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From Bejoy Ks <bejoy.had...@gmail.com>
Subject Re: Mappers only job, output sorted?
Date Sat, 24 Mar 2012 17:39:53 GMT
Hi Radim
        You are correct. If there is no reduce process then there won't be
any sort and shuffle phase. The output from mapper is copied directly to
hdfs itself.

Regards
Bejoy KS

2012/3/24 Radim Kolar <hsn@filez.com>

> i have mappers only job - number of reducers set to 0. Its hadoop 0.22 and
> output from job is this:
>
> 2012-03-24 18:24:22,117 WARN org.apache.hadoop.util.**NativeCodeLoader:
> Unable to load native-hadoop library for your platform... using
> builtin-java classes where applicable
> 2012-03-24 18:24:22,734 INFO org.apache.hadoop.metrics.jvm.**JvmMetrics:
> Initializing JVM Metrics with processName=MAP, sessionId=
> 2012-03-24 18:24:37,748 WARN org.apache.hadoop.conf.**Configuration:
> user.name is deprecated. Instead, use mapreduce.job.user.name
> 2012-03-24 18:24:38,718 INFO org.apache.hadoop.mapred.Task:  Using
> ResourceCalculatorPlugin : null
> 2012-03-24 18:24:41,447 INFO org.apache.hadoop.mapred.Task:
> Task:attempt_201201250916_**0074_m_000036_0 is done. And is in the
> process of commiting
> 2012-03-24 18:24:42,472 INFO org.apache.hadoop.mapred.Task: Task
> attempt_201201250916_0074_m_**000036_0 is allowed to commit now
> 2012-03-24 18:24:42,478 INFO org.apache.hadoop.mapreduce.**lib.output.**FileOutputCommitter:
> Saved output of task 'attempt_201201250916_0074_m_**000036_0' to
> /cznewgen/db-fixed
> 2012-03-24 18:24:42,479 INFO org.apache.hadoop.mapred.Task: Task
> 'attempt_201201250916_0074_m_**000036_0' done.
>
> is this job still sorting keys in mapper output? Because task status for
> mapper says "map > sort". I do not need output sorted.
>

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