[jira] [Created] (AMBARI-19540) Possibly too frequent calls to stack advisor as user changes sliders

["Vivek Ratnavel Subramanian (JIRA)" <ji...@apache.org>]

Vivek Ratnavel Subramanian created AMBARI-19540:
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             Summary: Possibly too frequent calls to stack advisor as user changes sliders
                 Key: AMBARI-19540
                 URL: https://issues.apache.org/jira/browse/AMBARI-19540
             Project: Ambari
          Issue Type: Bug
          Components: ambari-web
    Affects Versions: 2.5.0
            Reporter: Vivek Ratnavel Subramanian
            Assignee: Vivek Ratnavel Subramanian
             Fix For: 2.5.0


As you can see 3 calls are made while changing from 1024 to 2048 and similarly 3 calls when coming back to 1024. 
Beyond performance concern, multiple calls have a functional issue. The call includes previous value of the changed property - see the values. I would have expected the old value to be the value that was the original/saved value. However, it is wherever UI makes the stack advisor calls.
[root@smq1-1 stack-recommendations]# find . -name services.json | xargs grep -A 3 changed
./55/services.json:  "changed-configurations" : [ {
./55/services.json-    "type" : "yarn-site",
./55/services.json-    "name" : "yarn.scheduler.minimum-allocation-mb",
./55/services.json-    "old_value" : "1024"

./56/services.json:  "changed-configurations" : [ {
./56/services.json-    "type" : "yarn-site",
./56/services.json-    "name" : "yarn.scheduler.minimum-allocation-mb",
./56/services.json-    "old_value" : "1280"

./57/services.json:  "changed-configurations" : [ {
./57/services.json-    "type" : "yarn-site",
./57/services.json-    "name" : "yarn.scheduler.minimum-allocation-mb",
./57/services.json-    "old_value" : "1792"

./58/services.json:  "changed-configurations" : [ {
./58/services.json-    "type" : "yarn-site",
./58/services.json-    "name" : "yarn.scheduler.minimum-allocation-mb",
./58/services.json-    "old_value" : "2048"

./59/services.json:  "changed-configurations" : [ {
./59/services.json-    "type" : "yarn-site",
./59/services.json-    "name" : "yarn.scheduler.minimum-allocation-mb",
./59/services.json-    "old_value" : "1792"

./60/services.json:  "changed-configurations" : [ {
./60/services.json-    "type" : "yarn-site",
./60/services.json-    "name" : "yarn.scheduler.minimum-allocation-mb",
./60/services.json-    "old_value" : "1280"




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