swift/test/probe/test_reconstructor_rebuild.py
janonymous 09e7477a39 Replace it.next() with next(it) for py3 compat
The Python 2 next() method of iterators was renamed to __next__() on
Python 3. Use the builtin next() function instead which works on Python
2 and Python 3.

Change-Id: Ic948bc574b58f1d28c5c58e3985906dee17fa51d
2015-06-15 22:10:45 +05:30

228 lines
8.1 KiB
Python

#!/usr/bin/python -u
# 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 hashlib import md5
import unittest
import uuid
import shutil
import random
from collections import defaultdict
from test.probe.common import ECProbeTest
from swift.common import direct_client
from swift.common.storage_policy import EC_POLICY
from swift.common.manager import Manager
from swift.obj.reconstructor import _get_partners
from swiftclient import client
class Body(object):
def __init__(self, total=3.5 * 2 ** 20):
self.total = total
self.hasher = md5()
self.size = 0
self.chunk = 'test' * 16 * 2 ** 10
@property
def etag(self):
return self.hasher.hexdigest()
def __iter__(self):
return self
def next(self):
if self.size > self.total:
raise StopIteration()
self.size += len(self.chunk)
self.hasher.update(self.chunk)
return self.chunk
def __next__(self):
return next(self)
class TestReconstructorRebuild(ECProbeTest):
def setUp(self):
super(TestReconstructorRebuild, self).setUp()
self.container_name = 'container-%s' % uuid.uuid4()
self.object_name = 'object-%s' % uuid.uuid4()
# sanity
self.assertEqual(self.policy.policy_type, EC_POLICY)
self.reconstructor = Manager(["object-reconstructor"])
def proxy_get(self):
# GET object
headers, body = client.get_object(self.url, self.token,
self.container_name,
self.object_name,
resp_chunk_size=64 * 2 ** 10)
resp_checksum = md5()
for chunk in body:
resp_checksum.update(chunk)
return resp_checksum.hexdigest()
def direct_get(self, node, part):
req_headers = {'X-Backend-Storage-Policy-Index': int(self.policy)}
headers, data = direct_client.direct_get_object(
node, part, self.account, self.container_name,
self.object_name, headers=req_headers,
resp_chunk_size=64 * 2 ** 20)
hasher = md5()
for chunk in data:
hasher.update(chunk)
return hasher.hexdigest()
def _check_node(self, node, part, etag, headers_post):
# get fragment archive etag
fragment_archive_etag = self.direct_get(node, part)
# remove data from the selected node
part_dir = self.storage_dir('object', node, part=part)
shutil.rmtree(part_dir, True)
# this node can't servce the data any more
try:
self.direct_get(node, part)
except direct_client.DirectClientException as err:
self.assertEqual(err.http_status, 404)
else:
self.fail('Node data on %r was not fully destoryed!' %
(node,))
# make sure we can still GET the object and its correct, the
# proxy is doing decode on remaining fragments to get the obj
self.assertEqual(etag, self.proxy_get())
# fire up reconstructor
self.reconstructor.once()
# fragment is rebuilt exactly as it was before!
self.assertEqual(fragment_archive_etag,
self.direct_get(node, part))
# check meta
meta = client.head_object(self.url, self.token,
self.container_name,
self.object_name)
for key in headers_post:
self.assertTrue(key in meta)
self.assertEqual(meta[key], headers_post[key])
def _format_node(self, node):
return '%s#%s' % (node['device'], node['index'])
def test_main(self):
# create EC container
headers = {'X-Storage-Policy': self.policy.name}
client.put_container(self.url, self.token, self.container_name,
headers=headers)
# PUT object
contents = Body()
headers = {'x-object-meta-foo': 'meta-foo'}
headers_post = {'x-object-meta-bar': 'meta-bar'}
etag = client.put_object(self.url, self.token,
self.container_name,
self.object_name,
contents=contents, headers=headers)
client.post_object(self.url, self.token, self.container_name,
self.object_name, headers=headers_post)
del headers_post['X-Auth-Token'] # WTF, where did this come from?
# built up a list of node lists to kill data from,
# first try a single node
# then adjacent nodes and then nodes >1 node apart
opart, onodes = self.object_ring.get_nodes(
self.account, self.container_name, self.object_name)
single_node = [random.choice(onodes)]
adj_nodes = [onodes[0], onodes[-1]]
far_nodes = [onodes[0], onodes[-2]]
test_list = [single_node, adj_nodes, far_nodes]
for node_list in test_list:
for onode in node_list:
try:
self._check_node(onode, opart, etag, headers_post)
except AssertionError as e:
self.fail(
str(e) + '\n... for node %r of scenario %r' % (
self._format_node(onode),
[self._format_node(n) for n in node_list]))
def test_rebuild_partner_down(self):
# create EC container
headers = {'X-Storage-Policy': self.policy.name}
client.put_container(self.url, self.token, self.container_name,
headers=headers)
# PUT object
contents = Body()
client.put_object(self.url, self.token,
self.container_name,
self.object_name,
contents=contents)
opart, onodes = self.object_ring.get_nodes(
self.account, self.container_name, self.object_name)
# find a primary server that only has one of it's devices in the
# primary node list
group_nodes_by_config = defaultdict(list)
for n in onodes:
group_nodes_by_config[self.config_number(n)].append(n)
for config_number, node_list in group_nodes_by_config.items():
if len(node_list) == 1:
break
else:
self.fail('ring balancing did not use all available nodes')
primary_node = node_list[0]
# pick one it's partners to fail randomly
partner_node = random.choice(_get_partners(
primary_node['index'], onodes))
# 507 the partner device
device_path = self.device_dir('object', partner_node)
self.kill_drive(device_path)
# select another primary sync_to node to fail
failed_primary = [n for n in onodes if n['id'] not in
(primary_node['id'], partner_node['id'])][0]
# ... capture it's fragment etag
failed_primary_etag = self.direct_get(failed_primary, opart)
# ... and delete it
part_dir = self.storage_dir('object', failed_primary, part=opart)
shutil.rmtree(part_dir, True)
# reconstruct from the primary, while one of it's partners is 507'd
self.reconstructor.once(number=self.config_number(primary_node))
# the other failed primary will get it's fragment rebuilt instead
self.assertEqual(failed_primary_etag,
self.direct_get(failed_primary, opart))
# just to be nice
self.revive_drive(device_path)
if __name__ == "__main__":
unittest.main()