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distributedfilesystemgae's Introduction

DFS on Google App Engine

###project summary

In this project we have implemented distributed file system on GAE. Google app engine is a PAAS model. We don't have to worry about scaling on GAE. But some decison like where to store what file? how to maintain the metadata has to be taken. We used blob store , memcache , datastore for this. if the file size is small it will be cached to increase the system throughput and to reduce latency. Metadata is maintained in memcache and also written to datastore for recovery in case of any failures. We also implemented some basic file system functionalities such as create,delete,lookup,clear/disable cache etc. We also ran scripts to test system perfomance by measuring throughput and latency

###files

  • code/distdb.py contains main logic
  • code/*.html htmls for client operation such as create,delete.
  • code/app.yaml configuration file

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