jiajunwang opened a new issue #1928:
URL: https://github.com/apache/helix/issues/1928
### Describe the bug
When fetching an empty property store zk node through the Helix rest API,
user get this response,
"HTTP ERROR 500 Request failed."
If check the log, then we observe this error log,
> Caused by: java.lang.NullPointerException
> at java.lang.String.<init>(String.java:614) ~[?:?]
> at
org.apache.helix.rest.server.resources.helix.PropertyStoreAccessor.getPropertyByPath(PropertyStoreAccessor.java:82)
~[helix-rest-1.0.2.200.jar:?]
This is not informative and does not align with what we promised that, "if
the node is not in the required Helix ZNRecord format, the API returns content
directly."
### To Reproduce
Use
"...admin/v2/namespaces/{namespace}/clusters/{cluster}/propertyStore/{path}" to
fetch an zk node with no content.
### Expected behavior
Throw a meaningful error message.
Note that returning an empty string is also a possible option but it might
be confusing. Return No content error would be clearer.
### Additional context
Add any other context about the problem here.
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