update

Author: zhongwencool

doc/global.md

@@ -51,16 +51,16 @@
    5. But the global task manager only running one in the same cluster.
 
 ### Implementation
-1. checking if `global_jobs` is empty when ecron application starts.
-2. The process of global is finished when `global_jobs` is empty.
-3. `ecron_sup` would start `ecron_monitor`(gen_server), when `global_jobs` is not empty.
-4. `ecron_monitor` monitors node's status by [net_kernel:monitor_nodes(true)](http://erlang.org/doc/man/net_kernel.html#monitor_nodes-1), when it initializes.
+1. The top supervisor `ecron_sup` start at first.
+2. Nothing will happen if the `global_jobs` is empty.
+3. When `global_jobs` is not empty, `ecron_sup` would start_link `ecron_monitor` worker (gen_server).
+4. `ecron_monitor` subscribes node's up/down messages by [net_kernel:monitor_nodes(true)](http://erlang.org/doc/man/net_kernel.html#monitor_nodes-1), when it initializes.
 5. Checking if there is enough `ecron` process in the cluster(`global_quorum_size`).
-6. Trying to terminate global manager job process when `ecron` process's number less than `global_quorum_size`.
-7. Otherwise, trying to start a global manager job gen_server, This process register by [global:register_name/2](http://erlang.org/doc/man/global.html#register_name-2).
-8. All nodes competitively register this global jobs manager process, only one node will success, other node's `ecron_monitor` only link this process.
-9. The `ecron_monitor` will receive notification, when node down/up or global jobs manager process die.
-10. Enter step 5 again, when receiving notification.
+6. Trying to terminate global job manager process when cluster's `ecron` number less than `global_quorum_size`.
+7. Otherwise, trying to start a global job manager process, This gen_server register by [global:register_name/2](http://erlang.org/doc/man/global.html#register_name-2).
+8. All the nodes are rushing to register this global jobs manager process, only one node will success, other node's `ecron_monitor` would link this process if the process already exists.
+9. The `ecron_monitor` will receive notification, when node down/up or the global job manager dies.
+10. Enter step 5 again, When notified.
 
 ```
      NodeA             NodeB              NodeC