6.824 Lab 3: Fault-tolerant Key/Value Service Due Part A: Mar 13 23:59 Due Part B: Apr 10 23:59 Introduction In this lab you will build a fault-tolerant key/value storage service using your Raft library from lab 2. You key/value service will be a rep…

Part B: Key/value service with log compaction Do a git pull to get the latest lab software. As things stand now with your lab code, a rebooting server replays the complete Raft log in order to restore its state. However, it's not practical for a long…

6.824 Lab 2: Raft Part 2A Due: Feb 23 at 11:59pm Part 2B Due: Mar 2 at 11:59pm Part 2C Due: Mar 9 at 11:59pm Introduction This is the first in a series of labs in which you'll build a fault-tolerant key/value storage system. In this lab you'll implem…

这两天在Qtcreator上编译程序的时候莫名其妙的出现了FTH: (7156): *** Fault tolerant heap shim applied to current process. This is usually due to previous crashes. ***的问题,清除掉所有的文件,重新qmake和构建都不能解决这个问题. 有人说修改注册表中HKEY_LOCAL_MACHINE\Software\Microsoft\FTH\Enabled的值为0,然而并没有什么用处.…

概述 lab2中实现了raft协议,本lab将在raft之上实现一个可容错的k/v存储服务,第一部分是实现一个不带日志压缩的版本,第二部分是实现日志压缩.时间原因我只完成了第一部分. 设计思路 如上图,lab2实现了raft协议,本lab将实现kvserver.每个raft都关联一个kvserver,Clerks发送Put(), Append(), Get() RPC给leader服务器中的kvserver,kvserver收到请求后将操作打包成Log Entry提交给raft,然后阻塞等待ra…

Part 2C Do a git pull to get the latest lab software. If a Raft-based server reboots it should resume service where it left off. This requires that Raft keep persistent state that survives a reboot. The paper's Figure 2 mentions which state should be…

要想容错,该怎么办? 父actor首先要获知子actor的失败状态,然后确定该怎么办, “怎么办”这回事叫做“supervisorStrategy".   // Restart the storage child when StorageException is thrown.   // After 3 restarts within 5 seconds it will be stopped.   override val supervisorStrategy = OneForOneStrate…

Introduction In this lab you will modify YFS to cache extents, reducing the load on the extent server and improving YFS performance. The main challenge is to ensure consistency of extents cached at different yfs_clients: to make sure that each yfs_cl…

Part 2B We want Raft to keep a consistent, replicated log of operations. A call to Start() at the leader starts the process of adding a new operation to the log; the leader sends the new operation to the other servers in AppendEntries RPCs.我们希望Raft保持…

这个问题偶尔碰到两次,现在又遇上了,解决办法如下: 打开注册表,设置HKLM\Software\Microsoft\FTH\Enabled 为0 打开CMD,运行Rundll32.exe fthsvc.dll,FthSysprepSpecialize 参考http://msdn.microsoft.com/en-us/library/dd744764…