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Re: Issue with loading the Snappy Codec - Hadoop - [mail # user]
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...Can you restart tasktrackers once and run the job again? It refreshes the class path. On Sun, Apr 15, 2012 at 11:58 AM, Bas Hickendorff wrote: ...
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Author: john smith,
2012-04-15, 10:04
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"Reduce shuffle bytes" in GUI - Hadoop - [mail # user]
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...Hey folks, I have my job tracker GUI which shows a lot of information about the running/completed jobs. I am interested in the field "Reduce shuffle bytes". I want to know how it...
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Author: john smith,
2011-09-28, 05:48
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Reducer hanging ( swapping? ) - Hadoop - [mail # user]
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...Hi Folks, I am running hive on a 10 node cluster. Since my hive queries have joins in them, their reduce phases are a bit heavy. I have 2GB RAM on each TT . The problem is that m...
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Author: john smith,
2011-09-21, 23:52
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Re: Out of heap space errors on TTs - Hadoop - [mail # user]
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...Hi, Its a simple join, select count(*) from customer JOIN supplier ON (customer.c_nationkey supplier.s_nationkey); customer(2.2GB) and supplier (137MB) are TPCH table...
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Author: john smith,
2011-09-19, 13:43
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Re: Out of heap space errors on TTs - Hadoop - [mail # user]
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...Hi all, Thanks for the inputs... Can I reduce the io.sort.mb ? (owing to the fact that I have less ram size , 2GB) My conf files doesn't have an entry mapred.child.java.opt...
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Author: john smith,
2011-09-19, 13:32
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Out of heap space errors on TTs - Hadoop - [mail # user]
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...Hey guys, I am running hive and I am trying to join two tables (2.2GB and 136MB) on a cluster of 9 nodes (replication = 3) Hadoop version - 0.20.2 Each data node memory - 2GB HAD...
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Author: john smith,
2011-09-19, 12:43
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Ganglia for hadoop monitoring - Hadoop - [mail # user]
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...Hi all, First of all, ganglia integration with hadoop is an awesome feature. Kudos to the hadoop devs. Unfortunately its not working out for me. I am unable to see hadoop specific metr...
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Author: john smith,
2011-09-17, 07:15
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Re: Datanodes going down frequently - Hadoop - [mail # user]
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...Hi Aaron, I haven't really run any MR jobs on my cluster till now. I've just been pushing data into the hdfs . So network shouldn't be a problem. Initially my HADOOP_HEAPSIZE was...
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Author: john smith,
2011-09-16, 17:03
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Re: Datanodes going down frequently - Hadoop - [mail # user]
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...Hi All, Thanks for your inputs, @Aaron : No, they aren't recovering. They are losing network connectivity and they are not getting it back. I am unable to ssh to them and I need ...
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Author: john smith,
2011-09-16, 04:45
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Datanodes going down frequently - Hadoop - [mail # user]
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...Hi all, I am running a 10 node cluster (1NN + 9DN, ubuntu server 10.04, 2GB RAM each). I am facing a strange problem. My datanodes go down randomly and nothing showup in the logs. They...
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Author: john smith,
2011-09-15, 22:06
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