please check parameter "mapred.map.tasks" is equals to 2? ________________________________ 发件人: Yanbo Liang [[email protected]] 发送时间: 2013年3月14日 23:11 收件人: [email protected] 主题: Re: Why hadoop is spawing two map over file size 1.5 KB ?
I guess may be one of them is the speculative execution. You can check the parameter "mapred.map.tasks.speculative.execution" to ensure whether it is allowed speculative execution. You can get the precise information that whether it is speculative map task from the tasktracker log. 2013/3/12 samir das mohapatra <[email protected]<mailto:[email protected]>> Hi All, I have very fundamental doubt, I have file having size 1.5KB and block size is default block size, But i could see two mapper it got creted during the Job. Could you please help to get whole picture why it is . Regards, samir.
