Once client submit the request , YARN create the App Master, While creating AppMaster it occupy the maximum Available memory and cores , container will be created. 1)During the Map task , it will read inputsplits data on jar (by default text input format), if it is 1 gb data with 256 MB block size, 10 splits will be created. 2) Inputs splits are read by Linerecordreader , linereocrd is able read data from FSDataInputStream, it will till it complete the all input splits for MAP task, 3) Once it complete MAP task with Linerecord , Recordreader read completed and reducer task will run on it.
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