зеркало из https://github.com/github/vitess-gh.git
296 строки
9.2 KiB
Python
Executable File
296 строки
9.2 KiB
Python
Executable File
#!/usr/bin/env python
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import logging
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import unittest
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import MySQLdb
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import environment
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import tablet
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import utils
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use_mysqlctld = True
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tablet_master = tablet.Tablet(use_mysqlctld=use_mysqlctld)
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tablet_replica1 = tablet.Tablet(use_mysqlctld=use_mysqlctld)
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tablet_replica2 = tablet.Tablet(use_mysqlctld=use_mysqlctld)
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setup_procs = []
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def setUpModule():
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try:
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environment.topo_server().setup()
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# start mysql instance external to the test
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global setup_procs
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setup_procs = [
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tablet_master.init_mysql(),
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tablet_replica1.init_mysql(),
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tablet_replica2.init_mysql(),
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]
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if use_mysqlctld:
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tablet_master.wait_for_mysqlctl_socket()
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tablet_replica1.wait_for_mysqlctl_socket()
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tablet_replica2.wait_for_mysqlctl_socket()
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else:
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utils.wait_procs(setup_procs)
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except:
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tearDownModule()
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raise
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def tearDownModule():
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utils.required_teardown()
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if utils.options.skip_teardown:
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return
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if use_mysqlctld:
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# Try to terminate mysqlctld gracefully, so it kills its mysqld.
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for proc in setup_procs:
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utils.kill_sub_process(proc, soft=True)
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teardown_procs = setup_procs
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else:
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teardown_procs = [
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tablet_master.teardown_mysql(),
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tablet_replica1.teardown_mysql(),
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tablet_replica2.teardown_mysql(),
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]
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utils.wait_procs(teardown_procs, raise_on_error=False)
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environment.topo_server().teardown()
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utils.kill_sub_processes()
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utils.remove_tmp_files()
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tablet_master.remove_tree()
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tablet_replica1.remove_tree()
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tablet_replica2.remove_tree()
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class TestBackup(unittest.TestCase):
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def setUp(self):
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for t in tablet_master, tablet_replica1:
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t.create_db('vt_test_keyspace')
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tablet_master.init_tablet('master', 'test_keyspace', '0', start=True,
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supports_backups=True)
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tablet_replica1.init_tablet('replica', 'test_keyspace', '0', start=True,
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supports_backups=True)
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utils.run_vtctl(['InitShardMaster', 'test_keyspace/0',
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tablet_master.tablet_alias])
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def tearDown(self):
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for t in tablet_master, tablet_replica1:
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t.kill_vttablet()
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tablet.Tablet.check_vttablet_count()
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environment.topo_server().wipe()
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for t in [tablet_master, tablet_replica1, tablet_replica2]:
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t.reset_replication()
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t.set_semi_sync_enabled(master=False)
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t.clean_dbs()
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for backup in self._list_backups():
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self._remove_backup(backup)
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_create_vt_insert_test = '''create table vt_insert_test (
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id bigint auto_increment,
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msg varchar(64),
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primary key (id)
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) Engine=InnoDB'''
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def _insert_data(self, t, index):
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"""Add a single row with value 'index' to the given tablet."""
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t.mquery(
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'vt_test_keyspace',
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"insert into vt_insert_test (msg) values ('test %s')" %
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index, write=True)
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def _check_data(self, t, count, msg):
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"""Check that the specified tablet has the expected number of rows."""
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timeout = 10
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while True:
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try:
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result = t.mquery(
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'vt_test_keyspace', 'select count(*) from vt_insert_test')
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if result[0][0] == count:
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break
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except MySQLdb.DatabaseError:
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# ignore exceptions, we'll just timeout (the tablet creation
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# can take some time to replicate, and we get a 'table vt_insert_test
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# does not exist exception in some rare cases)
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logging.exception('exception waiting for data to replicate')
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timeout = utils.wait_step(msg, timeout)
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def _restore(self, t):
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"""Erase mysql/tablet dir, then start tablet with restore enabled."""
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self._reset_tablet_dir(t)
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t.start_vttablet(wait_for_state='SERVING',
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init_tablet_type='replica',
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init_keyspace='test_keyspace',
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init_shard='0',
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supports_backups=True)
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def _reset_tablet_dir(self, t):
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"""Stop mysql, delete everything including tablet dir, restart mysql."""
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utils.wait_procs([t.teardown_mysql()])
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t.remove_tree()
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proc = t.init_mysql()
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if use_mysqlctld:
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t.wait_for_mysqlctl_socket()
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else:
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utils.wait_procs([proc])
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def _list_backups(self):
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"""Get a list of backup names for the test shard."""
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backups, _ = utils.run_vtctl(tablet.get_backup_storage_flags() +
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['ListBackups', 'test_keyspace/0'],
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mode=utils.VTCTL_VTCTL, trap_output=True)
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return backups.splitlines()
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def _remove_backup(self, backup):
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"""Remove a named backup from the test shard."""
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utils.run_vtctl(
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tablet.get_backup_storage_flags() +
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['RemoveBackup', 'test_keyspace/0', backup],
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auto_log=True, mode=utils.VTCTL_VTCTL)
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def test_backup(self):
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"""Test backup flow.
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test_backup will:
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- create a shard with master and replica1 only
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- run InitShardMaster
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- insert some data
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- take a backup
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- insert more data on the master
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- bring up tablet_replica2 after the fact, let it restore the backup
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- check all data is right (before+after backup data)
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- list the backup, remove it
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"""
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# insert data on master, wait for slave to get it
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tablet_master.mquery('vt_test_keyspace', self._create_vt_insert_test)
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self._insert_data(tablet_master, 1)
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self._check_data(tablet_replica1, 1, 'replica1 tablet getting data')
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# backup the slave
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utils.run_vtctl(['Backup', tablet_replica1.tablet_alias], auto_log=True)
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# insert more data on the master
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self._insert_data(tablet_master, 2)
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# now bring up the other slave, letting it restore from backup.
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self._restore(tablet_replica2)
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# check the new slave has the data
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self._check_data(tablet_replica2, 2, 'replica2 tablet getting data')
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# check that the backup shows up in the listing
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backups = self._list_backups()
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logging.debug('list of backups: %s', backups)
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self.assertEqual(len(backups), 1)
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self.assertTrue(backups[0].endswith(tablet_replica1.tablet_alias))
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# remove the backup and check that the list is empty
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self._remove_backup(backups[0])
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backups = self._list_backups()
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logging.debug('list of backups after remove: %s', backups)
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self.assertEqual(len(backups), 0)
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tablet_replica2.kill_vttablet()
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def test_master_slave_same_backup(self):
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"""Test a master and slave from the same backup.
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Check that a slave and master both restored from the same backup
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can replicate successfully.
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"""
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# insert data on master, wait for slave to get it
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tablet_master.mquery('vt_test_keyspace', self._create_vt_insert_test)
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self._insert_data(tablet_master, 1)
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self._check_data(tablet_replica1, 1, 'replica1 tablet getting data')
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# backup the slave
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utils.run_vtctl(['Backup', tablet_replica1.tablet_alias], auto_log=True)
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# insert more data on the master
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self._insert_data(tablet_master, 2)
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# now bring up the other slave, letting it restore from backup.
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self._restore(tablet_replica2)
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# check the new slave has the data
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self._check_data(tablet_replica2, 2, 'replica2 tablet getting data')
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# Promote replica2 to master.
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utils.run_vtctl(['PlannedReparentShard', 'test_keyspace/0',
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tablet_replica2.tablet_alias])
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# insert more data on replica2 (current master)
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self._insert_data(tablet_replica2, 3)
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# Force replica1 to restore from backup.
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tablet_replica1.kill_vttablet()
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self._restore(tablet_replica1)
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# wait for replica1 to catch up.
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self._check_data(tablet_replica1, 3,
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'replica1 getting data from restored master')
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tablet_replica2.kill_vttablet()
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def _restore_old_master_test(self, restore_method):
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"""Test that a former master replicates correctly after being restored.
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- Take a backup.
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- Reparent from old master to new master.
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- Force old master to restore from a previous backup using restore_method.
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Args:
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restore_method: function accepting one parameter of type tablet.Tablet,
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this function is called to force a restore on the provided tablet
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"""
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# insert data on master, wait for slave to get it
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tablet_master.mquery('vt_test_keyspace', self._create_vt_insert_test)
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self._insert_data(tablet_master, 1)
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self._check_data(tablet_replica1, 1, 'replica1 tablet getting data')
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# backup the slave
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utils.run_vtctl(['Backup', tablet_replica1.tablet_alias], auto_log=True)
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# insert more data on the master
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self._insert_data(tablet_master, 2)
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# reparent to replica1
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utils.run_vtctl(['PlannedReparentShard', 'test_keyspace/0',
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tablet_replica1.tablet_alias])
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# insert more data on new master
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self._insert_data(tablet_replica1, 3)
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# force the old master to restore at the latest backup.
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restore_method(tablet_master)
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# wait for it to catch up.
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self._check_data(tablet_master, 3, 'former master catches up after restore')
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def test_restore_old_master(self):
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def _restore_using_kill(t):
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t.kill_vttablet()
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self._restore(t)
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self._restore_old_master_test(_restore_using_kill)
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def test_in_place_restore(self):
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def _restore_in_place(t):
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utils.run_vtctl(['RestoreFromBackup', t.tablet_alias], auto_log=True)
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self._restore_old_master_test(_restore_in_place)
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if __name__ == '__main__':
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utils.main()
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