Merge "Handle "no RAM info was set" migration case" into stable/yoga

Author: Zuul

nova/tests/unit/virt/libvirt/test_guest.py

@@ -1040,3 +1040,25 @@ def test_job_info_operation_invalid(self, mock_stats, mock_info):
 
         mock_stats.assert_called_once_with()
         mock_info.assert_called_once_with()
+
+    @mock.patch.object(fakelibvirt.virDomain, "jobInfo")
+    @mock.patch.object(fakelibvirt.virDomain, "jobStats")
+    def test_job_stats_no_ram(self, mock_stats, mock_info):
+        mock_stats.side_effect = fakelibvirt.make_libvirtError(
+            fakelibvirt.libvirtError,
+            "internal error: migration was active, but no RAM info was set",
+            error_code=fakelibvirt.VIR_ERR_INTERNAL_ERROR,
+            error_message="migration was active, but no RAM info was set")
+
+        info = self.guest.get_job_info()
+
+        self.assertIsInstance(info, libvirt_guest.JobInfo)
+        self.assertEqual(fakelibvirt.VIR_DOMAIN_JOB_NONE, info.type)
+        self.assertEqual(0, info.time_elapsed)
+        self.assertEqual(0, info.time_remaining)
+        self.assertEqual(0, info.memory_total)
+        self.assertEqual(0, info.memory_processed)
+        self.assertEqual(0, info.memory_remaining)
+
+        mock_stats.assert_called_once_with()
+        self.assertFalse(mock_info.called)

nova/virt/libvirt/guest.py

@@ -655,6 +655,7 @@ def get_job_info(self):
                 stats = self._domain.jobStats()
                 return JobInfo(**stats)
             except libvirt.libvirtError as ex:
+                errmsg = ex.get_error_message()
                 if ex.get_error_code() == libvirt.VIR_ERR_NO_SUPPORT:
                     # Remote libvirt doesn't support new API
                     LOG.debug("Missing remote virDomainGetJobStats: %s", ex)
@@ -667,6 +668,12 @@ def get_job_info(self):
                     # away completclsely
                     LOG.debug("Domain has shutdown/gone away: %s", ex)
                     return JobInfo(type=libvirt.VIR_DOMAIN_JOB_COMPLETED)
+                elif (ex.get_error_code() == libvirt.VIR_ERR_INTERNAL_ERROR and
+                      errmsg and "migration was active, "
+                      "but no RAM info was set" in errmsg):
+                    LOG.debug("Migration is active or completed but "
+                              "virDomainGetJobStats is missing ram: %s", ex)
+                    return JobInfo(type=libvirt.VIR_DOMAIN_JOB_NONE)
                 else:
                     LOG.debug("Failed to get job stats: %s", ex)
                     raise

releasenotes/notes/bug-1982284-libvirt-handle-no-ram-info-was-set-99784934ed80fd72.yaml

@@ -0,0 +1,11 @@
+---
+other:
+  - |
+    A workaround has been added to the libvirt driver to catch and pass
+    migrations that were previously failing with the error:
+
+    ``libvirt.libvirtError: internal error: migration was active, but no RAM info was set``
+
+    See `bug 1982284`_ for more details.
+
+    .. _bug 1982284: https://bugs.launchpad.net/nova/+bug/1982284