Introduction Hadoop is a open source software use for distribute computing. It is reliable, scalable and perfectly use for big data purpose. Hadoop cluster commonly consist of NameNode, secondary NameNode, resource manager and DataNode. NameNode itself store block metadata on the file call fsimage. Secondary NameNode is a NameNode helper. It log changes to fsimage (checkpoint) but do not store the actual fsimage file. Secondary NameNode update frequently and update NameNode fsimage by combining update logs with fsimage to achieve most recent fsimage.