hadoop-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Adam Kawa <kawa.a...@gmail.com>
Subject Re: issue about running example job use custom mapreduce var
Date Tue, 10 Dec 2013 23:14:26 GMT
Please try



2013/12/10 ch huang <justlooks@gmail.com>

> hi,maillist:
>                 i try assign reduce number in commandline but seems not
> useful,i run tera sort like this
>
> # hadoop jar /usr/lib/hadoop-mapreduce/hadoop-mapreduce-examples.jar
> terasort /alex/terasort/1G-input /alex/terasort/1G-output
> -Dmapreduce.job.reduces=34
>
> so default mapred-site.xml assign reducer number is 16,i try run it with
> 34 reducers,but the job run still as 16 reducers number,why?
>
> here is some output:
>
>         Job Counters
>                 Launched map tasks=1
>                 Launched reduce tasks=16
>                 Rack-local map tasks=1
>                 Total time spent by all maps in occupied slots (ms)=2318
>                 Total time spent by all reduces in occupied slots
> (ms)=99714
>

Mime
View raw message