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From "Billy Pearson" <sa...@pearsonwholesale.com>
Subject Re: how many map in a map task?
Date Mon, 10 Nov 2008 08:33:39 GMT
If you are using TableMap to read the data back each mapper will map over 
all the rows in a single region.

You can use counters to count the records so we can get a total records.

but there is not set number of maps a mapper will process it depends on the 


"ma qiang" <maqiang1984@gmail.com> wrote in 
message news:2af70f430811100011n5323ff03h3417aac50d5f0cc6@mail.gmail.com...
> hi all,
>     I hava a data set stored in hbase, and I run a mapreduce program
> to analyze. Now I want to know how many map in a map task?  Who can
> tell me?
>     Thanks a lot.
> yours qiang.

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