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RE: steps to fix data block corruption after server failure - Hadoop - [mail # user]
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...Tadas, One time I remember disconnecting a bunch of DNodes from my dev cluster i/o of required, more elegant "exclude". The next thing I learned was my FS was corrupted. I did no...
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Author: Kartashov, Andy,
2012-12-20, 17:28
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RE: unsubscrib - Hadoop - [mail # user]
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...I thought it was supposed to be addressed to unsubscribe-user.....@..... hehehe From: Prabhat Pandey [mailto:[EMAIL PROTECTED]] Sent: Wednesday, December 19, 2012 12:14 PM To: [EMAIL ...
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Author: Kartashov, Andy,
2012-12-19, 17:18
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build-truck-branch/ version control / POM / check out /git / maven / ant - Hadoop - [mail # user]
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...Why does one need to build an app from source if one can download gzip file and gunzip and use the app. Why git, why check out... What's considered "building"? I have been exposed to bits an...
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Author: Kartashov, Andy,
2012-12-18, 15:56
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RE: Datanode: "Cannot start secure cluster without privileged resources" - Hadoop - [mail # user]
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...Try running $sudo jps or jps as root "#jps" You will get more info, i.e: ****Jps ***** SecondaryNameNode ***** JobTracker ***** NameNode From: [EMAIL PROTECTED] [mai...
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Author: Kartashov, Andy,
2012-11-26, 14:52
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RE: MapReduce APIs - Hadoop - [mail # user]
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...Harsh, Thanks for the " DistributedCache.addCacheFile(URI, job.getConfiguration());" suggestion. What class is your instance job belongs to? It is not Job class, for sure. So must be J...
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Author: Kartashov, Andy,
2012-11-26, 14:48
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RE: Datanode: "Cannot start secure cluster without privileged resources" - Hadoop - [mail # user]
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...You could also run $sudo service --status-all From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] Sent: Monday, November 26, 2012 8:41 AM To: [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Su...
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Author: Kartashov, Andy,
2012-11-26, 14:36
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RE: Argumments to Hadoop Command - Hadoop - [mail # user]
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...With the Error: " Output directory hdfs://.com/user/krishna/input already exists" simply delete the output directory perior to runnign the job. $hadoop fs -rm "output/file" ...
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Author: Kartashov, Andy,
2012-11-26, 14:29
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RE: guessing number of reducers. - Hadoop - [mail # user]
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...Bejoy, I've read somethere about keeping number of mapred.reduce.tasks below the reduce task capcity. Here is what I just tested: Output 25Gb. 8DN cluster with 16 Map and Reduce ...
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Author: Kartashov, Andy,
2012-11-21, 17:49
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RE: guessing number of reducers. - Hadoop - [mail # user]
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...Jamal, This is what I am using... After you start your job, visit jobtracker's WebUI :50030 And look for Cluster summary. Reduce Task Capacity shall hint you what optimally set y...
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Author: Kartashov, Andy,
2012-11-21, 16:43
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io.file.buffer.size - Hadoop - [mail # user]
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...Guys, I've read that increasing above (default 4kb) number to, say 128kb, might speed things up. My input is 40mln serialised records coming from RDMS and I noticed that with inc...
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Author: Kartashov, Andy,
2012-11-21, 16:18
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