getTaskID().getId();  That will get you the number that is usually appended to the part-r-) of 30th mapper - _30 ?   On Sun, Jun 19, 2011...
   Author: Christoph Schmitz, 2011-06-20, 08:01
[expand - 1 more] - AW: How to split a big file in HDFS by size - MapReduce - [mail # user]
...Simple answer: don't. The Hadoop framework will take care of that for you a nd split the file. The logical 60 GB file you see in the HDFS actually *is*  split into smaller chunks (defau...
   Author: Christoph Schmitz, 2011-06-20, 07:59
[expand - 1 more] - AW: How to merge several SequenceFile into one? - MapReduce - [mail # user]
...Oops, sorry, I answered in the wrong thread. I intended to reply to the "How to create a SequenceFile faster" issue.  Regards, Christoph  Von: 丛林 [mailto:[EMAIL PROTECTED]]  G...
   Author: Christoph Schmitz, 2011-05-12, 13:44
Accessing jobs on the JobTracker - MapReduce - [mail # user]
...Hi,  for reporting and monitoring purposes, I would like to access - from Java c ode - the job configuration of Jobs that someone else has submitted to a Jo bTracker (in 0.20.169). &nbs...
   Author: Christoph Schmitz, 2011-05-10, 11:04
AW: AW: Out-of-band writing from mapper - MapReduce - [mail # user]
...Gah, that sucks. I'm using 0.20.1-169 from Cloudera CDH2 and assumed it wou ld be there in 0.20.2 as well.  Sorry, I have no idea what happened to MultipleOutputs in 0.20.2.  Regar...
   Author: Christoph Schmitz, 2011-04-20, 13:14
AW: Out-of-band writing from mapper - MapReduce - [mail # user]
...Hi,  you are probably using the wrong MultipleOutputs from the org.apache.hadoop .mapred.lib package. There is another one in org.apache.hadoop.mapreduce.li b.output, which fits into th...
   Author: Christoph Schmitz, 2011-04-20, 12:51
[expand - 1 more] - Re: Out-of-band writing from mapper - MapReduce - [mail # user]
...Hello Harsh,  thanks for your help!  I've found that this works for me in my Mapper's setup() method:  FileSystem fs = FileSystem.get(context.getConfiguration()); // get the a...
   Author: Christoph Schmitz, 2011-04-20, 09:30
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