Oved Ourfali has submitted this change and it was merged. Change subject: core: SyncLunsInfo - avoidable executions/db deadlock ...................................................................... core: SyncLunsInfo - avoidable executions/db deadlock Currently SyncLunsInfoForBlockStorageDomainCommand is being executed when connecting to a domain storage server. This command is resposible to check if any of the luns of the domain were changed and in case it did, update the DB accordingly. When a storage domain is being activated all of it's hosts are being connected simoltenously to the domain, which leads that SyncLunsInfoForBlockStorageDomainCommand is executed multiple times (once for each host) which is unneeded as it's exactly the same as having response from one host (even if the responses of the hosts are different, we can't decide which response is correct). When being executed simoltenously, possibly concurrent updates from the different threads can be made - as the order of the updates isn't garuanteed, there's a chance for a deadlock. This patch solves it by executes the operation for only one hosts at a time, only in case of failure (which should be rare) the engine will attempt to sync the luns through a different host. Change-Id: I725964aa51ac38bf16d83cc498c5298720031632 Bug-Url: https://bugzilla.redhat.com/1115845 Signed-off-by: Liron Aravot <laravot(a)redhat.com&gt; --- M backend/manager/modules/bll/src/main/java/org/ovirt/engine/core/bll/storage/ActivateStorageDomainCommand.java M backend/manager/modules/bll/src/main/java/org/ovirt/engine/core/bll/storage/FCPStorageHelper.java M backend/manager/modules/bll/src/main/java/org/ovirt/engine/core/bll/storage/ISCSIStorageHelper.java M backend/manager/modules/bll/src/main/java/org/ovirt/engine/core/bll/storage/IStorageHelper.java M backend/manager/modules/bll/src/main/java/org/ovirt/engine/core/bll/storage/StorageHelperBase.java 5 files changed, 40 insertions(+), 15 deletions(-) Approvals: Daniel Erez: Verified Allon Mureinik: Looks good to me, approved -- To view, visit http://gerrit.ovirt.org/31274 To unsubscribe, visit http://gerrit.ovirt.org/settings Gerrit-MessageType: merged Gerrit-Change-Id: I725964aa51ac38bf16d83cc498c5298720031632 Gerrit-PatchSet: 4 Gerrit-Project: ovirt-engine Gerrit-Branch: ovirt-engine-3.5 Gerrit-Owner: Daniel Erez <derez(a)redhat.com&gt; Gerrit-Reviewer: Allon Mureinik <amureini(a)redhat.com&gt; Gerrit-Reviewer: Daniel Erez <derez(a)redhat.com&gt; Gerrit-Reviewer: Liron Aravot <laravot(a)redhat.com&gt; Gerrit-Reviewer: Oved Ourfali <oourfali(a)redhat.com&gt; Gerrit-Reviewer: automation(a)ovirt.org Gerrit-Reviewer: oVirt Jenkins CI Server