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Bug 1067028

Summary: CPG membership may be inconsistent after node pause
Product: Red Hat Enterprise Linux 7 Reporter: Jan Friesse <jfriesse>
Component: corosyncAssignee: Jan Friesse <jfriesse>
Status: CLOSED CURRENTRELEASE QA Contact: Cluster QE <mspqa-list>
Severity: urgent Docs Contact:
Priority: urgent    
Version: 7.0CC: ccaulfie, cluster-maint, fdinitto, jkortus
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: corosync-2.3.3-2.el7 Doc Type: Bug Fix
Doc Text:
Cause: Corosync on one of node is paused. On other nodes, cpg clients are killed. Consequence: Corosync on paused node after resume never finds out that on other nodes cpg clients were killed and still believes they are alive. Membership (cpg one) is different between nodes. Fix: Make sure that corosync properly updates it's internal informations about other nodes cpg clients. Result: Killed cpg clients are properly removed from internal structures so cpg membership is equivalent between nodes.
 Story Points: ---
Clone Of:
: 1067043 (view as bug list) Environment:
Last Closed: 2014-06-13 12:27:43 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Attachments:
Description Flags
Proposed patch - part 1 - cpg: Refactor mh_req_exec_cpg_procleave
none
Proposed patch - part 2 - cpg: Make sure nodid is always logged as hex num
none
Proposed patch - part3 - cpg: Make sure left nodes are really removed none

Description Jan Friesse 2014-02-19 14:25:23 UTC 
Description of problem:
When node is paused and other nodes has in meantime exited cpg process,
paused node after resume doesn't update it's membership correctly so on
previously paused node exited cpg process is still visible.

Version-Release number of selected component (if applicable):
Any

How reproducible:
100%

Steps to Reproduce:
1. Start 3 nodes and on every node execute cpg client (for example testcpg)
2. Pause one of node
3. On another node, stop and execute cpg client again
4. Unpause paused node
5. On paused node membership will be different then on other nodes (probe by corosync-cpgtool). Paused node will have 4 members (2 will be from node where cpg client was stopped and executed), other nodes will have 3 members (each node has exactly one client)

Actual results:
Membership contains non-existing process

Expected results:
Membership contains only existing processes

Additional info:
Comment 1 Jan Friesse 2014-02-19 14:27:10 UTC 
Created attachment 865089 [details]
Proposed patch - part 1 - cpg: Refactor mh_req_exec_cpg_procleave
Comment 2 Jan Friesse 2014-02-19 14:28:45 UTC 
Created attachment 865090 [details]
Proposed patch - part 2 - cpg: Make sure nodid is always logged as hex num
Comment 3 Jan Friesse 2014-02-19 14:29:15 UTC 
Created attachment 865091 [details]
Proposed patch - part3 - cpg: Make sure left nodes are really removed
Comment 9 Ludek Smid 2014-06-13 12:27:43 UTC 
This request was resolved in Red Hat Enterprise Linux 7.0.

Contact your manager or support representative in case you have further questions about the request.