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When trying to add a taskmanager or node, if the corresponding taskmanager/node already exists in blocklist, we propose to introduce two processing behaviors:

1. Return error, the .The URL will be 
   1. POST: http://{jm_rest_address:port}/blocklist/nodes/<id>
   2. POST: http://{jm_rest_address:port}/blocklist/taskmanagers/<id>
2. Merge. The newly added item and the existing item will be merged into one, the URL will be:
   1. POST: http://{jm_rest_address:port}/blocklist/nodes/<id>:merge
   2. POST: http://{jm_rest_address:port}/blocklist/taskmanagers/<id>:merge

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