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Re: help in distribution of a task with hadoop - Hadoop - [mail # user]
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...Hi Bertrand -libjars option works well with the 'hadoop jar' command. Instead of executing your runnable with the plain java 'jar' command use 'hadoop jar' . When you use hadoop jar yo...
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Author: Bejoy Ks,
2012-08-13, 18:29
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Re: Problem with hadoop filesystem after restart cluster - Hadoop - [mail # user]
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...Hi Andy Is your hadoop.tmp.dir or dfs.name.dir configured to /tmp? If so it can happen as /tmp dir gets wiped out on OS restarts Regards Bejoy KS ...
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Author: Bejoy Ks,
2012-08-08, 11:27
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Re: java.io.IOException: Type mismatch in key from map: expected org.apache.hadoop.io.LongWritable, recieved org.apache.hadoop.io.Text - Hadoop - [mail # user]
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...Hi Harit You need to set the Key Type as well. If you are using different Data Type for Key and Values in your map output with respect to reduce output then you need to specify both. &...
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Author: Bejoy Ks,
2012-08-02, 23:07
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Re: No Support for setting MapFileOutputFormat in newer API - Hadoop - [mail # user]
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...HI Abhinav MapFileOutputFormat is currently not available for the new mapreduce API in hadoop 1.x . However a jira is in place to accommodate it in the future releases. https://i...
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Author: Bejoy Ks,
2012-07-27, 12:29
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Re: Hadoop 1.0.3 start-daemon.sh doesn't start all the expected daemons - Hadoop - [mail # user]
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...Hi Dinesh Try using $HADOOP_HOME/bin/start-all.sh . It starts all the hadoop daemons including TT and DN. Regards Bejoy KS...
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Author: Bejoy Ks,
2012-07-27, 12:16
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Re: Unexpected end of input stream (GZ) - Hadoop - [mail # user]
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...Hi Oleg which was the file split processed by that task. The split information is available under the status column for each task. The file split information is not available on ...
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Author: Bejoy Ks,
2012-07-24, 10:10
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Re: Error using MultipleInputs - Hadoop - [mail # user]
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...Hi Sanchita Try your code after commenting the following Line of code, //conf.setInputFormat(TextInputFormat.class); AFAIK This explicitly sets the input format as TextInpu...
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Author: Bejoy Ks,
2012-07-05, 12:08
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Re: how to fine tuning my map reduce job that is generating a lot of intermediate key-value pairs (a lot of I/O operations) - Hadoop - [mail # user]
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...Jane, From my first look, properties that can help you could be - Increase io sort factor to 100 - Increase io.sort.mb to 512Mb - increase map task heap size to 2G...
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Author: Bejoy Ks,
2012-04-03, 11:48
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Re: 0 tasktrackers in jobtracker but all datanodes present - Hadoop - [mail # user]
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...Gaurav NN memory might have hit its upper bound. As a bench mark, for every 1 million files/blocks/directories 1GB of memory is required on the NN. The number of f...
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Author: Bejoy Ks,
2012-04-02, 08:25
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Re: tasktracker/jobtracker.. expectation.. - Hadoop - [mail # user]
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...Hi Patai JobTracker automatically handles this situation by attempting the task on different nodes.Could you verify the number of attempts that these failed tasks made. W...
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Author: Bejoy Ks,
2012-03-22, 18:18
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