Limitations of Hadoop 1
Scalability
- Max cluster size ~5000 nodes
- Max concurrent tasks ~40,000
- Coarse Synchronization in JobTracker
- Failure kills Queued and running JobTracker
Hard partition of resources into map and reduce slots
- Non-optimal Resource Utilization
Lacks support for Alternate Paradigms and Services
- Iterative applications in MapReduce are 10x slower
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