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MultipleOutputFormat and MultipleOutputs - which will last? - Hadoop - [mail # user]
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...Hello, I notice in 0.21 there is org.apache.hadoop.mapreduce.lib.output MultipleOutputs and in 0.20.1 there is org.apache.hadoop.mapred.lib MultipleOutputFormat . Going forward, ...
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Author: Saptarshi Guha,
2010-10-26, 06:35
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Task JVM reuse: A Question regarding hadoop 0.20.1 - Hadoop - [mail # user]
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...Hello, I have set mapred.job.reuse.jvm.num.tasks to -1 for re-using the JVM. My intention is to run a helper program at the beginning of the job and then feed the key/value pairs from the ta...
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Author: Saptarshi Guha,
2010-07-09, 11:38
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Partitioner in Hadoop 0.20 - Hadoop - [mail # user]
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...Hello, in hadoop 0.20.2 (current), the Partitioner class does not extend JobConfigurable (as it did in Hadoop pre 0.19). Does this mean there isn't a way to set some configurable optio...
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Author: Saptarshi Guha,
2010-06-30, 04:05
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Is the sort(in sort and shuffle) always required - Hadoop - [mail # user]
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...Hello, My question: is the sort (in the sort and shuffle) absolutely required? If I wanted mapreduce to partition (using the map) and then aggregate(using reduce) without a need for the keys...
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Author: Saptarshi Guha,
2010-06-19, 16:16
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Re: Getting job information, joining a job in hadoop 0.20.1 - Hadoop - [mail # user]
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...Hmm, Oh well, a bit of effort pays off: On 0.20.2 org.apache.hadoop.mapreduce.JobID jid org.apache.hadoop.mapreduce.JobID.forName(jd); org.apache.hadoop.mapred.JobClient jc...
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Author: Saptarshi Guha,
2010-05-26, 19:42
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Re: Getting job information, joining a job in hadoop 0.20.1 - Hadoop - [mail # user]
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...I found give, counters as obtained from RunningJob, I can still use it with the new style counters. But I'm still wondering how to get a RunningJob from a JobId. Is my Hadoop old? Rega...
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Author: Saptarshi Guha,
2010-05-26, 18:48
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Getting job information, joining a job in hadoop 0.20.1 - Hadoop - [mail # user]
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...Hello, I'm using Hadoop 0.20.1, I submitted a job using the org.apache.hadoop.mapreduce.Job approach e.g. org.apache.hadoop.mapreduce.Job _job job_.submit(); However, I would lik...
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Author: Saptarshi Guha,
2010-05-26, 18:27
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Number of combiner threads in a JVM - Hadoop - [mail # user]
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...Hello, If a combiner is set, the combiner might run in parallel with the map or the reducer. I say might because it is not guaranteed that the combiner will run. Q: How many combiner t...
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Author: Saptarshi Guha,
2010-03-16, 21:41
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Re: Class hook for Tasktracker JVM start/stop - Hadoop - [mail # user]
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...please forget i asked this question ... On Sun, Mar 14, 2010 at 2:50 AM, Saptarshi Guha wrote:...
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Author: Saptarshi Guha,
2010-03-14, 08:02
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Class hook for Tasktracker JVM start/stop - Hadoop - [mail # user]
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...Hello, The value mapred.job.reuse.jvm.num.tasks is the number of tasks a Tasktracker will process before it shuts down and another Tasktracker starts, correct? If so, is there a hook/c...
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Author: Saptarshi Guha,
2010-03-14, 07:50
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