Heart Beat in Hadoop & Tenacity

Heart beat :

Job tracker send signal to task tracker

Send /receive

Communication between job tracker and task tracker

O – success

1 – failure

Task attempt is two types :

1.minimum attempt – 2

2.maximum attempt :8

Maximum times data is not received that task failed task

Tenacity (4hrs):

When kill task occurs we will use tenacity


Redistribution(automatic redistribution)

Maximum 65,536 only why ?


128 – sn

  1. – session

4 -4account

1 -master node

127 -slave node


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