snleee commented on code in PR #10969:
URL: https://github.com/apache/pinot/pull/10969#discussion_r1247597496
##########
pinot-controller/src/main/java/org/apache/pinot/controller/api/resources/PinotInstanceRestletResource.java:
##########
@@ -390,4 +391,33 @@ public SuccessResponse updateBrokerResource(
Response.Status.INTERNAL_SERVER_ERROR, e);
}
}
+
+ @POST
+ @Path("/instances/safetyCheck/dropInstance")
Review Comment:
`/instances/dropInstance/validate` maybe a better path?
We do have `POST /schemas/validate` & `POST /tables/validate`
##########
pinot-controller/src/main/java/org/apache/pinot/controller/helix/core/PinotHelixResourceManager.java:
##########
@@ -3148,6 +3137,31 @@ public PinotResourceManagerResponse dropInstance(String
instanceName) {
return PinotResourceManagerResponse.success("Instance " + instanceName + "
dropped");
}
+ /**
+ * Utility to perform a safety check of the operation to drop an instance.
+ * If the resource is not safe to drop the utility lists all the possible
reasons.
+ * @param instanceName Pinot instance name
+ * @return List of reasons why the operation is unsafe. Empty list if the
operation is safe.
+ */
+ public List<String> instanceDropSafetyCheck(String instanceName) {
+ List<String> issues = new ArrayList<>();
+ // Check if the instance is live
+ if (_helixDataAccessor.getProperty(_keyBuilder.liveInstance(instanceName))
!= null) {
+ issues.add(String.format("Instance %s is still live", instanceName));
Review Comment:
+1 on this change. We can probably use some error code or enum status. If we
want to add the explanation, we can model the response as `code/status, message`
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