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Hadoop, mail # dev - Hadoop Mapper Intermediate Result Storage with No Reducer


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Hadoop Mapper Intermediate Result Storage with No Reducer
Xun TANG 2012-04-25, 20:49
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 much the gap is.

Another question is, when did Hadoop move this chuck to HDFS?

Any thoughts, guys? Thanks ahead.

Xun