[GitHub] [incubator-pegasus] Shuo-Jia opened a new issue #578: use json result to get target value replace complex regex to filter in scripts

[GitBox <gi...@apache.org>]

Shuo-Jia opened a new issue #578:
URL: https://github.com/apache/incubator-pegasus/issues/578


   ## Feature Request
   
   **Is your feature request related to a problem? Please describe:**
   <!-- A clear and concise description of what the problem is. Ex. I'm always frustrated when [...] -->
   Now in scripts file, we usually use complex regex to filter the shell command result, just as:
   https://github.com/apache/incubator-pegasus/blob/fc1d2aa05df7bcea25116e1533a919b43f478209/scripts/pegasus_rolling_update.sh#L63
   which is not elegant. Since the shell supports the json format result, we can consider using the json result:
   ```
   {
       "cluster_info": {
           "meta_servers": "127.0.0.1:34601,127.0.0.1:34602,127.0.0.1:34603",
           "primary_meta_server": "127.0.0.1:34603",
           "zookeeper_hosts": "127.0.0.1:22181",
           "zookeeper_root": "/pegasus/onebox/127.0.0.1",
           "meta_function_level": "steady",
           "balance_operation_count": "move_pri=0,copy_pri=0,copy_sec=0,total=0",
           "primary_replica_count_stddev": "0.00",
           "total_replica_count_stddev": "0.00"
       }
   }
   
   ```
    to get the target value
   
   


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