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pass4sureit provides you a comprehensive and customizable learning experience by giving you PDF format questions and answers that enables you to pass your Cloudera CCA-470 exam with full confidence and surety. PDF format questions and answers will improvise your knowledge and makes you more literate. After comprehensive study of these questions and answers you can justify your preparation by CCA-470 practice test.
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When the Task <strong>in</strong>stances f<strong>in</strong>ish, successfully or not, the task tracker notifies the JobTracker. The<br />
TaskTrackers also send out heartbeat messages to the JobTracker, usually every few m<strong>in</strong>utes, to<br />
reassure the JobTracker that it is still alive. These message also <strong>in</strong>form the JobTracker of the number<br />
of available slots, so the JobTracker can stay up to date with where <strong>in</strong> the cluster work can be<br />
delegated.<br />
Note: How many Daemon processes run on a Hadoop system?<br />
Hadoop is comprised of five separate daemons. Each of these daemon run <strong>in</strong> its own JVM. Follow<strong>in</strong>g<br />
3 Daemons run on Master nodes NameNode - This daemon stores and ma<strong>in</strong>ta<strong>in</strong>s the metadata for<br />
HDFS.<br />
Secondary NameNode - Performs housekeep<strong>in</strong>g functions for the NameNode.<br />
JobTracker - Manages MapReduce jobs, distributes <strong>in</strong>dividual tasks to mach<strong>in</strong>es runn<strong>in</strong>g the Task<br />
Tracker.<br />
Follow<strong>in</strong>g 2 Daemons run on each Slave nodes<br />
DataNode – Stores actual HDFS data blocks.<br />
TaskTracker - Responsible for <strong>in</strong>stantiat<strong>in</strong>g and monitor<strong>in</strong>g <strong>in</strong>dividual Map and Reduce tasks.<br />
Reference:<br />
24 Interview <strong>Questions</strong> & Answers for Hadoop MapReduce developers, What is a Task Tracker <strong>in</strong><br />
Hadoop? How many <strong>in</strong>stances of TaskTracker run on a Hadoop Cluster<br />
P a g e | 6<br />
P a g e | 6
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