Flaky Test: ghost online ddl

[rohit-nayak-ps]

Overview of the Issue

Seeing this often:

=== RUN   TestSchemaChange/successful_online_alter,_vtctl
I0412 20:22:56.818540   16544 vtctlclient_process.go:168] Executing vtctlclient with command: vtctlclient -server localhost:16006 ApplySchema -sql 
        ALTER TABLE vt_onlineddl_test_03
            ENGINE=InnoDB -ddl_strategy gh-ost ks
# Generated UUID (for debug purposes):
<de38838a_9bcc_11eb_9203_000d3a7d4d46>
    onlineddl_ghost_test.go:350: 
            Error Trace:    onlineddl_ghost_test.go:350
                                        onlineddl_ghost_test.go:326
                                        onlineddl_ghost_test.go:214
            Error:          "CREATE TABLE `vt_onlineddl_test_03` (
                              `id` bigint(20) NOT NULL,
                              `msg` varchar(64) DEFAULT NULL,
                              `non_online` int(10) unsigned NOT NULL,
                              PRIMARY KEY (`id`)
                            ) ENGINE=InnoDB DEFAULT CHARSET=utf8" does not contain "ghost_col"
            Test:           TestSchemaChange/successful_online_alter,_vtctl

[shlomi-noach]

My immediate thinking is that this is related to increased runtime on Actions servers, as the problem doesn't reproduce locally. Looking into it.

[shlomi-noach]

solved via #7847 . Was an issue of GitHub Actions DNS resolution.