Hi, I am trying to figure out what actually happens when we re-execute the
master process without killing the child processes of the previous run
using cluster.
When i re-execute my code, it seems the previous workers also run again and
sometimes master process is also executed twice.
I am sharing both input and output
1. var cluster = require('cluster');
2. var cpus = require('os').cpus().length;
3.
4. if(cluster.isMaster){
5. console.log('In Master');
6. for(var i = 0; i < 3 ; i++) {
7. var worker = cluster.fork();
8. }
9. cluster.on('online',function(worker){
10. console.log("Worker Live:",worker.id);
11. });
12. cluster.workers[1].send("Bazingaa");
13. //console.log(cluster.Workers.length);
14. }
15. if(cluster.isWorker){
16. console.log("In Worker",cluster.worker.id);
17. process.on('message',function(msg){
18. console.log("Message from server:", msg, cluster.worker.id);
19. });
20. // cluster.worker.kill();
21. }
Output:
1. In Master
2. Worker Live: 1
3. Worker Live: 2
4. Worker Live: 3
5. In Worker 1
6. Message from server: Bazingaa 1
7. In Worker 2
8. In Worker 3
9. In Master
10. Worker Live: 1
11. Worker Live: 2
12. Worker Live: 3
13. In Worker 1
14. In Worker 2
15. Message from server: Bazingaa 1
16. In Master
17. In Worker 1
18. Message from server: Bazingaa 1
19. In Worker 2
20. In Worker 3
please help me figure out whats happening behind the scenes.
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