Karthik questions

Karthik answers

• Hadoop 2.6.0 official examples: Yarn (MR2) much slower than Map Reduce (MR1) in single node setup
• YARN vs Spark processing engine based on real time application?
• Merging multiple LZO compressed files on HDFS
• How to decide when to use a Map-Side Join or Reduce-Side while writing an MR code in java?
• Hadoop partitioner
• Hadoop NameNode recovery from metadata backup
• MapReduce Output ArrayWritable
• Checksum verification in Hadoop
• Where does zookeeper and Kafka fit in hadoop 2.6 cluster