Apologies if the post was ambiguous. I was speaking on the API lines, in that you need to add it in XML form into that quoted field name, rather than try to add a new property name that it won't accept (your original curl). You require to do something like this (notice the name of the config being the safety valve described earlier, and that the value is in XML form with the contents of what you are trying to add in): curl -iv -X PUT -H "Content-Type:application/json" -H "Accept:application/json" -d '{"items":[{ "name": "core_site_safety_valve","value": "<property><name>hadoop.proxyuser.ztsps.users</name><value>*</value></property><property><name>hadoop.proxyuser.ztsps.groups</name><value>*</value></property>"}]}' http://admin:admin@10.1.0.1:7180/api/v12/clusters/cluster/services/hdfs/config
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