OpenStack Study: ringbuilder.py

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#! /usr/bin/env python

# 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 as sys_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

global argv, backup_dir, builder, builder_file, ring_file

argv = backup_dir = builder = builder_file = ring_file = None

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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)

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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"

while i < len(rest) and rest[i] != ']':

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

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]

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class Commands(object):

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def unknown():

print 'Unknown command: %s' % argv[2]

exit(EXIT_ERROR)

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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)

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def default():

"""

swift-ring-builder

Shows information about the ring and the devices within.

"""

print '%s, build version %d' % (argv[1], builder.version)

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)

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def search():

"""

swift-ring-builder search

Shows information about matching devices.

"""

if len(argv) < 4:

print Commands.search.__doc__.strip()

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)

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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 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)

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def add():

"""

swift-ring-builder add

[r]z-:[R:]/_

[[r]z-:[R:]/_

] ...

Where and are replication ip and port.

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)

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def set_weight():

"""

swift-ring-builder set_weight

[

Resets the devices' weights. No partitions will be reassigned to or from

the 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.set_weight.__doc__.strip()

print parse_search_value.__doc__.strip()

exit(EXIT_ERROR)

devs_and_weights = izip(islice(argv, 3, len(argv), 2),

islice(argv, 4, len(argv), 2))

for devstr, weightstr in devs_and_weights:

devs = builder.search_devs(parse_search_value(devstr))

weight = float(weightstr)

if not devs:

print("Search value \"%s\" matched 0 devices.\n"

"The on-disk ring builder is unchanged.\n"

% devstr)

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 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)

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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 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

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

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)

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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 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)

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def rebalance():

"""

swift-ring-builder rebalance

Attempts to rebalance the ring by reassigning partitions that haven't been

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 '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 ' \

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)

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def get_seed(index):

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 '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 ' \

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)

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def validate():

"""

swift-ring-builder validate

Just runs the validation routines on the ring.

"""

builder.validate()

exit(EXIT_SUCCESS)

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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)

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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:

'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)

**** CubicPower OpenStack Study ****

def pretend_min_part_hours_passed():

builder.pretend_min_part_hours_passed()

builder.save(argv[1])

exit(EXIT_SUCCESS)

**** CubicPower OpenStack Study ****

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)

**** CubicPower OpenStack Study ****

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)

def main(arguments=None):

global argv, backup_dir, builder, builder_file, ring_file

print "swift-ring-builder %(MAJOR_VERSION)s.%(MINOR_VERSION)s\n" % \

globals()

print Commands.default.__doc__.strip()

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 parse_search_value.__doc__.strip()

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:

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)()

if __name__ == '__main__':

main()

**** CubicPower OpenStack Study ****

def main(arguments=None):

global argv, backup_dir, builder, builder_file, ring_file

print "swift-ring-builder %(MAJOR_VERSION)s.%(MINOR_VERSION)s\n" % \

globals()

print Commands.default.__doc__.strip()

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 parse_search_value.__doc__.strip()

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:

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)()

if __name__ == '__main__':

main()