Post 5 – How HDFS handles Namenode Failure ?
In the previous post, we discussed HDFS and how Hadoop handles Datanode failure. In this post, we will discuss how Hadoop handles Namenode failure. Hadoop 1.0 -> Namenode is a single point of failure. Failure handling is highly costly and time consuming due to recovery of edit logs. Hadoop 2.0 -> Introduction of Secondary Namenode…