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Did you try to delete zuul git cache /var/lib/zuul/git/  ?

From: Wan, Sam [mailto:Sam.Wan at emc.com]
Sent: Wednesday, February 10, 2016 9:27 AM
To: OpenStack Infra <openstack-infra at lists.openstack.org>
Subject: [OpenStack-Infra] weird 'Merge Failed.' message commented by zuul

Dear all,

   One of our CI ran into a weird issue.
   Yesterday, this CI commented 'Merge Failed.' message about every 20 mins automatically on patches despite there's no merge conflict in code.
   eg: https://review.openstack.org/#/c/272760/
   ---
EMC XIO CI
Patch Set 4: Merge Failed. This change was unable to be automatically merged with the current state of the repository. Please rebase your change and upload a new patchset.
Feb 9 5:27 AM
↩

Patch Set 4:

Merge Failed.

This change was unable to be automatically merged with the current state of the repository. Please rebase your change and upload a new patchset.
EMC XIO CI
Patch Set 4: Merge Failed. This change was unable to be automatically merged with the current state of the repository. Please rebase your change and upload a new patchset.
Feb 9 5:44 AM
↩

Patch Set 4:

Merge Failed.

This change was unable to be automatically merged with the current state of the repository. Please rebase your change and upload a new patchset.
EMC XIO CI
Patch Set 4: Merge Failed. This change was unable to be automatically merged with the current state of the repository. Please rebase your change and upload a new patchset.
Feb 9 6:02 AM
↩

Patch Set 4:

Merge Failed.

This change was unable to be automatically merged with the current state of the repository. Please rebase your change and upload a new patchset.
EMC XIO CI
Patch Set 4: Merge Failed. This change was unable to be automatically merged with the current state of the repository. Please rebase your change and upload a new patchset.
Feb 9 6:21 AM
↩

Patch Set 4:

Merge Failed.

This change was unable to be automatically merged with the current state of the repository. Please rebase your change and upload a new patchset.
EMC XIO CI
Patch Set 4: Merge Failed. This change was unable to be automatically merged with the current state of the repository. Please rebase your change and upload a new patchset.
Feb 9 6:40 AM
-----

 I've checked zuul debug.log and merger-debug.log but not found much errors related to this.
 The only error message I found is something like
---
ERROR zuul.GerritEventConnector: Received unrecognized event type 'ref-replication-done' from Gerrit.   Can not get account information.
ERROR zuul.GerritEventConnector: Received unrecognized event type 'ref-replicated' from Gerrit.     Can not get account information.
---
 What does above error mean？

 Could someone please shed some light on this issue？

 thanks and regards

Sam
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