hbase-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
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 
input.

Billy



"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.
> 



Mime
View raw message