tracer-beta
##1、tracer.c
- Use the following command to compile the tracer, and use LD_PROLOAD to intercept network requests.
gcc -fPIC -shared -o hook.so tracer.c -ldl -luuid -lcurl -lpthread
- if you want to test the tracer on your cluster, please replace the ip address in tracer.c(which is 10.211.55.38) with your own controller service(the port of controller service should still be 80).
###To Do 1、finish sendmsg/recvmsg, sendto/recvfrom, writev/readv 2、Case 2: message queue based requests tracing(memory tracing or other solutions) 3、Automatically generate the trace of a request from the trace database 4、generate hadoop tracing data and analyze
##2、controller.php Redis service should be set up as the backend of controller
##3、tracedb.sql Mysql5.5 is used as the database of tracing data
##4、read/write
###-Read
read 逻辑 getOldMethod() if(！issocket()){ old_read() } LOG type=getScoketType() if(type==INET4){// 仅仅拦截基于IPv4的网络数据，hadoop默认会在网络支持的情况下开启IPv6，所以需要关闭 LOG if (get socket && get peer){ getIP&Port(); LOG getSocketRead&WriteBufferSize(); check_filter(); if(with_uuid==0){ n=old_read(fd,buf,count); LOG if(n<=0){ LOG return n; } LOG return n; else{ LOG char id[ID_LENGTH] processMessage&ExtractUUID() } }else{ LOG return old_read(fd,buf,count); } }else if(type=UNIX){ old_write() }else if(type=UNKNOWN){ old_write() }else{ old_write() }
###-write
write 逻辑 getOldMethod() if(！issocket()){ old_write() } LOG type=getScoketType() if(type==INET4){// 仅仅拦截基于IPv4的网络数据，hadoop默认会在网络支持的情况下开启IPv6，所以需要关闭 LOG if(get socket && getpeer){ getIP&Port(); LOG getSocketRead&WriteBufferSize(); new_size=old_write_size+ID_LENGTH if (new_size almost MAX_SIZE){ LOG old_write() } if(with_uuid==0){ LOG } if(check_filter()){ LOG old_write() } if(without_uuid){ LOG old_write() } generate_uuid(); new_message=add_uuid_to_old_message();// 注意把uuid放到原生消息的前面 n=old_write(new_message); LOG if(n==new_size){ return old_size; }else if(n<=old_size){ return n; }else{ return old_size; } }else{ LOG return old_write(fd,buf,count); } }else if(type=UNIX){ old_write() }else if(type=UNKNOWN){ old_write() }else{ old_write() }