80 lines
3.3 KiB
Python
80 lines
3.3 KiB
Python
# Copyright 2014 Tesora, Inc.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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#
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from oslo_log import log as logging
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from trove.common import exception
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from trove.common.i18n import _
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from trove.guestagent.backup.backupagent import BackupAgent
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from trove.guestagent.common import operating_system
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from trove.guestagent.common.operating_system import FileMode
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from trove.guestagent.datastore.mysql.service import MySqlApp
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from trove.guestagent.strategies.replication import mysql_base
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AGENT = BackupAgent()
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LOG = logging.getLogger(__name__)
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class MysqlGTIDReplication(mysql_base.MysqlReplicationBase):
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"""MySql Replication coordinated by GTIDs."""
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class UnableToDetermineLastMasterGTID(exception.TroveError):
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message = _("Unable to determine last GTID executed on master "
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"(from file %(binlog_file)s).")
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def connect_to_master(self, service, snapshot):
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if 'dataset' in snapshot:
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# pull the last executed GTID from the master via
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# the xtrabackup metadata file. If that value is
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# provided we need to set the gtid_purged variable
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# before executing the CHANGE MASTER TO command
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last_gtid = self._read_last_master_gtid()
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if last_gtid:
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set_gtid_cmd = "SET GLOBAL gtid_purged='%s'" % last_gtid
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service.execute_on_client(set_gtid_cmd)
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logging_config = snapshot['log_position']
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LOG.debug("connect_to_master %s", logging_config['replication_user'])
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change_master_cmd = (
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"CHANGE MASTER TO MASTER_HOST='%(host)s', "
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"MASTER_PORT=%(port)s, "
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"MASTER_USER='%(user)s', "
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"MASTER_PASSWORD='%(password)s', "
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"MASTER_AUTO_POSITION=1, "
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"MASTER_CONNECT_RETRY=15" %
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{
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'host': snapshot['master']['host'],
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'port': snapshot['master']['port'],
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'user': logging_config['replication_user']['name'],
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'password': logging_config['replication_user']['password']
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})
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service.execute_on_client(change_master_cmd)
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service.start_slave()
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def _read_last_master_gtid(self):
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INFO_FILE = ('%s/xtrabackup_binlog_info' % MySqlApp.get_data_dir())
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LOG.info(_("Setting read permissions on %s"), INFO_FILE)
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operating_system.chmod(INFO_FILE, FileMode.ADD_READ_ALL, as_root=True)
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LOG.info(_("Reading last master GTID from %s"), INFO_FILE)
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try:
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with open(INFO_FILE, 'rb') as f:
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row = f.read().split('\t')
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return row[2]
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except (IOError, IndexError) as ex:
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LOG.exception(ex)
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raise self.UnableToDetermineLastMasterGTID(
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{'binlog_file': INFO_FILE})
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