Hi, Default number of map tasks is 2. You can set mapred.map.tasks to 1 to avoid this.
Regards, Viji On Thu, Sep 26, 2013 at 4:28 PM, Sai Sai <[email protected]> wrote: > Hi > Here is the input file for the wordcount job: > ****************** > Hi This is a simple test. > Hi Hadoop how r u. > Hello Hello. > Hi Hi. > Hadoop Hadoop Welcome. > ****************** > > After running the wordcount successfully > here r the counters info: > > *************** > Job Counters SLOTS_MILLIS_MAPS 0 0 8,386 > Launched reduce tasks 0 0 1 > Total time spent by all reduces waiting after reserving slots (ms) 0 0 0 > Total time spent by all maps waiting after reserving slots (ms) 0 0 0 > Launched map tasks 0 0 2 > Data-local map tasks 0 0 2 > SLOTS_MILLIS_REDUCES 0 0 9,199 > *************** > My question why r there 2 launched map tasks when i have only a small file. > Per my understanding it is only 1 block. > and should be only 1 split. > Then for each line a map computation should occur > but it shows 2 map tasks. > Please let me know. > Thanks > Sai >
