openstack/swift
Code Issues Proposed changes
swift/test/unit/common/ring/test_ring.py
Samuel Merritt decbcd24d4 Foundational support for PUT and GET of erasure-coded objects 
This commit makes it possible to PUT an object into Swift and have it
stored using erasure coding instead of replication, and also to GET
the object back from Swift at a later time.

This works by splitting the incoming object into a number of segments,
erasure-coding each segment in turn to get fragments, then
concatenating the fragments into fragment archives. Segments are 1 MiB
in size, except the last, which is between 1 B and 1 MiB.

+====================================================================+
|                             object data                            |
+====================================================================+

                                   |
          +------------------------+----------------------+
          |                        |                      |
          v                        v                      v

+===================+    +===================+         +==============+
|     segment 1     |    |     segment 2     |   ...   |   segment N  |
+===================+    +===================+         +==============+

          |                       |
          |                       |
          v                       v

     /=========\             /=========\
     | pyeclib |             | pyeclib |         ...
     \=========/             \=========/

          |                       |
          |                       |
          +--> fragment A-1       +--> fragment A-2
          |                       |
          |                       |
          |                       |
          |                       |
          |                       |
          +--> fragment B-1       +--> fragment B-2
          |                       |
          |                       |
         ...                     ...

Then, object server A gets the concatenation of fragment A-1, A-2,
..., A-N, so its .data file looks like this (called a "fragment archive"):

+=====================================================================+
|     fragment A-1     |     fragment A-2     |  ...  |  fragment A-N |
+=====================================================================+

Since this means that the object server never sees the object data as
the client sent it, we have to do a few things to ensure data
integrity.

First, the proxy has to check the Etag if the client provided it; the
object server can't do it since the object server doesn't see the raw
data.

Second, if the client does not provide an Etag, the proxy computes it
and uses the MIME-PUT mechanism to provide it to the object servers
after the object body. Otherwise, the object would not have an Etag at
all.

Third, the proxy computes the MD5 of each fragment archive and sends
it to the object server using the MIME-PUT mechanism. With replicated
objects, the proxy checks that the Etags from all the object servers
match, and if they don't, returns a 500 to the client. This mitigates
the risk of data corruption in one of the proxy --> object connections,
and signals to the client when it happens. With EC objects, we can't
use that same mechanism, so we must send the checksum with each
fragment archive to get comparable protection.

On the GET path, the inverse happens: the proxy connects to a bunch of
object servers (M of them, for an M+K scheme), reads one fragment at a
time from each fragment archive, decodes those fragments into a
segment, and serves the segment to the client.

When an object server dies partway through a GET response, any
partially-fetched fragment is discarded, the resumption point is wound
back to the nearest fragment boundary, and the GET is retried with the
next object server.

GET requests for a single byterange work; GET requests for multiple
byteranges do not.

There are a number of things _not_ included in this commit. Some of
them are listed here:

 * multi-range GET

 * deferred cleanup of old .data files

 * durability (daemon to reconstruct missing archives)

Co-Authored-By: Alistair Coles <alistair.coles@hp.com>
Co-Authored-By: Thiago da Silva <thiago@redhat.com>
Co-Authored-By: John Dickinson <me@not.mn>
Co-Authored-By: Clay Gerrard <clay.gerrard@gmail.com>
Co-Authored-By: Tushar Gohad <tushar.gohad@intel.com>
Co-Authored-By: Paul Luse <paul.e.luse@intel.com>
Co-Authored-By: Christian Schwede <christian.schwede@enovance.com>
Co-Authored-By: Yuan Zhou <yuan.zhou@intel.com>
Change-Id: I9c13c03616489f8eab7dcd7c5f21237ed4cb6fd2
2015-04-14 00:52:17 -07:00

769 lines
34 KiB
Python
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# 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.
import array
import cPickle as pickle
import os
import sys
import unittest
import stat
from contextlib import closing
from gzip import GzipFile
from tempfile import mkdtemp
from shutil import rmtree
from time import sleep, time
from swift.common import ring, utils
class TestRingBase(unittest.TestCase):
def setUp(self):
self._orig_hash_suffix = utils.HASH_PATH_SUFFIX
self._orig_hash_prefix = utils.HASH_PATH_PREFIX
utils.HASH_PATH_SUFFIX = 'endcap'
utils.HASH_PATH_PREFIX = ''
def tearDown(self):
utils.HASH_PATH_SUFFIX = self._orig_hash_suffix
utils.HASH_PATH_PREFIX = self._orig_hash_prefix
class TestRingData(unittest.TestCase):
def setUp(self):
self.testdir = os.path.join(os.path.dirname(__file__), 'ring_data')
rmtree(self.testdir, ignore_errors=1)
os.mkdir(self.testdir)
def tearDown(self):
rmtree(self.testdir, ignore_errors=1)
def assert_ring_data_equal(self, rd_expected, rd_got):
self.assertEquals(rd_expected._replica2part2dev_id,
rd_got._replica2part2dev_id)
self.assertEquals(rd_expected.devs, rd_got.devs)
self.assertEquals(rd_expected._part_shift, rd_got._part_shift)
def test_attrs(self):
r2p2d = [[0, 1, 0, 1], [0, 1, 0, 1]]
d = [{'id': 0, 'zone': 0, 'region': 0, 'ip': '10.1.1.0', 'port': 7000},
{'id': 1, 'zone': 1, 'region': 1, 'ip': '10.1.1.1', 'port': 7000}]
s = 30
rd = ring.RingData(r2p2d, d, s)
self.assertEquals(rd._replica2part2dev_id, r2p2d)
self.assertEquals(rd.devs, d)
self.assertEquals(rd._part_shift, s)
def test_can_load_pickled_ring_data(self):
rd = ring.RingData(
[[0, 1, 0, 1], [0, 1, 0, 1]],
[{'id': 0, 'zone': 0, 'ip': '10.1.1.0', 'port': 7000},
{'id': 1, 'zone': 1, 'ip': '10.1.1.1', 'port': 7000}],
30)
ring_fname = os.path.join(self.testdir, 'foo.ring.gz')
for p in xrange(pickle.HIGHEST_PROTOCOL):
with closing(GzipFile(ring_fname, 'wb')) as f:
pickle.dump(rd, f, protocol=p)
ring_data = ring.RingData.load(ring_fname)
self.assert_ring_data_equal(rd, ring_data)
def test_roundtrip_serialization(self):
ring_fname = os.path.join(self.testdir, 'foo.ring.gz')
rd = ring.RingData(
[array.array('H', [0, 1, 0, 1]), array.array('H', [0, 1, 0, 1])],
[{'id': 0, 'zone': 0}, {'id': 1, 'zone': 1}], 30)
rd.save(ring_fname)
rd2 = ring.RingData.load(ring_fname)
self.assert_ring_data_equal(rd, rd2)
def test_deterministic_serialization(self):
"""
Two identical rings should produce identical .gz files on disk.
Only true on Python 2.7 or greater.
"""
if sys.version_info[0] == 2 and sys.version_info[1] < 7:
return
os.mkdir(os.path.join(self.testdir, '1'))
os.mkdir(os.path.join(self.testdir, '2'))
# These have to have the same filename (not full path,
# obviously) since the filename gets encoded in the gzip data.
ring_fname1 = os.path.join(self.testdir, '1', 'the.ring.gz')
ring_fname2 = os.path.join(self.testdir, '2', 'the.ring.gz')
rd = ring.RingData(
[array.array('H', [0, 1, 0, 1]), array.array('H', [0, 1, 0, 1])],
[{'id': 0, 'zone': 0}, {'id': 1, 'zone': 1}], 30)
rd.save(ring_fname1)
rd.save(ring_fname2)
with open(ring_fname1) as ring1:
with open(ring_fname2) as ring2:
self.assertEqual(ring1.read(), ring2.read())
def test_permissions(self):
ring_fname = os.path.join(self.testdir, 'stat.ring.gz')
rd = ring.RingData(
[array.array('H', [0, 1, 0, 1]), array.array('H', [0, 1, 0, 1])],
[{'id': 0, 'zone': 0}, {'id': 1, 'zone': 1}], 30)
rd.save(ring_fname)
self.assertEqual(oct(stat.S_IMODE(os.stat(ring_fname).st_mode)),
'0644')
class TestRing(TestRingBase):
def setUp(self):
super(TestRing, self).setUp()
self.testdir = mkdtemp()
self.testgz = os.path.join(self.testdir, 'whatever.ring.gz')
self.intended_replica2part2dev_id = [
array.array('H', [0, 1, 0, 1]),
array.array('H', [0, 1, 0, 1]),
array.array('H', [3, 4, 3, 4])]
self.intended_devs = [{'id': 0, 'region': 0, 'zone': 0, 'weight': 1.0,
'ip': '10.1.1.1', 'port': 6000,
'replication_ip': '10.1.0.1',
'replication_port': 6066},
{'id': 1, 'region': 0, 'zone': 0, 'weight': 1.0,
'ip': '10.1.1.1', 'port': 6000,
'replication_ip': '10.1.0.2',
'replication_port': 6066},
None,
{'id': 3, 'region': 0, 'zone': 2, 'weight': 1.0,
'ip': '10.1.2.1', 'port': 6000,
'replication_ip': '10.2.0.1',
'replication_port': 6066},
{'id': 4, 'region': 0, 'zone': 2, 'weight': 1.0,
'ip': '10.1.2.2', 'port': 6000,
'replication_ip': '10.2.0.1',
'replication_port': 6066}]
self.intended_part_shift = 30
self.intended_reload_time = 15
ring.RingData(
self.intended_replica2part2dev_id,
self.intended_devs, self.intended_part_shift).save(self.testgz)
self.ring = ring.Ring(
self.testdir,
reload_time=self.intended_reload_time, ring_name='whatever')
def tearDown(self):
super(TestRing, self).tearDown()
rmtree(self.testdir, ignore_errors=1)
def test_creation(self):
self.assertEquals(self.ring._replica2part2dev_id,
self.intended_replica2part2dev_id)
self.assertEquals(self.ring._part_shift, self.intended_part_shift)
self.assertEquals(self.ring.devs, self.intended_devs)
self.assertEquals(self.ring.reload_time, self.intended_reload_time)
self.assertEquals(self.ring.serialized_path, self.testgz)
# test invalid endcap
_orig_hash_path_suffix = utils.HASH_PATH_SUFFIX
_orig_hash_path_prefix = utils.HASH_PATH_PREFIX
_orig_swift_conf_file = utils.SWIFT_CONF_FILE
try:
utils.HASH_PATH_SUFFIX = ''
utils.HASH_PATH_PREFIX = ''
utils.SWIFT_CONF_FILE = ''
self.assertRaises(SystemExit, ring.Ring, self.testdir, 'whatever')
finally:
utils.HASH_PATH_SUFFIX = _orig_hash_path_suffix
utils.HASH_PATH_PREFIX = _orig_hash_path_prefix
utils.SWIFT_CONF_FILE = _orig_swift_conf_file
def test_has_changed(self):
self.assertEquals(self.ring.has_changed(), False)
os.utime(self.testgz, (time() + 60, time() + 60))
self.assertEquals(self.ring.has_changed(), True)
def test_reload(self):
os.utime(self.testgz, (time() - 300, time() - 300))
self.ring = ring.Ring(self.testdir, reload_time=0.001,
ring_name='whatever')
orig_mtime = self.ring._mtime
self.assertEquals(len(self.ring.devs), 5)
self.intended_devs.append(
{'id': 3, 'region': 0, 'zone': 3, 'weight': 1.0,
'ip': '10.1.1.1', 'port': 9876})
ring.RingData(
self.intended_replica2part2dev_id,
self.intended_devs, self.intended_part_shift).save(self.testgz)
sleep(0.1)
self.ring.get_nodes('a')
self.assertEquals(len(self.ring.devs), 6)
self.assertNotEquals(self.ring._mtime, orig_mtime)
os.utime(self.testgz, (time() - 300, time() - 300))
self.ring = ring.Ring(self.testdir, reload_time=0.001,
ring_name='whatever')
orig_mtime = self.ring._mtime
self.assertEquals(len(self.ring.devs), 6)
self.intended_devs.append(
{'id': 5, 'region': 0, 'zone': 4, 'weight': 1.0,
'ip': '10.5.5.5', 'port': 9876})
ring.RingData(
self.intended_replica2part2dev_id,
self.intended_devs, self.intended_part_shift).save(self.testgz)
sleep(0.1)
self.ring.get_part_nodes(0)
self.assertEquals(len(self.ring.devs), 7)
self.assertNotEquals(self.ring._mtime, orig_mtime)
os.utime(self.testgz, (time() - 300, time() - 300))
self.ring = ring.Ring(self.testdir, reload_time=0.001,
ring_name='whatever')
orig_mtime = self.ring._mtime
part, nodes = self.ring.get_nodes('a')
self.assertEquals(len(self.ring.devs), 7)
self.intended_devs.append(
{'id': 6, 'region': 0, 'zone': 5, 'weight': 1.0,
'ip': '10.6.6.6', 'port': 6000})
ring.RingData(
self.intended_replica2part2dev_id,
self.intended_devs, self.intended_part_shift).save(self.testgz)
sleep(0.1)
self.ring.get_more_nodes(part).next()
self.assertEquals(len(self.ring.devs), 8)
self.assertNotEquals(self.ring._mtime, orig_mtime)
os.utime(self.testgz, (time() - 300, time() - 300))
self.ring = ring.Ring(self.testdir, reload_time=0.001,
ring_name='whatever')
orig_mtime = self.ring._mtime
self.assertEquals(len(self.ring.devs), 8)
self.intended_devs.append(
{'id': 5, 'region': 0, 'zone': 4, 'weight': 1.0,
'ip': '10.5.5.5', 'port': 6000})
ring.RingData(
self.intended_replica2part2dev_id,
self.intended_devs, self.intended_part_shift).save(self.testgz)
sleep(0.1)
self.assertEquals(len(self.ring.devs), 9)
self.assertNotEquals(self.ring._mtime, orig_mtime)
def test_reload_without_replication(self):
replication_less_devs = [{'id': 0, 'region': 0, 'zone': 0,
'weight': 1.0, 'ip': '10.1.1.1',
'port': 6000},
{'id': 1, 'region': 0, 'zone': 0,
'weight': 1.0, 'ip': '10.1.1.1',
'port': 6000},
None,
{'id': 3, 'region': 0, 'zone': 2,
'weight': 1.0, 'ip': '10.1.2.1',
'port': 6000},
{'id': 4, 'region': 0, 'zone': 2,
'weight': 1.0, 'ip': '10.1.2.2',
'port': 6000}]
intended_devs = [{'id': 0, 'region': 0, 'zone': 0, 'weight': 1.0,
'ip': '10.1.1.1', 'port': 6000,
'replication_ip': '10.1.1.1',
'replication_port': 6000},
{'id': 1, 'region': 0, 'zone': 0, 'weight': 1.0,
'ip': '10.1.1.1', 'port': 6000,
'replication_ip': '10.1.1.1',
'replication_port': 6000},
None,
{'id': 3, 'region': 0, 'zone': 2, 'weight': 1.0,
'ip': '10.1.2.1', 'port': 6000,
'replication_ip': '10.1.2.1',
'replication_port': 6000},
{'id': 4, 'region': 0, 'zone': 2, 'weight': 1.0,
'ip': '10.1.2.2', 'port': 6000,
'replication_ip': '10.1.2.2',
'replication_port': 6000}]
testgz = os.path.join(self.testdir, 'without_replication.ring.gz')
ring.RingData(
self.intended_replica2part2dev_id,
replication_less_devs, self.intended_part_shift).save(testgz)
self.ring = ring.Ring(
self.testdir,
reload_time=self.intended_reload_time,
ring_name='without_replication')
self.assertEquals(self.ring.devs, intended_devs)
def test_reload_old_style_pickled_ring(self):
devs = [{'id': 0, 'zone': 0,
'weight': 1.0, 'ip': '10.1.1.1',
'port': 6000},
{'id': 1, 'zone': 0,
'weight': 1.0, 'ip': '10.1.1.1',
'port': 6000},
None,
{'id': 3, 'zone': 2,
'weight': 1.0, 'ip': '10.1.2.1',
'port': 6000},
{'id': 4, 'zone': 2,
'weight': 1.0, 'ip': '10.1.2.2',
'port': 6000}]
intended_devs = [{'id': 0, 'region': 1, 'zone': 0, 'weight': 1.0,
'ip': '10.1.1.1', 'port': 6000,
'replication_ip': '10.1.1.1',
'replication_port': 6000},
{'id': 1, 'region': 1, 'zone': 0, 'weight': 1.0,
'ip': '10.1.1.1', 'port': 6000,
'replication_ip': '10.1.1.1',
'replication_port': 6000},
None,
{'id': 3, 'region': 1, 'zone': 2, 'weight': 1.0,
'ip': '10.1.2.1', 'port': 6000,
'replication_ip': '10.1.2.1',
'replication_port': 6000},
{'id': 4, 'region': 1, 'zone': 2, 'weight': 1.0,
'ip': '10.1.2.2', 'port': 6000,
'replication_ip': '10.1.2.2',
'replication_port': 6000}]
# simulate an old-style pickled ring
testgz = os.path.join(self.testdir,
'without_replication_or_region.ring.gz')
ring_data = ring.RingData(self.intended_replica2part2dev_id,
devs,
self.intended_part_shift)
# an old-style pickled ring won't have region data
for dev in ring_data.devs:
if dev:
del dev["region"]
gz_file = GzipFile(testgz, 'wb')
pickle.dump(ring_data, gz_file, protocol=2)
gz_file.close()
self.ring = ring.Ring(
self.testdir,
reload_time=self.intended_reload_time,
ring_name='without_replication_or_region')
self.assertEquals(self.ring.devs, intended_devs)
def test_get_part(self):
part1 = self.ring.get_part('a')
nodes1 = self.ring.get_part_nodes(part1)
part2, nodes2 = self.ring.get_nodes('a')
self.assertEquals(part1, part2)
self.assertEquals(nodes1, nodes2)
def test_get_part_nodes(self):
part, nodes = self.ring.get_nodes('a')
self.assertEquals(nodes, self.ring.get_part_nodes(part))
def test_get_nodes(self):
# Yes, these tests are deliberately very fragile. We want to make sure
# that if someones changes the results the ring produces, they know it.
self.assertRaises(TypeError, self.ring.get_nodes)
part, nodes = self.ring.get_nodes('a')
self.assertEquals(part, 0)
self.assertEquals(nodes, [dict(node, index=i) for i, node in
enumerate([self.intended_devs[0],
self.intended_devs[3]])])
part, nodes = self.ring.get_nodes('a1')
self.assertEquals(part, 0)
self.assertEquals(nodes, [dict(node, index=i) for i, node in
enumerate([self.intended_devs[0],
self.intended_devs[3]])])
part, nodes = self.ring.get_nodes('a4')
self.assertEquals(part, 1)
self.assertEquals(nodes, [dict(node, index=i) for i, node in
enumerate([self.intended_devs[1],
self.intended_devs[4]])])
part, nodes = self.ring.get_nodes('aa')
self.assertEquals(part, 1)
self.assertEquals(nodes, [dict(node, index=i) for i, node in
enumerate([self.intended_devs[1],
self.intended_devs[4]])])
part, nodes = self.ring.get_nodes('a', 'c1')
self.assertEquals(part, 0)
self.assertEquals(nodes, [dict(node, index=i) for i, node in
enumerate([self.intended_devs[0],
self.intended_devs[3]])])
part, nodes = self.ring.get_nodes('a', 'c0')
self.assertEquals(part, 3)
self.assertEquals(nodes, [dict(node, index=i) for i, node in
enumerate([self.intended_devs[1],
self.intended_devs[4]])])
part, nodes = self.ring.get_nodes('a', 'c3')
self.assertEquals(part, 2)
self.assertEquals(nodes, [dict(node, index=i) for i, node in
enumerate([self.intended_devs[0],
self.intended_devs[3]])])
part, nodes = self.ring.get_nodes('a', 'c2')
self.assertEquals(nodes, [dict(node, index=i) for i, node in
enumerate([self.intended_devs[0],
self.intended_devs[3]])])
part, nodes = self.ring.get_nodes('a', 'c', 'o1')
self.assertEquals(part, 1)
self.assertEquals(nodes, [dict(node, index=i) for i, node in
enumerate([self.intended_devs[1],
self.intended_devs[4]])])
part, nodes = self.ring.get_nodes('a', 'c', 'o5')
self.assertEquals(part, 0)
self.assertEquals(nodes, [dict(node, index=i) for i, node in
enumerate([self.intended_devs[0],
self.intended_devs[3]])])
part, nodes = self.ring.get_nodes('a', 'c', 'o0')
self.assertEquals(part, 0)
self.assertEquals(nodes, [dict(node, index=i) for i, node in
enumerate([self.intended_devs[0],
self.intended_devs[3]])])
part, nodes = self.ring.get_nodes('a', 'c', 'o2')
self.assertEquals(part, 2)
self.assertEquals(nodes, [dict(node, index=i) for i, node in
enumerate([self.intended_devs[0],
self.intended_devs[3]])])
def add_dev_to_ring(self, new_dev):
self.ring.devs.append(new_dev)
self.ring._rebuild_tier_data()
def test_get_more_nodes(self):
# Yes, these tests are deliberately very fragile. We want to make sure
# that if someone changes the results the ring produces, they know it.
exp_part = 6
exp_devs = [48, 93, 96]
exp_zones = set([5, 8, 9])
exp_handoffs = [11, 47, 25, 76, 69, 23, 99, 59, 106, 64, 43, 34, 88, 3,
30, 83, 16, 27, 103, 39, 60, 0, 8, 72, 56, 19, 91, 13,
84, 38, 66, 52, 78, 107, 50, 57, 31, 32, 77, 24, 42,
100, 71, 26, 9, 20, 35, 5, 14, 94, 28, 41, 18, 102,
101, 61, 95, 21, 81, 1, 105, 58, 74, 90, 86, 46, 4, 68,
40, 80, 54, 75, 45, 79, 44, 49, 62, 29, 7, 15, 70, 87,
65, 12, 82, 17, 104, 97, 55, 22, 6, 89, 2, 67, 37, 63,
53, 92, 33, 85, 73, 51, 98, 36, 10]
exp_first_handoffs = [1, 37, 48, 68, 84, 75, 11, 101, 14, 73, 100, 75,
29, 19, 18, 101, 15, 99, 95, 24, 46, 82, 73, 62,
24, 89, 9, 22, 107, 74, 54, 63, 40, 106, 99, 83,
64, 73, 73, 106, 106, 80, 6, 25, 20, 33, 6, 79,
59, 42, 62, 24, 14, 107, 28, 0, 85, 5, 4, 12, 58,
11, 92, 18, 36, 56, 86, 1, 21, 33, 80, 97, 4, 81,
79, 76, 89, 50, 75, 27, 7, 96, 47, 55, 81, 104,
12, 5, 18, 106, 27, 93, 39, 92, 42, 30, 20, 88,
58, 105, 65, 29, 17, 52, 11, 106, 7, 24, 21, 91,
62, 52, 50, 31, 77, 102, 19, 11, 8, 58, 53, 20,
26, 8, 18, 82, 48, 68, 82, 89, 101, 50, 3, 52,
46, 11, 2, 30, 79, 66, 4, 61, 3, 56, 45, 102, 73,
84, 36, 19, 34, 84, 49, 40, 103, 66, 31, 33, 93,
33, 4, 52, 26, 58, 30, 47, 100, 57, 40, 79, 33,
107, 24, 20, 44, 4, 7, 59, 83, 101, 1, 56, 20,
61, 33, 16, 5, 74, 98, 4, 80, 15, 104, 52, 73,
18, 67, 75, 98, 73, 79, 68, 75, 27, 91, 36, 100,
52, 95, 37, 46, 70, 14, 47, 3, 70, 23, 40, 105,
62, 86, 48, 22, 54, 4, 72, 81, 13, 0, 18, 98,
101, 36, 29, 24, 39, 79, 97, 105, 28, 107, 47,
52, 101, 20, 22, 29, 65, 27, 7, 33, 64, 101, 60,
19, 55]
rb = ring.RingBuilder(8, 3, 1)
next_dev_id = 0
for zone in xrange(1, 10):
for server in xrange(1, 5):
for device in xrange(1, 4):
rb.add_dev({'id': next_dev_id,
'ip': '1.2.%d.%d' % (zone, server),
'port': 1234, 'zone': zone, 'region': 0,
'weight': 1.0})
next_dev_id += 1
rb.rebalance(seed=1)
rb.get_ring().save(self.testgz)
r = ring.Ring(self.testdir, ring_name='whatever')
part, devs = r.get_nodes('a', 'c', 'o')
primary_zones = set([d['zone'] for d in devs])
self.assertEquals(part, exp_part)
self.assertEquals([d['id'] for d in devs], exp_devs)
self.assertEquals(primary_zones, exp_zones)
devs = list(r.get_more_nodes(part))
self.assertEquals([d['id'] for d in devs], exp_handoffs)
# The first 6 replicas plus the 3 primary nodes should cover all 9
# zones in this test
seen_zones = set(primary_zones)
seen_zones.update([d['zone'] for d in devs[:6]])
self.assertEquals(seen_zones, set(range(1, 10)))
# The first handoff nodes for each partition in the ring
devs = []
for part in xrange(r.partition_count):
devs.append(r.get_more_nodes(part).next()['id'])
self.assertEquals(devs, exp_first_handoffs)
# Add a new device we can handoff to.
zone = 5
server = 0
rb.add_dev({'id': next_dev_id,
'ip': '1.2.%d.%d' % (zone, server),
'port': 1234, 'zone': zone, 'region': 0, 'weight': 1.0})
next_dev_id += 1
rb.rebalance(seed=1)
rb.get_ring().save(self.testgz)
r = ring.Ring(self.testdir, ring_name='whatever')
# We would change expectations here, but in this test no handoffs
# changed at all.
part, devs = r.get_nodes('a', 'c', 'o')
primary_zones = set([d['zone'] for d in devs])
self.assertEquals(part, exp_part)
self.assertEquals([d['id'] for d in devs], exp_devs)
self.assertEquals(primary_zones, exp_zones)
devs = list(r.get_more_nodes(part))
dev_ids = [d['id'] for d in devs]
self.assertEquals(len(dev_ids), len(exp_handoffs))
for index, dev in enumerate(dev_ids):
self.assertEquals(
dev, exp_handoffs[index],
'handoff differs at position %d\n%s\n%s' % (
index, dev_ids[index:], exp_handoffs[index:]))
# The handoffs still cover all the non-primary zones first
seen_zones = set(primary_zones)
seen_zones.update([d['zone'] for d in devs[:6]])
self.assertEquals(seen_zones, set(range(1, 10)))
devs = []
for part in xrange(r.partition_count):
devs.append(r.get_more_nodes(part).next()['id'])
for part in xrange(r.partition_count):
self.assertEquals(
devs[part], exp_first_handoffs[part],
'handoff for partitition %d is now device id %d' % (
part, devs[part]))
# Remove a device.
rb.remove_dev(0)
rb.rebalance(seed=1)
rb.get_ring().save(self.testgz)
r = ring.Ring(self.testdir, ring_name='whatever')
# Change expectations
# The long string of handoff nodes for the partition were the same for
# the first 20, which is pretty good.
exp_handoffs[20:] = [60, 108, 8, 72, 56, 19, 91, 13, 84, 38, 66, 52,
1, 78, 107, 50, 57, 31, 32, 77, 24, 42, 100, 71,
26, 9, 20, 35, 5, 14, 94, 28, 41, 18, 102, 101,
61, 95, 21, 81, 105, 58, 74, 90, 86, 46, 4, 68,
40, 80, 54, 75, 45, 79, 44, 49, 62, 29, 7, 15, 70,
87, 65, 12, 82, 17, 104, 97, 55, 22, 6, 89, 2, 67,
37, 63, 53, 92, 33, 85, 73, 51, 98, 36, 10]
# Just a few of the first handoffs changed
exp_first_handoffs[3] = 68
exp_first_handoffs[55] = 104
exp_first_handoffs[116] = 6
exp_first_handoffs[181] = 15
exp_first_handoffs[228] = 38
# Test
part, devs = r.get_nodes('a', 'c', 'o')
primary_zones = set([d['zone'] for d in devs])
self.assertEquals(part, exp_part)
self.assertEquals([d['id'] for d in devs], exp_devs)
self.assertEquals(primary_zones, exp_zones)
devs = list(r.get_more_nodes(part))
dev_ids = [d['id'] for d in devs]
self.assertEquals(len(dev_ids), len(exp_handoffs))
for index, dev in enumerate(dev_ids):
self.assertEquals(
dev, exp_handoffs[index],
'handoff differs at position %d\n%s\n%s' % (
index, dev_ids[index:], exp_handoffs[index:]))
seen_zones = set(primary_zones)
seen_zones.update([d['zone'] for d in devs[:6]])
self.assertEquals(seen_zones, set(range(1, 10)))
devs = []
for part in xrange(r.partition_count):
devs.append(r.get_more_nodes(part).next()['id'])
for part in xrange(r.partition_count):
self.assertEquals(
devs[part], exp_first_handoffs[part],
'handoff for partitition %d is now device id %d' % (
part, devs[part]))
# Add a partial replica
rb.set_replicas(3.5)
rb.rebalance(seed=1)
rb.get_ring().save(self.testgz)
r = ring.Ring(self.testdir, ring_name='whatever')
# Change expectations
# We have another replica now
exp_devs.append(47)
exp_zones.add(4)
# Caused some major changes in the sequence of handoffs for our test
# partition, but at least the first stayed the same.
exp_handoffs[1:] = [81, 25, 69, 23, 99, 59, 76, 3, 106, 64, 43, 13, 34,
88, 30, 16, 27, 103, 39, 74, 60, 108, 8, 56, 19,
91, 52, 84, 38, 66, 1, 78, 45, 107, 50, 57, 83, 31,
46, 32, 77, 24, 42, 63, 100, 72, 71, 7, 26, 9, 20,
35, 5, 87, 14, 94, 62, 28, 41, 90, 18, 82, 102, 22,
101, 61, 85, 95, 21, 98, 67, 105, 58, 86, 4, 79,
68, 40, 80, 54, 75, 44, 49, 6, 29, 15, 70, 65, 12,
17, 104, 97, 55, 89, 2, 37, 53, 92, 33, 73, 51, 36,
10]
# Lots of first handoffs changed, but 30 of 256 is still just 11.72%.
exp_first_handoffs[1] = 6
exp_first_handoffs[4] = 104
exp_first_handoffs[11] = 106
exp_first_handoffs[17] = 13
exp_first_handoffs[21] = 77
exp_first_handoffs[22] = 95
exp_first_handoffs[27] = 46
exp_first_handoffs[29] = 65
exp_first_handoffs[30] = 3
exp_first_handoffs[31] = 20
exp_first_handoffs[51] = 50
exp_first_handoffs[53] = 8
exp_first_handoffs[54] = 2
exp_first_handoffs[72] = 107
exp_first_handoffs[79] = 72
exp_first_handoffs[85] = 71
exp_first_handoffs[88] = 66
exp_first_handoffs[92] = 29
exp_first_handoffs[93] = 46
exp_first_handoffs[96] = 38
exp_first_handoffs[101] = 57
exp_first_handoffs[103] = 87
exp_first_handoffs[104] = 28
exp_first_handoffs[107] = 1
exp_first_handoffs[109] = 69
exp_first_handoffs[110] = 50
exp_first_handoffs[111] = 76
exp_first_handoffs[115] = 47
exp_first_handoffs[117] = 48
exp_first_handoffs[119] = 7
# Test
part, devs = r.get_nodes('a', 'c', 'o')
primary_zones = set([d['zone'] for d in devs])
self.assertEquals(part, exp_part)
self.assertEquals([d['id'] for d in devs], exp_devs)
self.assertEquals(primary_zones, exp_zones)
devs = list(r.get_more_nodes(part))
dev_ids = [d['id'] for d in devs]
self.assertEquals(len(dev_ids), len(exp_handoffs))
for index, dev in enumerate(dev_ids):
self.assertEquals(
dev, exp_handoffs[index],
'handoff differs at position %d\n%s\n%s' % (
index, dev_ids[index:], exp_handoffs[index:]))
seen_zones = set(primary_zones)
seen_zones.update([d['zone'] for d in devs[:6]])
self.assertEquals(seen_zones, set(range(1, 10)))
devs = []
for part in xrange(r.partition_count):
devs.append(r.get_more_nodes(part).next()['id'])
for part in xrange(r.partition_count):
self.assertEquals(
devs[part], exp_first_handoffs[part],
'handoff for partitition %d is now device id %d' % (
part, devs[part]))
# One last test of a partial replica partition
exp_part2 = 136
exp_devs2 = [52, 76, 97]
exp_zones2 = set([9, 5, 7])
exp_handoffs2 = [2, 67, 37, 92, 33, 23, 107, 63, 44, 103, 108, 85,
73, 10, 89, 80, 4, 17, 49, 32, 12, 41, 58, 20, 25,
61, 94, 47, 69, 56, 101, 28, 83, 8, 96, 53, 51, 42,
98, 35, 36, 84, 43, 104, 31, 65, 1, 40, 9, 74, 95,
45, 5, 71, 86, 78, 30, 93, 48, 91, 15, 88, 39, 18,
57, 72, 70, 27, 54, 16, 24, 21, 14, 11, 77, 62, 50,
6, 105, 26, 55, 29, 60, 34, 13, 87, 59, 38, 99, 75,
106, 3, 82, 66, 79, 7, 46, 64, 81, 22, 68, 19, 102,
90, 100]
part2, devs2 = r.get_nodes('a', 'c', 'o2')
primary_zones2 = set([d['zone'] for d in devs2])
self.assertEquals(part2, exp_part2)
self.assertEquals([d['id'] for d in devs2], exp_devs2)
self.assertEquals(primary_zones2, exp_zones2)
devs2 = list(r.get_more_nodes(part2))
dev_ids2 = [d['id'] for d in devs2]
self.assertEquals(len(dev_ids2), len(exp_handoffs2))
for index, dev in enumerate(dev_ids2):
self.assertEquals(
dev, exp_handoffs2[index],
'handoff differs at position %d\n%s\n%s' % (
index, dev_ids2[index:], exp_handoffs2[index:]))
seen_zones = set(primary_zones2)
seen_zones.update([d['zone'] for d in devs2[:6]])
self.assertEquals(seen_zones, set(range(1, 10)))
# Test distribution across regions
rb.set_replicas(3)
for region in xrange(1, 5):
rb.add_dev({'id': next_dev_id,
'ip': '1.%d.1.%d' % (region, server), 'port': 1234,
# 108.0 is the weight of all devices created prior to
# this test in region 0; this way all regions have
# equal combined weight
'zone': 1, 'region': region, 'weight': 108.0})
next_dev_id += 1
rb.pretend_min_part_hours_passed()
rb.rebalance(seed=1)
rb.pretend_min_part_hours_passed()
rb.rebalance(seed=1)
rb.get_ring().save(self.testgz)
r = ring.Ring(self.testdir, ring_name='whatever')
# There's 5 regions now, so the primary nodes + first 2 handoffs
# should span all 5 regions
part, devs = r.get_nodes('a1', 'c1', 'o1')
primary_regions = set([d['region'] for d in devs])
primary_zones = set([(d['region'], d['zone']) for d in devs])
more_devs = list(r.get_more_nodes(part))
seen_regions = set(primary_regions)
seen_regions.update([d['region'] for d in more_devs[:2]])
self.assertEquals(seen_regions, set(range(0, 5)))
# There are 13 zones now, so the first 13 nodes should all have
# distinct zones (that's r0z0, r0z1, ..., r0z8, r1z1, r2z1, r3z1, and
# r4z1).
seen_zones = set(primary_zones)
seen_zones.update([(d['region'], d['zone']) for d in more_devs[:10]])
self.assertEquals(13, len(seen_zones))
# Here's a brittle canary-in-the-coalmine test to make sure the region
# handoff computation didn't change accidentally
exp_handoffs = [111, 112, 74, 54, 93, 31, 2, 43, 100, 22, 71, 92, 35,
9, 50, 41, 76, 80, 84, 88, 17, 96, 6, 102, 37, 29,
105, 5, 47, 20, 13, 108, 66, 81, 53, 65, 25, 58, 32,
94, 101, 1, 10, 44, 73, 75, 21, 97, 28, 106, 30, 16,
39, 77, 42, 72, 34, 99, 14, 61, 90, 4, 40, 3, 45, 62,
7, 15, 87, 12, 83, 89, 33, 98, 49, 107, 56, 86, 48,
57, 24, 11, 23, 26, 46, 64, 69, 38, 36, 79, 63, 104,
51, 70, 82, 67, 68, 8, 95, 91, 55, 59, 85]
dev_ids = [d['id'] for d in more_devs]
self.assertEquals(len(dev_ids), len(exp_handoffs))
for index, dev_id in enumerate(dev_ids):
self.assertEquals(
dev_id, exp_handoffs[index],
'handoff differs at position %d\n%s\n%s' % (
index, dev_ids[index:], exp_handoffs[index:]))
if __name__ == '__main__':
unittest.main()
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