[AMBARI-26134]Resolve Test case failures in Ambari Metrics host Monit…

…oring

.github/workflows/ambari.yml

@@ -33,7 +33,11 @@ jobs:
         java-version: 8
         distribution: temurin
         cache: maven
-    - name: Set up Python 2
-      run: sudo apt-get update && sudo apt-get install -y python2-dev python-is-python2
+    - name: Set up Python 3
+      run: sudo apt-get update && sudo apt-get install -y python3-dev python3-pip python-is-python3
+    - name: Install Kerberos development libraries
+      run: sudo apt-get install -y libkrb5-dev
+    - name: Install Kerberos
+      run: pip3 install kerberos
     - name: Build with Maven
       run: mvn -B clean package

ambari-metrics-host-monitoring/src/main/python/core/emitter.py

@@ -21,10 +21,10 @@
 import logging
 import threading
 
-from resource_monitoring.core.security import CachedHTTPSConnection, CachedHTTPConnection
-from resource_monitoring.core.blacklisted_set import BlacklistedSet
-from resource_monitoring.core.config_reader import ROUND_ROBIN_FAILOVER_STRATEGY
-from resource_monitoring.core.spnego_kerberos_auth import SPNEGOKerberosAuth
+from security import CachedHTTPSConnection, CachedHTTPConnection
+from blacklisted_set import BlacklistedSet
+from config_reader import ROUND_ROBIN_FAILOVER_STRATEGY
+from spnego_kerberos_auth import SPNEGOKerberosAuth
 
 logger = logging.getLogger()
 

ambari-metrics-host-monitoring/src/main/python/core/host_info.py

@@ -120,6 +120,7 @@ def get_mem_info(self):
     swap_total = self.__host_static_info.get('swap_total')
 
     bytes2kilobytes = lambda x: x / 1024
+    mem_total = psutil.virtual_memory().total
 
     return {
       'mem_total': bytes2kilobytes(mem_total) if mem_total else 0,

ambari-metrics-host-monitoring/src/main/python/core/metering.py

@@ -21,7 +21,7 @@
 import logging
 import time
 import json
-from resource_monitoring.core.instance_type_provider import HostInstanceTypeProvider
+from instance_type_provider import HostInstanceTypeProvider
 
 logger = logging.getLogger()
 

ambari-metrics-host-monitoring/src/main/python/core/metric_collector.py

@@ -20,8 +20,8 @@
 
 import logging
 from time import time
-from resource_monitoring.core.event_definition import HostMetricCollectEvent, ProcessMetricCollectEvent
-from resource_monitoring.core.metering import MeteringMetricHandler
+from event_definition import HostMetricCollectEvent, ProcessMetricCollectEvent
+from metering import MeteringMetricHandler
 
 logger = logging.getLogger()
 

ambari-metrics-host-monitoring/src/main/python/core/spnego_kerberos_auth.py

@@ -26,7 +26,7 @@
 try:
   import kerberos
 except ImportError:
-  from resource_monitoring.core import krberr as kerberos
+  from krberr import krberr as kerberos
   logger.warn('import kerberos exception: %s' % str(ImportError))
 pass
 

ambari-metrics-host-monitoring/src/test/python/core/TestEmitter.py

@@ -21,6 +21,7 @@
 import json
 import logging
 import time
+import distro
 
 from unittest import TestCase
 from mock.mock import patch, MagicMock
@@ -30,7 +31,7 @@
 
 os_distro_value = ('Suse','11','Final')
 
-with patch("platform.linux_distribution", return_value = os_distro_value):
+with patch("distro.linux_distribution", return_value=os_distro_value):
   from application_metric_map import ApplicationMetricMap
   from config_reader import Configuration
   from emitter import Emitter

ambari-metrics-host-monitoring/src/test/python/core/TestHostInfo.py

@@ -71,21 +71,33 @@ def testMemInfo(self, vm_mock, sw_mock):
     vm.free = 2312043
     vm.shared = 1243
     vm.buffers = 23435
-    vm.cached = 23545
     vm.available = 2312043
+    vm.total = 8192 * 1024
+    vm.used = 4096 * 1024
+    vm.cached = 1024 * 1024
 
     sw = sw_mock.return_value
     sw.free = 2341234
+    sw.used = 1024 * 1024
+    sw.total = 2048 * 1024
+    sw.sin = 512 * 1024
+    sw.sout = 256 * 1024
 
     hostinfo = HostInfo(MagicMock())
 
     mem = hostinfo.get_mem_info()
 
-    self.assertAlmostEqual(mem['mem_free'], 2257)
-    self.assertAlmostEqual(mem['mem_shared'], 1)
-    self.assertAlmostEqual(mem['mem_buffered'], 22)
-    self.assertAlmostEqual(mem['mem_cached'], 22)
-    self.assertAlmostEqual(mem['swap_free'], 2286)
+    self.assertAlmostEqual(mem['mem_free'], 2257, delta = 1)
+    self.assertAlmostEqual(mem['mem_shared'], 1, delta=0.5)
+    self.assertAlmostEqual(mem['mem_buffered'], 22, delta = 1)
+    self.assertAlmostEqual(mem['mem_cached'], 1024, delta = 1)
+    self.assertAlmostEqual(mem['swap_free'], 2286, delta = 1)
+    self.assertAlmostEqual(mem['mem_total'], 8192, delta = 1)
+    self.assertAlmostEqual(mem['mem_used'], 3072, delta = 1)
+    self.assertAlmostEqual(mem['swap_used'], 1024, delta = 1)
+    self.assertAlmostEqual(mem['swap_total'], 2048, delta = 1)
+    self.assertAlmostEqual(mem['swap_in'], 512, delta = 1)
+    self.assertAlmostEqual(mem['swap_out'], 256, delta = 1)
 
 
   @patch("psutil.process_iter")

ambari-metrics-host-monitoring/src/test/python/mock/mock.py

@@ -31,6 +31,8 @@
 
 import pprint
 import sys
+import distro
+os_distro_value = distro.linux_distribution(full_distribution_name=False)
 
 try:
     import inspect