Roy Golan has posted comments on this change.

Change subject: core: ensure unique unit for VirtIO_SCSI and SPAR_VSCSI disks
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Patch Set 3: Code-Review-1

(1 comment)

https://gerrit.ovirt.org/#/c/39471/3/backend/manager/modules/vdsbroker/src/main/java/org/ovirt/engine/core/vdsbroker/vdsbroker/HotPlugDiskVDSCommand.java
File 
backend/manager/modules/vdsbroker/src/main/java/org/ovirt/engine/core/vdsbroker/vdsbroker/HotPlugDiskVDSCommand.java:

Line 180:         });
Line 181:     }
Line 182: 
Line 183:     protected void lockVmWithWait() {
Line 184:         Map<String, Pair<String, String>> exsluciveLock =
that's a clear violation of the usage of engine lock mech. its for the 
provisioning/bll layer and not vds broker layer. 

we already have locking facilities for vms in vdsbroker, please don't add more. 

I can suggest:

1. simple locking, either mutex, map, you name it
2. VmManager lock - that will serialize all VDS actions on that VM - maybe too 
much, but way simple and less risky (not shared with BLL layer)

question: isn't it the VDSM job to know what index is in use and just auto 
assign? rather than the engine send the index?
Line 185:                 
Collections.singletonMap(getParameters().getVmId().toString(),
Line 186:                         new 
Pair<>(LockingGroup.VM_DISK_HOT_PLUG.toString(),
Line 187:                                 
VdcBllMessages.ACTION_TYPE_FAILED_OBJECT_LOCKED.toString()));
Line 188:         vmLock = new EngineLock(exsluciveLock, null);


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Gerrit-MessageType: comment
Gerrit-Change-Id: I5e621618e8891fca52b48bff437cc4c2a1f695db
Gerrit-PatchSet: 3
Gerrit-Project: ovirt-engine
Gerrit-Branch: master
Gerrit-Owner: Daniel Erez <de...@redhat.com>
Gerrit-Reviewer: Allon Mureinik <amure...@redhat.com>
Gerrit-Reviewer: Arik Hadas <aha...@redhat.com>
Gerrit-Reviewer: Daniel Erez <de...@redhat.com>
Gerrit-Reviewer: Liron Aravot <lara...@redhat.com>
Gerrit-Reviewer: Omer Frenkel <ofren...@redhat.com>
Gerrit-Reviewer: Roy Golan <rgo...@redhat.com>
Gerrit-Reviewer: Vitor de Lima <vdel...@redhat.com>
Gerrit-Reviewer: automat...@ovirt.org
Gerrit-Reviewer: oVirt Jenkins CI Server
Gerrit-HasComments: Yes
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