Tal Nisan has submitted this change and it was merged. Change subject: core: deadlock and related changes in domain monitoring/InitVdsOnUp ...................................................................... core: deadlock and related changes in domain monitoring/InitVdsOnUp The following patches fixes few issues related to the given bug: 1. Deadlock between domain failover process and InitVdsOnUp flows - Thread 1 (domain failover process) - runs within the event queue (a), attempts to call SetVdsStatus command that waits for lock on VdsManager.getLockObj() (b) Thread 2 - InitVdsOnUp - runs through the VdsManager.OnTimer with lock on VdsManager.getLockObj() (b) and waits for event submitted to the event queue to be executed (a) The implemented solution is to call SetVdsStatus executed from thread 1 on a new thread which will also reduce the wait time for the mutex. 2. Domain monitoring information should be processed from hosts that are "Up", if the host is not UP it means that something is wrong with that domain regardless (for example, if the host was moved to non-op status because of problematic report of domain, there's no reason to analyze each time its domain report). 3. Reduce calls to SetVdsStatus thus reducing acquired locks and wait time in case that the host isn't UP (if the host is already not up because of some other reason, there's no need to change it's status). Change-Id: I334b450fcf29ed57675ec1f2e4bf3bc43f31b4aa Bug-Url: https://bugzilla.redhat.com/965972 Signed-off-by: Liron Aravot <laravot(a)redhat.com&gt; --- M backend/manager/modules/vdsbroker/src/main/java/org/ovirt/engine/core/vdsbroker/VdsManager.java M backend/manager/modules/vdsbroker/src/main/java/org/ovirt/engine/core/vdsbroker/irsbroker/IrsBrokerCommand.java 2 files changed, 31 insertions(+), 21 deletions(-) Approvals: Tal Nisan: Verified; Looks good to me, approved -- To view, visit http://gerrit.ovirt.org/20400 To unsubscribe, visit http://gerrit.ovirt.org/settings Gerrit-MessageType: merged Gerrit-Change-Id: I334b450fcf29ed57675ec1f2e4bf3bc43f31b4aa Gerrit-PatchSet: 7 Gerrit-Project: ovirt-engine Gerrit-Branch: master Gerrit-Owner: Liron Ar <laravot(a)redhat.com&gt; Gerrit-Reviewer: Allon Mureinik <amureini(a)redhat.com&gt; Gerrit-Reviewer: Ayal Baron <abaron(a)redhat.com&gt; Gerrit-Reviewer: Liron Ar <laravot(a)redhat.com&gt; Gerrit-Reviewer: Maor Lipchuk <mlipchuk(a)redhat.com&gt; Gerrit-Reviewer: Roy Golan <rgolan(a)redhat.com&gt; Gerrit-Reviewer: Sergey Gotliv <sgotliv(a)redhat.com&gt; Gerrit-Reviewer: Tal Nisan <tnisan(a)redhat.com&gt; Gerrit-Reviewer: oVirt Jenkins CI Server