Arik Hadas has submitted this change and it was merged. Change subject: core: minimize access to database during vm analysis ...................................................................... core: minimize access to database during vm analysis VM fetchers provide 3 types of pairs to VmAnalyzer: 1. pair of reported VM from VDSM and VM from database 2. pair of VM from database and NULL 3. pair of VM from VDSM and NULL 1) means that the VM is 'stable', that is it is reported from the host that it is expected to run on. 2) means that the VM disappeared, that is no longer reported from the host that it is expected to run on. 3) means that the VM is reported from host that the VM was not running on. To resolve these cases the fetchers get the reported VM from VDSM and the ones in the database that are running on the monitored host. In case of #3, VmAnalyzer needs to query the database again. This patch queries the VM from the database, if needed, in the factory of VmAnalyzer. That way, we reduce the access to the database inside VmAnalyzer and replace unclear null-checks with more declarative checks. Change-Id: I5d6b83c4f4a2d8ee6d1bb3f7f69bebeeec0675cb Signed-off-by: Arik Hadas <ahadas(a)redhat.com&gt; --- M backend/manager/modules/vdsbroker/src/main/java/org/ovirt/engine/core/vdsbroker/monitoring/VmAnalyzer.java M backend/manager/modules/vdsbroker/src/main/java/org/ovirt/engine/core/vdsbroker/monitoring/VmAnalyzerFactory.java M backend/manager/modules/vdsbroker/src/main/java/org/ovirt/engine/core/vdsbroker/monitoring/VmsMonitoring.java M backend/manager/modules/vdsbroker/src/test/java/org/ovirt/engine/core/vdsbroker/monitoring/VmAnalyzerTest.java M backend/manager/modules/vdsbroker/src/test/java/org/ovirt/engine/core/vdsbroker/monitoring/VmTestPairs.java 5 files changed, 25 insertions(+), 83 deletions(-) Approvals: Shahar Havivi: Looks good to me, approved Jenkins CI: Passed CI tests Arik Hadas: Verified -- To view, visit https://gerrit.ovirt.org/56566 To unsubscribe, visit https://gerrit.ovirt.org/settings Gerrit-MessageType: merged Gerrit-Change-Id: I5d6b83c4f4a2d8ee6d1bb3f7f69bebeeec0675cb Gerrit-PatchSet: 5 Gerrit-Project: ovirt-engine Gerrit-Branch: master Gerrit-Owner: Arik Hadas <ahadas(a)redhat.com&gt; Gerrit-Reviewer: Arik Hadas <ahadas(a)redhat.com&gt; Gerrit-Reviewer: Jenkins CI Gerrit-Reviewer: Shahar Havivi <shavivi(a)redhat.com&gt; Gerrit-Reviewer: gerrit-hooks <automation(a)ovirt.org&gt;