mariadb bootstrap unconditionally check for wsrep cluster

[Serguei Bezverkhi]

On August 28th, 2016 this change c7c87909 introduced unconditional check for wsrep cluster during bootstrap process whether is ready or not and if it is not it, bootstrap fails.
In kubernetes environment wsrep driver is set to none, cluster will NEVER reach ready state hence causing mariadb bootstrap job failure in kubernetes.

This code should run ONLY for Kolla and never for Kolla Kubernetes

CLUSTER_READY=$(mysql -u root --exec="SHOW STATUS LIKE 'wsrep_cluster_status'" | grep Primary)
TIMEOUT=${DB_MAX_TIMEOUT:-60}
    while [[ -z "${CLUSTER_READY}" ]]; do
        if [[ ${TIMEOUT} -gt 0 ]]; then
            let TIMEOUT-=1
            sleep 1
        else
            exit 1

[Serguei Bezverkhi (sbezverk)]

In lubernetes we always get this:
()[mysql@mariadb-bootstrap-adlhn /]$ mysql -u root --exec="SHOW STATUS LIKE 'wsrep_cluster_status'"
+----------------------+--------------+
| Variable_name | Value |
+----------------------+--------------+
| wsrep_cluster_status | Disconnected |
+----------------------+--------------+
()[mysql@mariadb-bootstrap-adlhn /]$
()[mysql@mariadb-bootstrap-adlhn /]$ mysql -u root --exec="SHOW GLOBAL STATUS LIKE 'wsrep_%';"
+--------------------------+----------------------+
| Variable_name | Value |
+--------------------------+----------------------+
| wsrep_cluster_conf_id | 18446744073709551615 |
| wsrep_cluster_size | 0 |
| wsrep_cluster_state_uuid | |
| wsrep_cluster_status | Disconnected |
| wsrep_connected | OFF |
| wsrep_local_bf_aborts | 0 |
| wsrep_local_index | 18446744073709551615 |
| wsrep_provider_name | |
| wsrep_provider_vendor | |
| wsrep_provider_version | |
| wsrep_ready | ON |
| wsrep_thread_count | 0 |
+--------------------------+----------------------+

[Ryan Hallisey (rthall14)]

may be time for kolla-k8s to move to galera

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/370440

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/370440
Committed: https://git.openstack.org/cgit/openstack/kolla/commit/?id=cafdbb35d916fbc2ba59191f182ed946abd4cf2e
Submitter: Jenkins
Branch: master

commit cafdbb35d916fbc2ba59191f182ed946abd4cf2e
Author: Serguei Bezverkhi <email address hidden>
Date: Wed Sep 14 17:22:26 2016 -0400

    Mariadb bootstrap - no need to check for cluster ready in Kube

    The change c7c87909 has introduced an unconditional check
    for wsrep cluster during bootstrap process whether is ready or not
    and if it is not, bootstrap fails.
    In kubernetes environment wsrep driver is set to none, cluster will
    NEVER reach ready state hence causing kubernetes mariadb bootstrap job
    failure.

    Closes-Bug: #1623662

    Change-Id: I0e6fc098861b7eeab544229d0b04a78fa498ddb9