[OVSDB-388] Clustering : In 3 node cluster, logout the OWNER node in karaf log, throws CandidateAlreadyRegisteredException Created: 20/Dec/16  Updated: 19/Oct/17

Status: Open
Project: ovsdb
Component/s: Clustering
Affects Version/s: unspecified
Fix Version/s: None

Type: Bug
Reporter: ranjithkumar_t Assignee: Unassigned
Resolution: Unresolved Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified
Environment:

Operating System: All
Platform: All

Attachments: Text File Entity Owners.txt     Zip Archive karaf logs.zip    
External issue ID: 7410

 Description   

ODL Version : distribution-karaf-0.5.2-Boron-SR2

Openstack Version : mitaka

Setup Details : 3 ODL Nodes + 1 Control Node + 2 Compute Nodes

Steps to Reproduce:
1. Start karaf and install odl-ovsdb-openstack and jolokia bundle
2. Check cluster is formed. And check network topology is initiated
3. Check the entity owner list and confirm the "OWNER" node (say member-2).
4. Logout the "OWNER" node and verify the entity owner previous owner will be removed and new owner node will be assigned.
5. In the remaining two nodes (say member-1 and member-3) "CandidateAlreadyRegisteredException" is been observed in the karaf logs.

Observation:

When "Owner" node goes down, one of the remaining two nodes act as "MASTER" and other as "SLAVE". Only at this time "CandidateAlreadyRegisteredException" is been observed. The exception is not observed when ODLs are not connect with OVS. Only when it is connected OVS, the exception is reproduced.

karaf.log:1755:org.opendaylight.controller.md.sal.common.api.clustering.CandidateAlreadyRegisteredException: Candidate has already been registered for Entity{type='ovsdb', id=/(urn:TBD:params:xml:ns:yang:network-topology?revision=2013-10-21)network-topology/topology/topology[

{(urn:TBD:params:xml:ns:yang:network-topology?revision=2013-10-21)topology-id=ovsdb:1}

]/node/node[

{(urn:TBD:params:xml:ns:yang:network-topology?revision=2013-10-21)node-id=ovsdb://uuid/24e237d2-70d7-4e10-9d50-2dd4a680f70a}

]}
karaf.log:1768:org.opendaylight.controller.md.sal.common.api.clustering.CandidateAlreadyRegisteredException: Candidate has already been registered for Entity{type='ovsdb', id=/(urn:TBD:params:xml:ns:yang:network-topology?revision=2013-10-21)network-topology/topology/topology[

{(urn:TBD:params:xml:ns:yang:network-topology?revision=2013-10-21)topology-id=ovsdb:1}

]/node/node[

{(urn:TBD:params:xml:ns:yang:network-topology?revision=2013-10-21)node-id=ovsdb://uuid/edc5f467-d8e8-469a-b451-83e832f43bb9}

]}
karaf.log:1781:org.opendaylight.controller.md.sal.common.api.clustering.CandidateAlreadyRegisteredException: Candidate has already been registered for Entity{type='ovsdb', id=/(urn:TBD:params:xml:ns:yang:network-topology?revision=2013-10-21)network-topology/topology/topology[

{(urn:TBD:params:xml:ns:yang:network-topology?revision=2013-10-21)topology-id=ovsdb:1}

]/node/node[

{(urn:TBD:params:xml:ns:yang:network-topology?revision=2013-10-21)node-id=ovsdb://uuid/fa6ea16b-52dd-4366-883d-2d2ed3e26834}

]}

Note:
24e237d2-70d7-4e10-9d50-2dd4a680f70a – Control Node UUID
fa6ea16b-52dd-4366-883d-2d2ed3e26834 – Compute Node1 UUID
edc5f467-d8e8-469a-b451-83e832f43bb9 – Compute Node2 UUID

The above exception will not affect any functionality.

Please find the attached files for karaf logs and entity owner details.

 Comments   
Comment by ranjithkumar_t [ 20/Dec/16 ]

Attachment karaf logs.zip has been added with description: karaf logs for your reference

Comment by ranjithkumar_t [ 20/Dec/16 ]

Attachment Entity Owners.txt has been added with description: Entity owner details once owner node is down

Comment by Tom Pantelis [ 21/Dec/16 ]

Was this bug filed in clustering b/c the EOS is possibly incorrectly reporting CandidateAlreadyRegisteredException? If not then this looks like an issue in the application code (i.e. attempting to re-register an existing candidate), not in the EOS, and this bug should be moved elsewhere.

Comment by Robert Varga [ 12/Apr/17 ]

Assigning to ovsdb to check things on their end.

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