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check if a sequenceFile is corrupted - Hadoop - [mail # user]
...Is there any way to check if a seqfile is corrupted without iterate over all its keys/values till it crashes? I've seen that I can get an IOException when opening it or an IOException readin...
   Author: Marc Sturlese, 2011-03-17, 12:31
write seqfiles to hdfs from a java app without "hadoop jar" command - Hadoop - [mail # user]
...Hey there, I need to write seqfiles to an hdfs cluster using a normal java app but can't use "hadoop jar". I have access to the installation of a hadoop node. I've reached the goal launching...
   Author: Marc Sturlese, 2011-03-14, 20:25
[expand - 1 more] - Re: Tasks seem to fail randomly with nonzero status of 1 - Hadoop - [mail # user]
...Well I'ven been running these jobs for days. It's just happening since last night and now even if I restart the error keeps happening. I'am the only one using the cluster  View this mes...
   Author: Marc Sturlese, 2011-03-02, 10:32
Check lzo is working on intermediate data - Hadoop - [mail # user]
...Hey there, I am using hadoop 0.20.2. I 've successfully installed LZOCompression following these steps: https://github.com/kevinweil/hadoop-lzo  I have some MR jobs written with the new...
   Author: Marc Sturlese, 2011-02-24, 15:12
[expand - 1 more] - Re: JobConf.setQueueName("xxx") with the new api using hadoop 0.20.2 - Hadoop - [mail # user]
...Thanks, to be exact mapreduce.job.queuename http://hadoop.apache.org/mapreduce/docs/current/mapred-default.html View this message in context: http://lucene.472066.n3.nabble.com/JobConf-setQu...
   Author: Marc Sturlese, 2011-02-22, 16:18
Re: How to create hadoop-0.21.0-core.jar ? - Hadoop - [mail # user]
...I was able to compile and build the commons .jar but got errors building the hdfs .jar (and so, couldn't build the mapred .jar) Here is the thread, got no answers at the moment: http://lucen...
   Author: Marc Sturlese, 2011-01-05, 23:42
[expand - 1 more] - Re: LocalDirAllocator and getLocalPathForWrite - Hadoop - [mail # user]
...Hey Todd,    I know it's a bit odd usage but the thing is that I need to create files in the local file system, work in there with them amb after that upload them to hdfs (I use th...
   Author: Marc Sturlese, 2011-01-05, 23:26
SequenceFiles and streaming or hdfs thrift api - Hadoop - [mail # user]
...Hey there, I have the need to write a file to a hdfs cluster in php. I now I can do that with the hdfs thrift api. http://wiki.apache.org/hadoop/HDFS-APIs  The thing is I want this file...
   Author: Marc Sturlese, 2011-01-04, 18:02
small files and number of mappers - Hadoop - [mail # user]
...Hey there, I am doing some tests and wandering which are the best practices to deal with very small files which are continuously being generated(1Mb or even less).  I see that if I have...
   Author: Marc Sturlese, 2010-11-29, 23:26
Re: How to Transmit and Append Indexes - Hadoop - [mail # user]
...You could implement some scripts to send to the slave the index updates using rsync. Do something similar to what Solr does: http://wiki.apache.org/solr/CollectionDistribution  However,...
   Author: Marc Sturlese, 2010-11-19, 17:49
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