Thanks very much. However, I want to use the number of the map in my program. for example. There are 100 map in a map task, and I want to collect all the values, and analyze these values then output the last result in the last map. generally, there is no ouput in the first 99 map, only output exists in the last map. So I should know how many map in a map task.
On Mon, Nov 10, 2008 at 4:33 PM, Billy Pearson <[EMAIL PROTECTED]> wrote: > 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" <[EMAIL PROTECTED]> wrote in message > news:[EMAIL PROTECTED] >> >> 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. >> > > >
