Explain how is data partitioned before it is sent to the reducer if no custom partitioner is defined in hadoop?
334Post New Hadoop General Questions
What are the different commands used to startup and shutdown Hadoop daemons?
What does jps command do in Hadoop?
If we want to copy 10 blocks from one machine to another, but another machine can copy only 8.5 blocks, can the blocks be broken at the time of replication?
Is there another way to check whether Namenode is working?
What is Mapper in Hadoop?
What is KeyValueTextInputFormat in Hadoop?
Hadoop achieves parallelism by dividing the tasks across many nodes, it is possible for a few slow nodes to rate-limit the rest of the program and slow down the program. What mechanism Hadoop provides to combat this?
What do you understand by unit and ()in scala?
What is purpose of RecordWriter in Hadoop?
what happens when namenode goes down during file read operation in hadoop?
What happen if one of the datanodes has much slower cpu?
What is data cleansing?
Where is hadoop-env.sh file present?
Name the most common Input Formats defined in Hadoop? Which one is default?
What are the port numbers of job tracker?
