Ambari hadoop cluster + the best way to Modify configurations - json

Question

We have ambari cluster , and clients are installed on Linux redhat machines ,
yum list | grep ambari-server
ambari-server.x86_64 2.5.0.3-7 #ambari-2.5.0.3
We found a nice way to set a update a value's in ambari cluster as the following:
Update a parameter ( from Ambari server machine )
/var/lib/ambari-server/resources/scripts/configs.sh set localhost c1 mapred-site "mapreduce.map.memory.mb" "512"
While:
CONFIG_TYPE = mapred-site
CONFIG_KEY = mapreduce.map.memory.mb
But we have a little problem here.....:
From my example - mapred-site is a “CONFIG-TYPE”
According to the script –help:
<CONFIG_TYPE>: One of the various configuration types in Ambari. Ex:global, core-site, hdfs-site, mapred-queue-acls, etc.
So how to know the right CONFIG_TYPE value for the CONFIG_KEY value ?,
For more info about the script:
https://cwiki.apache.org/confluence/display/AMBARI/Modify+configurations “Edit configuration using configs.sh” paragraph
remark - in order to see all CONFIG-TYPE values and CONFIG_KEY values I generated the following blueprint.json file:
curl -u admin:admin -H "X-Requested-By: ambari" -X GET http://101.16.235.2:8080/api/v1/clusters/HDP01?format=blueprint -o /tmp/blueprint.json
.
grep "\-site" /tmp/blueprint.json
"tez-interactive-site" : {
"hdfs-site" : {
"yarn-site" : {
"hiveserver2-site" : {
"ams-hbase-security-site" : {
"ams-site" : {
"mapred-site" : {
"hive-site" : {
"tez-site" : {
"webhcat-site" : {

Answer 1

You may also clone Ambari repo, and grep/parse configuration files like
https://github.com/apache/ambari/blob/trunk/ambari-server/src/main/resources/common-services/HDFS/2.1.0.2.0/configuration/core-site.xml
Per-stack configurations like https://github.com/apache/ambari/blob/trunk/ambari-server/src/main/resources/stacks/HDP/2.6/services/HDFS/configuration/core-site.xml inherit/override values from common-services and previous stack versions.
Hope this helps