limited commented on issue #1970: Not possible to disable retry for MSO
URL: 
https://github.com/apache/incubator-trafficcontrol/issues/1970#issuecomment-371191645
 
 
   I see two issues that Mike is reporting
   1) Traffic Ops always places a `parent_retry` token into `parent.config` 
because the default value is set to `both`[1]. We would like to be able to 
remove the presence of `parent_retry`. Removing `parent_retry` uses the traffic 
server default of dead server errors (timeouts) as opposed to `both` which 
configures traffic server to retry on simple errors (404s), unavailable server 
errors (503s) and dead server errors. This should definitely be fixed in 2.3
   
   2) This behavior was unexpectedly changed during an upgrade (i.e. TO started 
inserting `parent_retry=both` when this option was previously missing). Need to 
discuss if we want to fix the migration (probably not since I don't think 
anyone is still using 2.0) or just release note this caveat as part of the 
bugfix. 
   
   [1] 
https://github.com/apache/incubator-trafficcontrol/blob/e2c498f2f6125c46d9c6222e79aec0439786725e/traffic_ops/app/lib/API/Configs/ApacheTrafficServer.pm#L2327

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