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How does datanodes tackle DataNode failures?

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Ur question is wrong. i think namenode tracks datanode failure.datanode send heartbeat to namenode. if datanode not sending heartbeat at that time namenode treat as datanode not working.. consider as dead node.
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My name is Rajesh , working as a Recruiter from past 6 years and thought to change my career into software (development / admin/ testing ) am seeking for some suggestion which technology I need to learn ? Any job after training ? Or where I can get job within 3 months after finishing my training programme- your advices are highly appreciated
Mr rajesh if you want to enter in to software Choose SAP BW AND SAP HANA because BW and HANA rules the all other erp tools next 50 years.it provides rubust reporting tools for quicker decesion of business It very easy to learn
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I want to take online classes on database/ ETL testing.

 

Also i look forward to teach Mathematics/Science for class X-XII

if you are intrested on DBMS data base mangement system you can contact me . This will cover concept of database , normalization and SQL query
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Which Hadoop course should I take?
It is always better to take the help of an instructor. Go to an institue or take an online course. When you decide to learn Hadoop. You need to start with understanding Hadoop's architecture and its abilities,...
Srinivasan
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