# ECE419 Distributed Systems Project
Implementation of key-value pair storage servers using concepts and techniques from distributed systems course.
### Milestone 1:
Simple single-server storage with client communications. Cache for quicker lookup on storage server.
### Milestone 2:
Multiple servers using hash ring to for scalable, distributed data storage. Used Zookeeper to monitor server status and handle server failures.
### Milestone 3:
Implementation of replication, allowing for clients to request from multiple servers to retrieve information and prevent loss of data upon server failure.
### Milestone 4:
Notification system to identify changes to watched key-value pairs.
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<img src="https://i.imgur.com/ZMSKtqJ.png" width="600px" height="400px">
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<img src="https://imgur.com/vDYrqIB.png" width="600px" height="400px">
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ECE419-Distributed-Systems-master.zip （40个子文件） 
ECE419-Distributed-Systems-master src app_kvServer 
ClientConnection.java 11KB KVServer.java 51KB IKVServer.java 2KB LFU.java 5KB shared messages KVMessage.java 1KB KVAdminMessage.java 3KB ClientSocketListener.java 267B TextMessage.java 5KB ObjectFactory.java 639B app_kvECS IECSClient.java 3KB ECSServerMonitor.java 3KB ECSClient.java 33KB client KVStore.java 8KB KVCommInterface.java 1KB logger LogSetup.java 2KB app_kvClient KVClient.java 21KB IKVClient.java 470B ecs ECSNode.java 1KB IECSNode.java 604B testing ConnectionTest.java 952B StorageTest.java 2KB performance.java 1KB InteractionTest.java 3KB AllTests.java 932B AdditionalTest.java 2KB config.cfg 240B .idea ECE419-Distributed-Systems.iml 336B misc.xml 178B modules.xml 304B .gitignore 39B vcs.xml 167B README.md 892B libs 
zookeeper-3.4.11.jar 1.41MB slf4j-log4j12-1.6.1.jar 10KB log4j-1.2.17.jar 478KB json-20180813.jar 63KB junit-4.10.jar 247KB slf4j-api-1.6.1.jar 25KB build.xml 5KB .gitignore 185B
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