[core] Check if oozie is present in INSTALLED_APPS before importing Job model in config_validator (#4056)

Author: Harshg999

desktop/core/src/desktop/conf.py

@@ -2649,7 +2649,6 @@ def config_validator(user):
   from desktop.lib import i18n
   from desktop.models import Document, Document2  # Avoid cyclic loop
   from desktop.settings import DOCUMENT2_MAX_ENTRIES  # Avoid cyclic loop
-  from oozie.models import Job
 
   res = []
 
@@ -2678,10 +2677,14 @@ def config_validator(user):
     res.append(('SavedQuery_CLEANUP_WARNING', str(_('Saved Query has more than %d entries: %d, '
                 'please run "hue desktop_document_cleanup --cm-managed" to remove old entries' % (DOCUMENT2_MAX_ENTRIES, sq_count)))))
 
-  job_count = Job.objects.count()
-  if job_count > DOCUMENT2_MAX_ENTRIES:
-    res.append(('OOZIEJOB_CLEANUP_WARNING', str(_('Oozie Job has more than %d entries: %d, '
-                'please run "hue desktop_document_cleanup --cm-managed" to remove old entries' % (DOCUMENT2_MAX_ENTRIES, job_count)))))
+  # Check if oozie is enabled and present in INSTALLED_APPS
+  from desktop.settings import INSTALLED_APPS  # Avoid circular import
+  if 'oozie' in INSTALLED_APPS:
+    from oozie.models import Job
+    job_count = Job.objects.count()
+    if job_count > DOCUMENT2_MAX_ENTRIES:
+      res.append(('OOZIEJOB_CLEANUP_WARNING', str(_('Oozie Job has more than %d entries: %d, '
+                  'please run "hue desktop_document_cleanup --cm-managed" to remove old entries' % (DOCUMENT2_MAX_ENTRIES, job_count)))))
 
   if not get_secret_key():
     res.append((SECRET_KEY, str(_("Secret key should be configured as a random string. All sessions will be lost on restart"))))