By Milannic(milannic.cheng.liu@gmail.com)

this program replies on libevent-2.0.21 for network communication, libconfig-1.4.9 for node configuration and libdb(Berkeley DB)-5.1.29 for data persistently store.Uthash is used for C-implementation Hashtable.

Please Use ./mk in the root dir to download and install the dependencies(those libraries will be installed in ./.local, and sources files will be kept in ./dep-lib)

Compilation of the program needs gcc-4.8 which is indicated in the Makefile(some C99 features are used),actually gcc-4.7 is also available, a symbol link may be used to do so.

##1.src source files ###1.1 config-comp implementation of configuration file parsing module. ###1.2 consensus implementation of normal case request consensus and deliver ###1.3 db implementation of database operation module. ###1.4 replica-sys the replicate node which integrates other modules to be one. ###1.5 util some helper functions. ###1.6 include header files of the program.

Generally Speaking, we expose system_initialize(user_cb),system_run(nod),system_exit(node) three functions to you, you just need to pass your own callback function to the system, and run it.

When there is request from client and is agreed among the majority of the replica group, your user call back function will be invoked.

Now we have four test(make test after make): ##1.Sample Test blank test for illustration . ##2.Node Start Test start a primary node, make sure all the initializations finished. ##3.Ping Test start a primary node and one secondary node,then kill the primary node, the secondary should notice that it haven't heard from the leader for a long time, then start a leader election. ##4.Normal Case Test start a replica group, and also many clients sending requests to the primary concurrently. The output in all the replica group should be completely the same.

##Leader Election Component ##Client Side Library ##Proxy Integrated with DMT

Potential Bug is possible in Current Version,Any Suggestion is welcomed.