What are the Limitations of Hadoop 1.0 ?

1.	What are the Limitations of Hadoop 1.0 ?
Answer» Only one NAMENODE is possible to configure. Secondary NameNode was to TAKE HOURLY backup of MetaData from NameNode. It is only suitable for Batch Processing of a vast amount of DATA, which is already in the Hadoop System. It is not ideal for Real-time Data Processing. It supports up to 4000 Nodes per Cluster. It has a SINGLE component: JobTracker to perform many activities like Resource Management, Job Scheduling, Job Monitoring, Re-scheduling Jobs etc. JobTracker is the single point of failure. It supports only one Name No and One Namespace per Cluster. It does not help the Horizontal Scalability of NameNode. It runs only Map/Reduce jobs.

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