how much blocks a file has depends on your data status,please consider it
according to your data status
2012/1/18 prasenjit mukherjee
> Does it mean that on an average 1 file has only 2 blocks ( with
> replication=1 ) ?
>
>
> On 1/18/12, M. C. Srivas wrote:
> > Konstantin's paper
> > http:
configuration.
>
> If you change the block size for your Hadoop cluster configureation (in the
> hdfs-site.xml file), this method may bring some side-effects.
>
> 1) waste of disk space;
> 2) difficulty to balance HDFS;
> 3) low Map stage data locality;
>
> Bests!
>
>
just the blocksize 128M or 256M,it may reduce the number of mappers per job
2011/11/17 Jay Vyas
> Hi guys : In a shared cluster environment, whats the best way to reduce the
> number of mappers per job ? Should you do it with inputSplits ? Or simply
> toggle the values in the JobConf (i.e. inc
