Change in ovirt-engine[ovirt-engine-3.6.0]: engine: Update command associated entities instantly
Tal Nisan has submitted this change and it was merged.
Change subject: engine: Update command associated entities instantly
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engine: Update command associated entities instantly
The command associated entities shouldn't be considered as
part of any command's transaction.
The root cause of this bug is a difference between the behavior of
postgres 8.4 and 9.1.
In the described scenarios (and other similar to this issue as we faced
on AddVmTemplate) we have the following sequence:
On The main thread:
Open new transaction (either explicit or as default command's scope):
CommandCoordinatorUtil.executeAsyncCommand(...)
|
+-- coco.persistCommandAssociatedEntities(...)
which internally updates command_assoc_entities table
On the submitted thread we calls:
CommandBase.setCommandStatus()
which updates the command_entities table.
The first update of 'command_assoc_entities' table is done on
transaction Tx1 a, which is open. While Tx1 is open, the update for
'command_entities' is executed in other transaction Tx2.
In postgres 9.1, that scenario is permitted without any locking on the
command_entities table.
However in postgres 8.4, an update for 'command_entities' isn't
permitted, unless the referred table 'command_assoc_entities' is closed.
In order to make the code compliant for both postgres versions, the
first update to 'command_assoc_entities' should be immediately
committed.
Change-Id: I50496b6bdf0627f74b9458967a52323d377cea7a
Bug-Url: https://bugzilla.redhat.com/1264691
Signed-off-by: Moti Asayag <masayag(a)redhat.com>
---
M
backend/manager/modules/bll/src/main/java/org/ovirt/engine/core/bll/tasks/CommandsCacheImpl.java
1 file changed, 8 insertions(+), 1 deletion(-)
Approvals:
Tal Nisan: Passed CI tests
Daniel Erez: Looks good to me, approved
Moti Asayag: Verified
--
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Gerrit-MessageType: merged
Gerrit-Change-Id: I50496b6bdf0627f74b9458967a52323d377cea7a
Gerrit-PatchSet: 2
Gerrit-Project: ovirt-engine
Gerrit-Branch: ovirt-engine-3.6.0
Gerrit-Owner: Moti Asayag <masayag(a)redhat.com>
Gerrit-Reviewer: Daniel Erez <derez(a)redhat.com>
Gerrit-Reviewer: Jenkins CI
Gerrit-Reviewer: Moti Asayag <masayag(a)redhat.com>
Gerrit-Reviewer: Tal Nisan <tnisan(a)redhat.com>
Gerrit-Reviewer: automation(a)ovirt.org