- The Key must implement the org.apache.hadoop.io.WritableComparable interface.
- The value must implement the org.apache.hadoop.io.Writable interface.
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2014
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- What is ‘Key value pair’ in HDFS?
- Can you explain how do ‘map’ and ‘reduce’ work?
- What is MapReduce?
- What is the difference between Gen1 and Gen2 Hadoo...
- What is a Secondary Namenode? Is it a substitute t...
- What if rack 2 and datanode fails?
- Do we need to place 2nd and 3rd data in rack 2 only?
- On what basis data will be stored on a rack?
- What is a rack?
- What is the communication channel between client a...
- Is client the end user in HDFS?
- Who is a ‘user’ in HDFS?
- Doesn’t Google have its very own version of DFS?
- On what basis Namenode will decide which datanode ...
- Does hadoop always require digital data to process?
- When we send a data to a node, do we allow settlin...
- Are job tracker and task trackers present in separ...
- If datanodes increase, then do we need to upgrade ...
- If a data Node is full how it’s identified?
- How indexing is done in HDFS?
- If we want to copy 10 blocks from one machine to a...
- What are the benefits of block transfer?
- What is a ‘block’ in HDFS?
- Are Namenode and job tracker on the same host?
- What is a heartbeat in HDFS?
- Is Namenode machine same as datanode machine as in...
- What is a task tracker?
- What is a job tracker?
- What is a daemon?
- Why do we use HDFS for applications having large d...
- What is a Datanode?
- What is a metadata?
- Is Namenode also a commodity?
- What is a commodity hardware? Does commodity hardw...
- What is streaming access?
- What is throughput? How does HDFS get a good throu...
- Since the data is replicated thrice in HDFS, does ...
- Replication causes data redundancy then why is is ...
- What is Fault Tolerance?
- What is HDFS?
- What are the key features of HDFS?
- What are the core components of Hadoop?
- What is structured and unstructured data?
- What is the basic difference between traditional R...
- Give examples of some companies that are using Had...
- Give a brief overview of Hadoop history.
- What are some of the characteristics of Hadoop fra...
- Why do we need Hadoop?
- Why the name ‘Hadoop’?
- What is Hadoop?
- Who are ‘Data Scientists’?
- How the HDFS Blocks are replicated?
- How the Client communicates with HDFS?
- What is a DataNode? How many instances of DataNode...
- What is a NameNode? How many instances of NameNode...
- What is HDFS Block size? How is it different from ...
- What is HDFS ? How it is different from traditiona...
- When is the reducers are started in a MapReduce job?
- What is the meaning of speculative execution in Ha...
- What is a IdentityMapper and IdentityReducer in Ma...
- How analysis of Big Data is useful for organizations?
- How Big is ‘Big Data’?
- According to IBM, what are the three characteristi...
- Can you give a detailed overview about the Big Dat...
- What is the Hadoop MapReduce API contract for a ke...
- What is Writable & WritableComparable interface?
- Can you give some examples of Big Data?
- What is BIG DATA?
- What are combiners? When should I use a combiner i...
- Where is the Mapper Output (intermediate kay-value...
- Can I set the number of reducers to zero?
- Does MapReduce programming model provide a way for...
- How NameNode Handles data node failures?
- What is the difference between HDFS and NAS ?
- What is configuration of a typical slave node on H...
- How many Daemon processes run on a Hadoop system?
- What is a Task instance in Hadoop? Where does it run?
- What is a Task Tracker in Hadoop? How many instanc...
- How JobTracker schedules a task?
- What is a JobTracker in Hadoop? How many instances...
- Windows Server Security Recommendations
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May
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