A map-only job does not write to local disk, but rather directly to
the configured FileSystem the job's running on (HDFS usually).
It has always been so as far as I know, as map-only jobs do not do any
form of sorting/partitioning and hence do not require transient
storage.
On Thu, Apr 26, 2012 a
Hi,
We are running Hadoop jobs with mappers only, no reducers.
After each map computation, it writes its result (i.e. intermediate
results) to local disk. How fast is this speed, compared with write-speed
to HDFS?
We used TestFDSIO to do the benchmark to get write-speed to HDFS, but we
wonder how
