• Mechanisms MapReduce (MR) is slow, difficult programming distributed across multiple servers. Despite Aggregation alternative to MapReduce to improve the overall speed of data but still there arise many errors related to memory management is not fixed.
• The upgraded versions are not compatible with the the previous version. Leading to difficulties in the upgrade code. Many functions will be removed and replaced, one can hardly be reused.
• Database schema or no integrity constraints, making the data information, duplicate and inaccurate. The implementation of data analysis based on incomplete data (invalid data) as this leads to errors not acceptable.
• Can not switch to other technologies. The system has run and developed a long time so I can not knock off all and start over. This in turn makes the maintenance of the system in the long run can not be guaranteed, the difficulty of legacy systems.
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