diff --git a/python/ray/autoscaler/_private/aws/node_provider.py b/python/ray/autoscaler/_private/aws/node_provider.py
index 7288dc2d4..c49c9046e 100644
--- a/python/ray/autoscaler/_private/aws/node_provider.py
+++ b/python/ray/autoscaler/_private/aws/node_provider.py
@@ -4,7 +4,7 @@ import threading
 from collections import defaultdict
 import logging
 import time
-from typing import Any, Dict
+from typing import Any, Dict, List
 
 import boto3
 import botocore
@@ -52,6 +52,35 @@ def make_ec2_client(region, max_retries, aws_credentials=None):
         "ec2", region_name=region, config=config, **aws_credentials)
 
 
+def list_ec2_instances(region: str) -> List[Dict[str, Any]]:
+    """Get all instance-types/resources available in the user's AWS region.
+    Args:
+        region (str): the region of the AWS provider. e.g., "us-west-2".
+    Returns:
+        final_instance_types: a list of instances. An example of one element in
+        the list:
+            {'InstanceType': 'm5a.xlarge', 'ProcessorInfo':
+            {'SupportedArchitectures': ['x86_64'], 'SustainedClockSpeedInGhz':
+            2.5},'VCpuInfo': {'DefaultVCpus': 4, 'DefaultCores': 2,
+            'DefaultThreadsPerCore': 2, 'ValidCores': [2],
+            'ValidThreadsPerCore': [1, 2]}, 'MemoryInfo': {'SizeInMiB': 16384},
+            ...}
+
+    """
+    final_instance_types = []
+    instance_types = boto3.client(
+        "ec2", region_name=region).describe_instance_types()
+    final_instance_types.extend(copy.deepcopy(instance_types["InstanceTypes"]))
+    while "NextToken" in instance_types:
+        instance_types = boto3.client(
+            "ec2", region_name=region).describe_instance_types(
+                NextToken=instance_types["NextToken"])
+        final_instance_types.extend(
+            copy.deepcopy(instance_types["InstanceTypes"]))
+
+    return final_instance_types
+
+
 class AWSNodeProvider(NodeProvider):
     def __init__(self, provider_config, cluster_name):
         NodeProvider.__init__(self, provider_config, cluster_name)
@@ -456,8 +485,8 @@ class AWSNodeProvider(NodeProvider):
             return cluster_config
         cluster_config = copy.deepcopy(cluster_config)
 
-        instances_list = boto3.client("ec2").describe_instance_types()[
-            "InstanceTypes"]
+        instances_list = list_ec2_instances(
+            cluster_config["provider"]["region"])
         instances_dict = {
             instance["InstanceType"]: instance
             for instance in instances_list
@@ -488,5 +517,8 @@ class AWSNodeProvider(NodeProvider):
                         "resources"] = autodetected_resources
                     cli_logger.print("Updating the resources of {} to {}.",
                                      node_type, autodetected_resources)
-
+            else:
+                raise ValueError("Instance type " + instance_type +
+                                 " is not available in AWS region: " +
+                                 cluster_config["provider"]["region"] + ".")
         return cluster_config
diff --git a/python/ray/autoscaler/_private/util.py b/python/ray/autoscaler/_private/util.py
index f3f28d549..6aa6a7bb6 100644
--- a/python/ray/autoscaler/_private/util.py
+++ b/python/ray/autoscaler/_private/util.py
@@ -105,10 +105,8 @@ def fillout_defaults(config: Dict[str, Any]) -> Dict[str, Any]:
     try:
         defaults = _fillout_available_node_types_resources(defaults)
     except Exception:
-        # We don't want to introduce new errors with filling available node
-        # types resources feature.
-        logger.exception("Failed to autodetect node resources")
-
+        logger.exception("Failed to autodetect node resources.")
+        raise
     return defaults
 
 
diff --git a/python/ray/tests/test_autoscaler_yaml.py b/python/ray/tests/test_autoscaler_yaml.py
index 8d31fc076..6f70bba70 100644
--- a/python/ray/tests/test_autoscaler_yaml.py
+++ b/python/ray/tests/test_autoscaler_yaml.py
@@ -23,8 +23,10 @@ CONFIG_PATHS += recursive_fnmatch(
 class AutoscalingConfigTest(unittest.TestCase):
     def testValidateDefaultConfig(self):
         for config_path in CONFIG_PATHS:
-            if "aws/example-multi-node-type.yaml" in config_path:
-                # This is tested in testValidateDefaultConfigAWSMultiNodeTypes.
+            if ("aws/example-multi-node-type.yaml" in config_path
+                    or "staroid/example-multi-node-type.yaml" in config_path):
+                # aws is tested in testValidateDefaultConfigAWSMultiNodeTypes.
+                # staroid fails as it requires an installation of staroid.
                 continue
             with open(config_path) as f:
                 config = yaml.safe_load(f)