explict wsrep_sst_donor fails when node doesn't exist with un-intuitive error message

[grooverdan]

I updating to mariadb-galera-5.5.39 and came across the following error.

Sep 5 09:58:59 db-prod-iin-galera3 mysqld: 140905 9:58:59 [Note] WSREP: Prepared IST receiver, listening at: tcp://10.1.2.113:4568
Sep 5 09:58:59 db-prod-iin-galera3 mysqld: 140905 9:58:59 [ERROR] WSREP: Requesting state transfer failed: -113(No route to host)
Sep 5 09:58:59 db-prod-iin-galera3 mysqld: 140905 9:58:59 [ERROR] WSREP: State transfer request failed unrecoverably: 113 (No route to host). Most likely it is due to inability to communicate with the cluster primary component. Restart required.
Sep 5 09:58:59 db-prod-iin-galera3 mysqld: 140905 9:58:59 [Note] WSREP: Closing send monitor...

After much examination and strace-ing of mysqld on this instance and the donor neither side reported EHOSTUNREACH (wsrep_sst_donor='db-prod--iin-rep1' was specified).

bug 1: miss leading error messages

returning EHOSTUNREACH in ./gcs/src/gcs_group.cpp:group_find_node_by_name - can an explicit gu_info/gu_error message be called within that function that describes the message that node db-prod--iin-rep1 could not be found.

(And for this Arjen ranted http://openquery.com.au/blog/tracing-problem-finding-sloppy-code )

bug 1a:

http://galeracluster.com/documentation-webpages/mysqlwsrepoptions.html#wsrep-sst-donor
-11(Resource temporarily unavailable) (does this still apply?). -EHOSTDOWN, gcs_group_act_conf (-ENOMEM) are also bizarrely cryptic.

[grooverdan]

https://mariadb.atlassian.net/browse/MDEV-6699

of donor.

| Variable_name | Value |
| hostname | db-prod--iin-rep1 |
| wsrep_node_name | |
| innodb_version | 5.5.38-MariaDB-35.2 |
| version | 5.5.39-MariaDB-1~precise-wsrep-log |
| version_comment | mariadb.org binary distribution, wsrep_25.10.r4014 |

db-prod-iin-galera3 also 5.5.39-MariaDB-1~precise-wsrep-log

[ottok]

+1

It took me a while to debug this error message. I had defined wsrep-sst-donor by IP address, and after seeing that error message I did all sort of network debugging until I noticed that the donor must be specified by node name as defined in the wsrep_node_name parameter.

[grooverdan]

#109 contains a fix. I wrote it to be minimal however if something different is required just ask.

[zz9pzza]

Can I +1 to this being fixed sooner rather than later ( If it helps I can reference a mariadb.com support ticket ).