337 lines
14 KiB
Python
337 lines
14 KiB
Python
# Copyright (c) 2010-2011 OpenStack, LLC.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import os
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import unittest
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from shutil import rmtree
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from swift.common import exceptions
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from swift.common import ring
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from swift.common.ring import RingBuilder, RingData
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class TestRingBuilder(unittest.TestCase):
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def setUp(self):
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self.testdir = os.path.join(os.path.dirname(__file__),
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'ring_builder')
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rmtree(self.testdir, ignore_errors=1)
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os.mkdir(self.testdir)
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def tearDown(self):
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rmtree(self.testdir, ignore_errors=1)
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def test_init(self):
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rb = ring.RingBuilder(8, 3, 1)
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self.assertEquals(rb.part_power, 8)
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self.assertEquals(rb.replicas, 3)
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self.assertEquals(rb.min_part_hours, 1)
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self.assertEquals(rb.parts, 2**8)
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self.assertEquals(rb.devs, [])
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self.assertEquals(rb.devs_changed, False)
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self.assertEquals(rb.version, 0)
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def test_get_ring(self):
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rb = ring.RingBuilder(8, 3, 1)
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rb.add_dev({'id': 0, 'zone': 0, 'weight': 1, 'ip': '127.0.0.1',
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'port': 10000, 'device': 'sda1'})
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rb.add_dev({'id': 1, 'zone': 1, 'weight': 1, 'ip': '127.0.0.1',
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'port': 10001, 'device': 'sda1'})
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rb.add_dev({'id': 2, 'zone': 2, 'weight': 1, 'ip': '127.0.0.1',
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'port': 10002, 'device': 'sda1'})
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rb.add_dev({'id': 3, 'zone': 1, 'weight': 1, 'ip': '127.0.0.1',
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'port': 10004, 'device': 'sda1'})
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rb.remove_dev(1)
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rb.rebalance()
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r = rb.get_ring()
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self.assert_(isinstance(r, ring.RingData))
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r2 = rb.get_ring()
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self.assert_(r is r2)
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rb.rebalance()
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r3 = rb.get_ring()
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self.assert_(r3 is not r2)
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r4 = rb.get_ring()
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self.assert_(r3 is r4)
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def test_add_dev(self):
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rb = ring.RingBuilder(8, 3, 1)
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dev = \
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{'id': 0, 'zone': 0, 'weight': 1, 'ip': '127.0.0.1', 'port': 10000}
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rb.add_dev(dev)
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self.assertRaises(exceptions.DuplicateDeviceError, rb.add_dev, dev)
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def test_set_dev_weight(self):
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rb = ring.RingBuilder(8, 3, 1)
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rb.add_dev({'id': 0, 'zone': 0, 'weight': 0.5, 'ip': '127.0.0.1',
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'port': 10000, 'device': 'sda1'})
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rb.add_dev({'id': 1, 'zone': 0, 'weight': 0.5, 'ip': '127.0.0.1',
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'port': 10001, 'device': 'sda1'})
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rb.add_dev({'id': 2, 'zone': 1, 'weight': 1, 'ip': '127.0.0.1',
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'port': 10002, 'device': 'sda1'})
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rb.add_dev({'id': 3, 'zone': 2, 'weight': 1, 'ip': '127.0.0.1',
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'port': 10003, 'device': 'sda1'})
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rb.rebalance()
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r = rb.get_ring()
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counts = {}
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for part2dev_id in r._replica2part2dev_id:
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for dev_id in part2dev_id:
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counts[dev_id] = counts.get(dev_id, 0) + 1
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self.assertEquals(counts, {0: 128, 1: 128, 2: 256, 3: 256})
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rb.set_dev_weight(0, 0.75)
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rb.set_dev_weight(1, 0.25)
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rb.pretend_min_part_hours_passed()
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rb.rebalance()
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r = rb.get_ring()
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counts = {}
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for part2dev_id in r._replica2part2dev_id:
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for dev_id in part2dev_id:
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counts[dev_id] = counts.get(dev_id, 0) + 1
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self.assertEquals(counts, {0: 192, 1: 64, 2: 256, 3: 256})
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def test_remove_dev(self):
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rb = ring.RingBuilder(8, 3, 1)
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rb.add_dev({'id': 0, 'zone': 0, 'weight': 1, 'ip': '127.0.0.1',
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'port': 10000, 'device': 'sda1'})
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rb.add_dev({'id': 1, 'zone': 1, 'weight': 1, 'ip': '127.0.0.1',
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'port': 10001, 'device': 'sda1'})
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rb.add_dev({'id': 2, 'zone': 2, 'weight': 1, 'ip': '127.0.0.1',
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'port': 10002, 'device': 'sda1'})
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rb.add_dev({'id': 3, 'zone': 3, 'weight': 1, 'ip': '127.0.0.1',
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'port': 10003, 'device': 'sda1'})
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rb.rebalance()
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r = rb.get_ring()
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counts = {}
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for part2dev_id in r._replica2part2dev_id:
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for dev_id in part2dev_id:
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counts[dev_id] = counts.get(dev_id, 0) + 1
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self.assertEquals(counts, {0: 192, 1: 192, 2: 192, 3: 192})
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rb.remove_dev(1)
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rb.pretend_min_part_hours_passed()
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rb.rebalance()
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r = rb.get_ring()
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counts = {}
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for part2dev_id in r._replica2part2dev_id:
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for dev_id in part2dev_id:
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counts[dev_id] = counts.get(dev_id, 0) + 1
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self.assertEquals(counts, {0: 256, 2: 256, 3: 256})
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def test_remove_a_lot(self):
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rb = ring.RingBuilder(3, 3, 1)
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rb.add_dev({'id': 0, 'device': 'd0', 'ip': '10.0.0.1',
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'port': 6002, 'weight': 1000.0, 'zone': 1})
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rb.add_dev({'id': 1, 'device': 'd1', 'ip': '10.0.0.2',
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'port': 6002, 'weight': 1000.0, 'zone': 2})
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rb.add_dev({'id': 2, 'device': 'd2', 'ip': '10.0.0.3',
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'port': 6002, 'weight': 1000.0, 'zone': 3})
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rb.add_dev({'id': 3, 'device': 'd3', 'ip': '10.0.0.1',
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'port': 6002, 'weight': 1000.0, 'zone': 1})
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rb.add_dev({'id': 4, 'device': 'd4', 'ip': '10.0.0.2',
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'port': 6002, 'weight': 1000.0, 'zone': 2})
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rb.add_dev({'id': 5, 'device': 'd5', 'ip': '10.0.0.3',
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'port': 6002, 'weight': 1000.0, 'zone': 3})
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rb.rebalance()
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rb.validate()
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# this has to put more than 1/3 of the partitions in the
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# cluster on removed devices in order to ensure that at least
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# one partition has multiple replicas that need to move.
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#
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# (for an N-replica ring, it's more than 1/N of the
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# partitions, of course)
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rb.remove_dev(3)
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rb.remove_dev(4)
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rb.remove_dev(5)
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rb.rebalance()
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rb.validate()
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def test_shuffled_gather(self):
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if self._shuffled_gather_helper() and \
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self._shuffled_gather_helper():
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raise AssertionError('It is highly likely the ring is no '
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'longer shuffling the set of partitions to reassign on a '
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'rebalance.')
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def _shuffled_gather_helper(self):
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rb = ring.RingBuilder(8, 3, 1)
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rb.add_dev({'id': 0, 'zone': 0, 'weight': 1, 'ip': '127.0.0.1',
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'port': 10000, 'device': 'sda1'})
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rb.add_dev({'id': 1, 'zone': 1, 'weight': 1, 'ip': '127.0.0.1',
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'port': 10001, 'device': 'sda1'})
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rb.add_dev({'id': 2, 'zone': 2, 'weight': 1, 'ip': '127.0.0.1',
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'port': 10002, 'device': 'sda1'})
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rb.rebalance()
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rb.add_dev({'id': 3, 'zone': 3, 'weight': 1, 'ip': '127.0.0.1',
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'port': 10003, 'device': 'sda1'})
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rb.pretend_min_part_hours_passed()
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parts = rb._gather_reassign_parts()
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max_run = 0
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run = 0
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last_part = 0
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for part in parts:
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if part > last_part:
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run += 1
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else:
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if run > max_run:
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max_run = run
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run = 0
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last_part = part
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if run > max_run:
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max_run = run
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return max_run > len(parts) / 2
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def test_rerebalance(self):
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rb = ring.RingBuilder(8, 3, 1)
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rb.add_dev({'id': 0, 'zone': 0, 'weight': 1, 'ip': '127.0.0.1',
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'port': 10000, 'device': 'sda1'})
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rb.add_dev({'id': 1, 'zone': 1, 'weight': 1, 'ip': '127.0.0.1',
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'port': 10001, 'device': 'sda1'})
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rb.add_dev({'id': 2, 'zone': 2, 'weight': 1, 'ip': '127.0.0.1',
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'port': 10002, 'device': 'sda1'})
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rb.rebalance()
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r = rb.get_ring()
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counts = {}
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for part2dev_id in r._replica2part2dev_id:
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for dev_id in part2dev_id:
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counts[dev_id] = counts.get(dev_id, 0) + 1
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self.assertEquals(counts, {0: 256, 1: 256, 2: 256})
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rb.add_dev({'id': 3, 'zone': 3, 'weight': 1, 'ip': '127.0.0.1',
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'port': 10003, 'device': 'sda1'})
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rb.pretend_min_part_hours_passed()
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rb.rebalance()
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r = rb.get_ring()
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counts = {}
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for part2dev_id in r._replica2part2dev_id:
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for dev_id in part2dev_id:
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counts[dev_id] = counts.get(dev_id, 0) + 1
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self.assertEquals(counts, {0: 192, 1: 192, 2: 192, 3: 192})
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rb.set_dev_weight(3, 100)
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rb.rebalance()
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r = rb.get_ring()
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counts = {}
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for part2dev_id in r._replica2part2dev_id:
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for dev_id in part2dev_id:
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counts[dev_id] = counts.get(dev_id, 0) + 1
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self.assertEquals(counts[3], 256)
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def test_add_rebalance_add_rebalance_delete_rebalance(self):
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""" Test for https://bugs.launchpad.net/swift/+bug/845952 """
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# min_part of 0 to allow for rapid rebalancing
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rb = ring.RingBuilder(8, 3, 0)
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rb.add_dev({'id': 0, 'zone': 0, 'weight': 1, 'ip': '127.0.0.1',
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'port': 10000, 'device': 'sda1'})
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rb.add_dev({'id': 1, 'zone': 1, 'weight': 1, 'ip': '127.0.0.1',
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'port': 10001, 'device': 'sda1'})
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rb.add_dev({'id': 2, 'zone': 2, 'weight': 1, 'ip': '127.0.0.1',
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'port': 10002, 'device': 'sda1'})
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rb.rebalance()
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rb.add_dev({'id': 3, 'zone': 0, 'weight': 1, 'ip': '127.0.0.1',
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'port': 10003, 'device': 'sda1'})
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rb.add_dev({'id': 4, 'zone': 1, 'weight': 1, 'ip': '127.0.0.1',
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'port': 10004, 'device': 'sda1'})
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rb.add_dev({'id': 5, 'zone': 2, 'weight': 1, 'ip': '127.0.0.1',
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'port': 10005, 'device': 'sda1'})
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rb.rebalance()
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rb.remove_dev(1)
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rb.rebalance()
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def test_validate(self):
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rb = ring.RingBuilder(8, 3, 1)
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rb.add_dev({'id': 0, 'zone': 0, 'weight': 1, 'ip': '127.0.0.1',
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'port': 10000, 'device': 'sda1'})
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rb.add_dev({'id': 1, 'zone': 1, 'weight': 1, 'ip': '127.0.0.1',
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'port': 10001, 'device': 'sda1'})
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rb.add_dev({'id': 2, 'zone': 2, 'weight': 2, 'ip': '127.0.0.1',
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'port': 10002, 'device': 'sda1'})
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rb.add_dev({'id': 3, 'zone': 3, 'weight': 2, 'ip': '127.0.0.1',
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'port': 10003, 'device': 'sda1'})
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rb.rebalance()
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r = rb.get_ring()
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counts = {}
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for part2dev_id in r._replica2part2dev_id:
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for dev_id in part2dev_id:
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counts[dev_id] = counts.get(dev_id, 0) + 1
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self.assertEquals(counts, {0: 128, 1: 128, 2: 256, 3: 256})
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dev_usage, worst = rb.validate()
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self.assert_(dev_usage is None)
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self.assert_(worst is None)
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dev_usage, worst = rb.validate(stats=True)
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self.assertEquals(list(dev_usage), [128, 128, 256, 256])
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self.assertEquals(int(worst), 0)
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rb.set_dev_weight(2, 0)
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rb.rebalance()
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self.assertEquals(rb.validate(stats=True)[1], 999.99)
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# Test not all partitions doubly accounted for
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rb.devs[1]['parts'] -= 1
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self.assertRaises(exceptions.RingValidationError, rb.validate)
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rb.devs[1]['parts'] += 1
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# Test duplicate device for partition
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orig_dev_id = rb._replica2part2dev[0][0]
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rb._replica2part2dev[0][0] = rb._replica2part2dev[1][0]
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self.assertRaises(exceptions.RingValidationError, rb.validate)
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rb._replica2part2dev[0][0] = orig_dev_id
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# Test duplicate zone for partition
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rb.add_dev({'id': 5, 'zone': 0, 'weight': 2, 'ip': '127.0.0.1',
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'port': 10005, 'device': 'sda1'})
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rb.pretend_min_part_hours_passed()
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rb.rebalance()
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rb.validate()
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orig_replica = orig_partition = orig_device = None
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for part2dev in rb._replica2part2dev:
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for p in xrange(2**8):
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if part2dev[p] == 5:
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for r in xrange(len(rb._replica2part2dev)):
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if rb._replica2part2dev[r][p] != 5:
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orig_replica = r
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orig_partition = p
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orig_device = rb._replica2part2dev[r][p]
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rb._replica2part2dev[r][p] = 0
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break
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if orig_replica is not None:
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break
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if orig_replica is not None:
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break
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self.assertRaises(exceptions.RingValidationError, rb.validate)
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rb._replica2part2dev[orig_replica][orig_partition] = orig_device
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# Tests that validate can handle 'holes' in .devs
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rb.remove_dev(2)
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rb.pretend_min_part_hours_passed()
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rb.rebalance()
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rb.validate(stats=True)
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# Validate that zero weight devices with no partitions don't count on
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# the 'worst' value.
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self.assertNotEquals(rb.validate(stats=True)[1], 999.99)
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rb.add_dev({'id': 4, 'zone': 0, 'weight': 0, 'ip': '127.0.0.1',
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'port': 10004, 'device': 'sda1'})
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rb.pretend_min_part_hours_passed()
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rb.rebalance()
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self.assertNotEquals(rb.validate(stats=True)[1], 999.99)
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if __name__ == '__main__':
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unittest.main()
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