#! /usr/bin/env python # Copyright (c) 2010-2012 OpenStack Foundation # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or # implied. # See the License for the specific language governing permissions and # limitations under the License. from array import array from errno import EEXIST from itertools import islice, izip from math import ceil from os import mkdir from os.path import basename, abspath, dirname, exists, join as pathjoin from sys import argv, exit, stderr from textwrap import wrap from time import time from swift.common import exceptions from swift.common.ring import RingBuilder, Ring from swift.common.ring.builder import MAX_BALANCE from swift.common.utils import lock_parent_directory from swift.common.ring.utils import parse_search_value, parse_args, \ build_dev_from_opts, parse_builder_ring_filename_args MAJOR_VERSION = 1 MINOR_VERSION = 3 EXIT_SUCCESS = 0 EXIT_WARNING = 1 EXIT_ERROR = 2 def format_device(dev): """ Format a device for display. """ copy_dev = dev.copy() for key in ('ip', 'replication_ip'): if ':' in copy_dev[key]: copy_dev[key] = '[' + copy_dev[key] + ']' return ('d%(id)sr%(region)sz%(zone)s-%(ip)s:%(port)sR' '%(replication_ip)s:%(replication_port)s/%(device)s_' '"%(meta)s"' % copy_dev) def _parse_add_values(argvish): """ Parse devices to add as specified on the command line. Will exit on error and spew warnings. :returns: array of device dicts """ opts, args = parse_args(argvish) # We'll either parse the all-in-one-string format or the --options format, # but not both. If both are specified, raise an error. opts_used = opts.region or opts.zone or opts.ip or opts.port or \ opts.device or opts.weight or opts.meta if len(args) > 0 and opts_used: print Commands.add.__doc__.strip() exit(EXIT_ERROR) elif len(args) > 0: if len(args) % 2 != 0: print Commands.add.__doc__.strip() exit(EXIT_ERROR) parsed_devs = [] devs_and_weights = izip(islice(args, 0, len(args), 2), islice(args, 1, len(args), 2)) for devstr, weightstr in devs_and_weights: region = 1 rest = devstr if devstr.startswith('r'): i = 1 while i < len(devstr) and devstr[i].isdigit(): i += 1 region = int(devstr[1:i]) rest = devstr[i:] else: stderr.write("WARNING: No region specified for %s. " "Defaulting to region 1.\n" % devstr) if not rest.startswith('z'): print 'Invalid add value: %s' % devstr exit(EXIT_ERROR) i = 1 while i < len(rest) and rest[i].isdigit(): i += 1 zone = int(rest[1:i]) rest = rest[i:] if not rest.startswith('-'): print 'Invalid add value: %s' % devstr print "The on-disk ring builder is unchanged.\n" exit(EXIT_ERROR) i = 1 if rest[i] == '[': i += 1 while i < len(rest) and rest[i] != ']': i += 1 i += 1 ip = rest[1:i].lstrip('[').rstrip(']') rest = rest[i:] else: while i < len(rest) and rest[i] in '0123456789.': i += 1 ip = rest[1:i] rest = rest[i:] if not rest.startswith(':'): print 'Invalid add value: %s' % devstr print "The on-disk ring builder is unchanged.\n" exit(EXIT_ERROR) i = 1 while i < len(rest) and rest[i].isdigit(): i += 1 port = int(rest[1:i]) rest = rest[i:] replication_ip = ip replication_port = port if rest.startswith('R'): i = 1 if rest[i] == '[': i += 1 while i < len(rest) and rest[i] != ']': i += 1 i += 1 replication_ip = rest[1:i].lstrip('[').rstrip(']') rest = rest[i:] else: while i < len(rest) and rest[i] in '0123456789.': i += 1 replication_ip = rest[1:i] rest = rest[i:] if not rest.startswith(':'): print 'Invalid add value: %s' % devstr print "The on-disk ring builder is unchanged.\n" exit(EXIT_ERROR) i = 1 while i < len(rest) and rest[i].isdigit(): i += 1 replication_port = int(rest[1:i]) rest = rest[i:] if not rest.startswith('/'): print 'Invalid add value: %s' % devstr print "The on-disk ring builder is unchanged.\n" exit(EXIT_ERROR) i = 1 while i < len(rest) and rest[i] != '_': i += 1 device_name = rest[1:i] rest = rest[i:] meta = '' if rest.startswith('_'): meta = rest[1:] try: weight = float(weightstr) except ValueError: print 'Invalid weight value: %s' % weightstr print "The on-disk ring builder is unchanged.\n" exit(EXIT_ERROR) if weight < 0: print 'Invalid weight value (must be positive): %s' % weightstr print "The on-disk ring builder is unchanged.\n" exit(EXIT_ERROR) parsed_devs.append({'region': region, 'zone': zone, 'ip': ip, 'port': port, 'device': device_name, 'replication_ip': replication_ip, 'replication_port': replication_port, 'weight': weight, 'meta': meta}) return parsed_devs else: try: dev = build_dev_from_opts(opts) except ValueError as e: print e print "The on-disk ring builder is unchanged.\n" exit(EXIT_ERROR) return [dev] class Commands: def unknown(): print 'Unknown command: %s' % argv[2] exit(EXIT_ERROR) def create(): """ swift-ring-builder create Creates with 2^ partitions and . is number of hours to restrict moving a partition more than once. """ if len(argv) < 6: print Commands.create.__doc__.strip() exit(EXIT_ERROR) builder = RingBuilder(int(argv[3]), float(argv[4]), int(argv[5])) backup_dir = pathjoin(dirname(argv[1]), 'backups') try: mkdir(backup_dir) except OSError as err: if err.errno != EEXIST: raise builder.save(pathjoin(backup_dir, '%d.' % time() + basename(argv[1]))) builder.save(argv[1]) exit(EXIT_SUCCESS) def default(): """ swift-ring-builder Shows information about the ring and the devices within. """ print '%s, build version %d' % (argv[1], builder.version) regions = 0 zones = 0 balance = 0 dev_count = 0 if builder.devs: regions = len(set(d['region'] for d in builder.devs if d is not None)) zones = len(set((d['region'], d['zone']) for d in builder.devs if d is not None)) dev_count = len([dev for dev in builder.devs if dev is not None]) balance = builder.get_balance() print '%d partitions, %.6f replicas, %d regions, %d zones, ' \ '%d devices, %.02f balance' % (builder.parts, builder.replicas, regions, zones, dev_count, balance) print 'The minimum number of hours before a partition can be ' \ 'reassigned is %s' % builder.min_part_hours if builder.devs: print 'Devices: id region zone ip address port ' \ 'replication ip replication port name ' \ 'weight partitions balance meta' weighted_parts = builder.parts * builder.replicas / \ sum(d['weight'] for d in builder.devs if d is not None) for dev in builder.devs: if dev is None: continue if not dev['weight']: if dev['parts']: balance = MAX_BALANCE else: balance = 0 else: balance = 100.0 * dev['parts'] / \ (dev['weight'] * weighted_parts) - 100.0 print(' %5d %7d %5d %15s %5d %15s %17d %9s %6.02f ' '%10s %7.02f %s' % (dev['id'], dev['region'], dev['zone'], dev['ip'], dev['port'], dev['replication_ip'], dev['replication_port'], dev['device'], dev['weight'], dev['parts'], balance, dev['meta'])) exit(EXIT_SUCCESS) def search(): """ swift-ring-builder search Shows information about matching devices. """ if len(argv) < 4: print Commands.search.__doc__.strip() print print parse_search_value.__doc__.strip() exit(EXIT_ERROR) devs = builder.search_devs(parse_search_value(argv[3])) if not devs: print 'No matching devices found' exit(EXIT_ERROR) print 'Devices: id region zone ip address port ' \ 'replication ip replication port name weight partitions ' \ 'balance meta' weighted_parts = builder.parts * builder.replicas / \ sum(d['weight'] for d in builder.devs if d is not None) for dev in devs: if not dev['weight']: if dev['parts']: balance = MAX_BALANCE else: balance = 0 else: balance = 100.0 * dev['parts'] / \ (dev['weight'] * weighted_parts) - 100.0 print(' %5d %7d %5d %15s %5d %15s %17d %9s %6.02f %10s ' '%7.02f %s' % (dev['id'], dev['region'], dev['zone'], dev['ip'], dev['port'], dev['replication_ip'], dev['replication_port'], dev['device'], dev['weight'], dev['parts'], balance, dev['meta'])) exit(EXIT_SUCCESS) def list_parts(): """ swift-ring-builder list_parts [] .. Returns a 2 column list of all the partitions that are assigned to any of the devices matching the search values given. The first column is the assigned partition number and the second column is the number of device matches for that partition. The list is ordered from most number of matches to least. If there are a lot of devices to match against, this command could take a while to run. """ if len(argv) < 4: print Commands.list_parts.__doc__.strip() print print parse_search_value.__doc__.strip() exit(EXIT_ERROR) devs = [] for arg in argv[3:]: devs.extend(builder.search_devs(parse_search_value(arg)) or []) if not devs: print 'No matching devices found' exit(EXIT_ERROR) devs = [d['id'] for d in devs] max_replicas = int(ceil(builder.replicas)) matches = [array('i') for x in xrange(max_replicas)] for part in xrange(builder.parts): count = len([d for d in builder.get_part_devices(part) if d['id'] in devs]) if count: matches[max_replicas - count].append(part) print 'Partition Matches' for index, parts in enumerate(matches): for part in parts: print '%9d %7d' % (part, max_replicas - index) exit(EXIT_SUCCESS) def add(): """ swift-ring-builder add [r]z-:[R:]/_ [[r]z-:[R:]/_ ] ... Where and are replication ip and port. or swift-ring-builder add [--region ] --zone --ip --port --replication-ip --replication-port --device --meta --weight Adds devices to the ring with the given information. No partitions will be assigned to the new device until after running 'rebalance'. This is so you can make multiple device changes and rebalance them all just once. """ if len(argv) < 5 or len(argv) % 2 != 1: print Commands.add.__doc__.strip() exit(EXIT_ERROR) for new_dev in _parse_add_values(argv[3:]): for dev in builder.devs: if dev is None: continue if dev['ip'] == new_dev['ip'] and \ dev['port'] == new_dev['port'] and \ dev['device'] == new_dev['device']: print 'Device %d already uses %s:%d/%s.' % \ (dev['id'], dev['ip'], dev['port'], dev['device']) print "The on-disk ring builder is unchanged.\n" exit(EXIT_ERROR) dev_id = builder.add_dev(new_dev) print('Device %s with %s weight got id %s' % (format_device(new_dev), new_dev['weight'], dev_id)) builder.save(argv[1]) exit(EXIT_SUCCESS) def set_weight(): """ swift-ring-builder set_weight [ 1: print 'Matched more than one device:' for dev in devs: print ' %s' % format_device(dev) if raw_input('Are you sure you want to update the weight for ' 'these %s devices? (y/N) ' % len(devs)) != 'y': print 'Aborting device modifications' exit(EXIT_ERROR) for dev in devs: builder.set_dev_weight(dev['id'], weight) print '%s weight set to %s' % (format_device(dev), dev['weight']) builder.save(argv[1]) exit(EXIT_SUCCESS) def set_info(): """ swift-ring-builder set_info :[R:]/_ [ :[R:]/_] ... Where and are replication ip and port. For each search-value, resets the matched device's information. This information isn't used to assign partitions, so you can use 'write_ring' afterward to rewrite the current ring with the newer device information. Any of the parts are optional in the final :/_ parameter; just give what you want to change. For instance set_info d74 _"snet: 5.6.7.8" would just update the meta data for device id 74. """ if len(argv) < 5 or len(argv) % 2 != 1: print Commands.set_info.__doc__.strip() print print parse_search_value.__doc__.strip() exit(EXIT_ERROR) searches_and_changes = izip(islice(argv, 3, len(argv), 2), islice(argv, 4, len(argv), 2)) for search_value, change_value in searches_and_changes: devs = builder.search_devs(parse_search_value(search_value)) change = [] if len(change_value) and change_value[0].isdigit(): i = 1 while (i < len(change_value) and change_value[i] in '0123456789.'): i += 1 change.append(('ip', change_value[:i])) change_value = change_value[i:] elif len(change_value) and change_value[0] == '[': i = 1 while i < len(change_value) and change_value[i] != ']': i += 1 i += 1 change.append(('ip', change_value[:i].lstrip('[').rstrip(']'))) change_value = change_value[i:] if change_value.startswith(':'): i = 1 while i < len(change_value) and change_value[i].isdigit(): i += 1 change.append(('port', int(change_value[1:i]))) change_value = change_value[i:] if change_value.startswith('R'): change_value = change_value[1:] if len(change_value) and change_value[0].isdigit(): i = 1 while (i < len(change_value) and change_value[i] in '0123456789.'): i += 1 change.append(('replication_ip', change_value[:i])) change_value = change_value[i:] elif len(change_value) and change_value[0] == '[': i = 1 while i < len(change_value) and change_value[i] != ']': i += 1 i += 1 change.append(('replication_ip', change_value[:i].lstrip('[').rstrip(']'))) change_value = change_value[i:] if change_value.startswith(':'): i = 1 while i < len(change_value) and change_value[i].isdigit(): i += 1 change.append(('replication_port', int(change_value[1:i]))) change_value = change_value[i:] if change_value.startswith('/'): i = 1 while i < len(change_value) and change_value[i] != '_': i += 1 change.append(('device', change_value[1:i])) change_value = change_value[i:] if change_value.startswith('_'): change.append(('meta', change_value[1:])) change_value = '' if change_value or not change: raise ValueError('Invalid set info change value: %s' % repr(argv[4])) if not devs: print("Search value \"%s\" matched 0 devices.\n" "The on-disk ring builder is unchanged.\n" % search_value) exit(EXIT_ERROR) if len(devs) > 1: print 'Matched more than one device:' for dev in devs: print ' %s' % format_device(dev) if raw_input('Are you sure you want to update the info for ' 'these %s devices? (y/N) ' % len(devs)) != 'y': print 'Aborting device modifications' exit(EXIT_ERROR) for dev in devs: orig_dev_string = format_device(dev) test_dev = dict(dev) for key, value in change: test_dev[key] = value for check_dev in builder.devs: if not check_dev or check_dev['id'] == test_dev['id']: continue if check_dev['ip'] == test_dev['ip'] and \ check_dev['port'] == test_dev['port'] and \ check_dev['device'] == test_dev['device']: print 'Device %d already uses %s:%d/%s.' % \ (check_dev['id'], check_dev['ip'], check_dev['port'], check_dev['device']) exit(EXIT_ERROR) for key, value in change: dev[key] = value print 'Device %s is now %s' % (orig_dev_string, format_device(dev)) builder.save(argv[1]) exit(EXIT_SUCCESS) def remove(): """ swift-ring-builder remove [search-value ...] Removes the device(s) from the ring. This should normally just be used for a device that has failed. For a device you wish to decommission, it's best to set its weight to 0, wait for it to drain all its data, then use this remove command. This will not take effect until after running 'rebalance'. This is so you can make multiple device changes and rebalance them all just once. """ if len(argv) < 4: print Commands.remove.__doc__.strip() print print parse_search_value.__doc__.strip() exit(EXIT_ERROR) for search_value in argv[3:]: devs = builder.search_devs(parse_search_value(search_value)) if not devs: print("Search value \"%s\" matched 0 devices.\n" "The on-disk ring builder is unchanged." % search_value) exit(EXIT_ERROR) if len(devs) > 1: print 'Matched more than one device:' for dev in devs: print ' %s' % format_device(dev) if raw_input('Are you sure you want to remove these %s ' 'devices? (y/N) ' % len(devs)) != 'y': print 'Aborting device removals' exit(EXIT_ERROR) for dev in devs: try: builder.remove_dev(dev['id']) except exceptions.RingBuilderError as e: print '-' * 79 print( "An error occurred while removing device with id %d\n" "This usually means that you attempted to remove\n" "the last device in a ring. If this is the case,\n" "consider creating a new ring instead.\n" "The on-disk ring builder is unchanged.\n" "Original exception message: %s" % (dev['id'], e.message) ) print '-' * 79 exit(EXIT_ERROR) print '%s marked for removal and will ' \ 'be removed next rebalance.' % format_device(dev) builder.save(argv[1]) exit(EXIT_SUCCESS) def rebalance(): """ swift-ring-builder rebalance Attempts to rebalance the ring by reassigning partitions that haven't been recently reassigned. """ def get_seed(index): try: return argv[index] except IndexError: pass devs_changed = builder.devs_changed try: last_balance = builder.get_balance() parts, balance = builder.rebalance(seed=get_seed(3)) except exceptions.RingBuilderError as e: print '-' * 79 print ("An error has occurred during ring validation. Common\n" "causes of failure are rings that are empty or do not\n" "have enough devices to accommodate the replica count.\n" "Original exception message:\n %s" % e.message ) print '-' * 79 exit(EXIT_ERROR) if not parts: print 'No partitions could be reassigned.' print 'Either none need to be or none can be due to ' \ 'min_part_hours [%s].' % builder.min_part_hours exit(EXIT_WARNING) # If we set device's weight to zero, currently balance will be set # special value(MAX_BALANCE) until zero weighted device return all # its partitions. So we cannot check balance has changed. # Thus we need to check balance or last_balance is special value. if not devs_changed and abs(last_balance - balance) < 1 and \ not (last_balance == MAX_BALANCE and balance == MAX_BALANCE): print 'Cowardly refusing to save rebalance as it did not change ' \ 'at least 1%.' exit(EXIT_WARNING) try: builder.validate() except exceptions.RingValidationError as e: print '-' * 79 print ("An error has occurred during ring validation. Common\n" "causes of failure are rings that are empty or do not\n" "have enough devices to accommodate the replica count.\n" "Original exception message:\n %s" % e.message ) print '-' * 79 exit(EXIT_ERROR) print 'Reassigned %d (%.02f%%) partitions. Balance is now %.02f.' % \ (parts, 100.0 * parts / builder.parts, balance) status = EXIT_SUCCESS if balance > 5: print '-' * 79 print 'NOTE: Balance of %.02f indicates you should push this ' % \ balance print ' ring, wait at least %d hours, and rebalance/repush.' \ % builder.min_part_hours print '-' * 79 status = EXIT_WARNING ts = time() builder.get_ring().save( pathjoin(backup_dir, '%d.' % ts + basename(ring_file))) builder.save(pathjoin(backup_dir, '%d.' % ts + basename(argv[1]))) builder.get_ring().save(ring_file) builder.save(argv[1]) exit(status) def validate(): """ swift-ring-builder validate Just runs the validation routines on the ring. """ builder.validate() exit(EXIT_SUCCESS) def write_ring(): """ swift-ring-builder write_ring Just rewrites the distributable ring file. This is done automatically after a successful rebalance, so really this is only useful after one or more 'set_info' calls when no rebalance is needed but you want to send out the new device information. """ ring_data = builder.get_ring() if not ring_data._replica2part2dev_id: if ring_data.devs: print 'Warning: Writing a ring with no partition ' \ 'assignments but with devices; did you forget to run ' \ '"rebalance"?' else: print 'Warning: Writing an empty ring' ring_data.save( pathjoin(backup_dir, '%d.' % time() + basename(ring_file))) ring_data.save(ring_file) exit(EXIT_SUCCESS) def write_builder(): """ swift-ring-builder write_builder [min_part_hours] Recreate a builder from a ring file (lossy) if you lost your builder backups. (Protip: don't lose your builder backups). [min_part_hours] is one of those numbers lost to the builder, you can change it with set_min_part_hours. """ if exists(builder_file): print 'Cowardly refusing to overwrite existing ' \ 'Ring Builder file: %s' % builder_file exit(EXIT_ERROR) if len(argv) > 3: min_part_hours = int(argv[3]) else: stderr.write("WARNING: default min_part_hours may not match " "the value in the lost builder.\n") min_part_hours = 24 ring = Ring(ring_file) for dev in ring.devs: dev.update({ 'parts': 0, 'parts_wanted': 0, }) builder_dict = { 'part_power': 32 - ring._part_shift, 'replicas': float(ring.replica_count), 'min_part_hours': min_part_hours, 'parts': ring.partition_count, 'devs': ring.devs, 'devs_changed': False, 'version': 0, '_replica2part2dev': ring._replica2part2dev_id, '_last_part_moves_epoch': None, '_last_part_moves': None, '_last_part_gather_start': 0, '_remove_devs': [], } builder = RingBuilder(1, 1, 1) builder.copy_from(builder_dict) for parts in builder._replica2part2dev: for dev_id in parts: builder.devs[dev_id]['parts'] += 1 builder._set_parts_wanted() builder.save(builder_file) def pretend_min_part_hours_passed(): builder.pretend_min_part_hours_passed() builder.save(argv[1]) exit(EXIT_SUCCESS) def set_min_part_hours(): """ swift-ring-builder set_min_part_hours Changes the to the given . This should be set to however long a full replication/update cycle takes. We're working on a way to determine this more easily than scanning logs. """ if len(argv) < 4: print Commands.set_min_part_hours.__doc__.strip() exit(EXIT_ERROR) builder.change_min_part_hours(int(argv[3])) print 'The minimum number of hours before a partition can be ' \ 'reassigned is now set to %s' % argv[3] builder.save(argv[1]) exit(EXIT_SUCCESS) def set_replicas(): """ swift-ring-builder set_replicas Changes the replica count to the given . may be a floating-point value, in which case some partitions will have floor() replicas and some will have ceiling() in the correct proportions. A rebalance is needed to make the change take effect. """ if len(argv) < 4: print Commands.set_replicas.__doc__.strip() exit(EXIT_ERROR) new_replicas = argv[3] try: new_replicas = float(new_replicas) except ValueError: print Commands.set_replicas.__doc__.strip() print "\"%s\" is not a valid number." % new_replicas exit(EXIT_ERROR) if new_replicas < 1: print "Replica count must be at least 1." exit(EXIT_ERROR) builder.set_replicas(new_replicas) print 'The replica count is now %.6f.' % builder.replicas print 'The change will take effect after the next rebalance.' builder.save(argv[1]) exit(EXIT_SUCCESS) if __name__ == '__main__': if len(argv) < 2: print "swift-ring-builder %(MAJOR_VERSION)s.%(MINOR_VERSION)s\n" % \ globals() print Commands.default.__doc__.strip() print cmds = [c for c, f in Commands.__dict__.iteritems() if f.__doc__ and c[0] != '_' and c != 'default'] cmds.sort() for cmd in cmds: print Commands.__dict__[cmd].__doc__.strip() print print parse_search_value.__doc__.strip() print for line in wrap(' '.join(cmds), 79, initial_indent='Quick list: ', subsequent_indent=' '): print line print ('Exit codes: 0 = operation successful\n' ' 1 = operation completed with warnings\n' ' 2 = error') exit(EXIT_SUCCESS) builder_file, ring_file = parse_builder_ring_filename_args(argv) if exists(builder_file): builder = RingBuilder.load(builder_file) elif len(argv) < 3 or argv[2] not in('create', 'write_builder'): print 'Ring Builder file does not exist: %s' % argv[1] exit(EXIT_ERROR) backup_dir = pathjoin(dirname(argv[1]), 'backups') try: mkdir(backup_dir) except OSError as err: if err.errno != EEXIST: raise if len(argv) == 2: command = "default" else: command = argv[2] if argv[0].endswith('-safe'): try: with lock_parent_directory(abspath(argv[1]), 15): Commands.__dict__.get(command, Commands.unknown.im_func)() except exceptions.LockTimeout: print "Ring/builder dir currently locked." exit(2) else: Commands.__dict__.get(command, Commands.unknown.im_func)()