Erasure Code Reconstructor
This patch adds the erasure code reconstructor. It follows the
design of the replicator but:
- There is no notion of update() or update_deleted().
- There is a single job processor
- Jobs are processed partition by partition.
- At the end of processing a rebalanced or handoff partition, the
reconstructor will remove successfully reverted objects if any.
And various ssync changes such as the addition of reconstruct_fa()
function called from ssync_sender which performs the actual
reconstruction while sending the object to the receiver
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: Samuel Merritt <sam@swiftstack.com>
Co-Authored-By: Christian Schwede <christian.schwede@enovance.com>
Co-Authored-By: Yuan Zhou <yuan.zhou@intel.com>
blueprint ec-reconstructor
Change-Id: I7d15620dc66ee646b223bb9fff700796cd6bef51
This commit is contained in:
paul luse
258
test/probe/test_reconstructor_revert.py
Executable file
258
test/probe/test_reconstructor_revert.py
Executable file
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#!/usr/bin/python -u
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# Copyright (c) 2010-2012 OpenStack Foundation
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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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from hashlib import md5
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import unittest
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import uuid
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import os
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from test.probe.common import ECProbeTest
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from swift.common import direct_client
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from swift.common.storage_policy import EC_POLICY
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from swift.common.manager import Manager
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from swift.common.utils import renamer
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from swiftclient import client
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class Body(object):
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def __init__(self, total=3.5 * 2 ** 20):
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self.total = total
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self.hasher = md5()
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self.size = 0
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self.chunk = 'test' * 16 * 2 ** 10
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@property
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def etag(self):
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return self.hasher.hexdigest()
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def __iter__(self):
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return self
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def next(self):
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if self.size > self.total:
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raise StopIteration()
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self.size += len(self.chunk)
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self.hasher.update(self.chunk)
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return self.chunk
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def __next__(self):
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return self.next()
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class TestReconstructorRevert(ECProbeTest):
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def setUp(self):
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super(TestReconstructorRevert, self).setUp()
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self.container_name = 'container-%s' % uuid.uuid4()
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self.object_name = 'object-%s' % uuid.uuid4()
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# sanity
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self.assertEqual(self.policy.policy_type, EC_POLICY)
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self.reconstructor = Manager(["object-reconstructor"])
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def kill_drive(self, device):
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if os.path.ismount(device):
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os.system('sudo umount %s' % device)
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else:
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renamer(device, device + "X")
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def revive_drive(self, device):
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disabled_name = device + "X"
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if os.path.isdir(disabled_name):
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renamer(device + "X", device)
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else:
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os.system('sudo mount %s' % device)
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def proxy_get(self):
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# GET object
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headers, body = client.get_object(self.url, self.token,
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self.container_name,
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self.object_name,
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resp_chunk_size=64 * 2 ** 10)
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resp_checksum = md5()
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for chunk in body:
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resp_checksum.update(chunk)
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return resp_checksum.hexdigest()
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def direct_get(self, node, part):
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req_headers = {'X-Backend-Storage-Policy-Index': int(self.policy)}
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headers, data = direct_client.direct_get_object(
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node, part, self.account, self.container_name,
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self.object_name, headers=req_headers,
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resp_chunk_size=64 * 2 ** 20)
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hasher = md5()
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for chunk in data:
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hasher.update(chunk)
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return hasher.hexdigest()
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def test_revert_object(self):
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# create EC container
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headers = {'X-Storage-Policy': self.policy.name}
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client.put_container(self.url, self.token, self.container_name,
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headers=headers)
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# get our node lists
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opart, onodes = self.object_ring.get_nodes(
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self.account, self.container_name, self.object_name)
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hnodes = self.object_ring.get_more_nodes(opart)
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# kill 2 a parity count number of primary nodes so we can
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# force data onto handoffs, we do that by renaming dev dirs
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# to induce 507
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p_dev1 = self.device_dir('object', onodes[0])
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p_dev2 = self.device_dir('object', onodes[1])
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self.kill_drive(p_dev1)
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self.kill_drive(p_dev2)
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# PUT object
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contents = Body()
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headers = {'x-object-meta-foo': 'meta-foo'}
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headers_post = {'x-object-meta-bar': 'meta-bar'}
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client.put_object(self.url, self.token, self.container_name,
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self.object_name, contents=contents,
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headers=headers)
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client.post_object(self.url, self.token, self.container_name,
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self.object_name, headers=headers_post)
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del headers_post['X-Auth-Token'] # WTF, where did this come from?
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# these primaries can't servce the data any more, we expect 507
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# here and not 404 because we're using mount_check to kill nodes
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for onode in (onodes[0], onodes[1]):
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try:
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self.direct_get(onode, opart)
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except direct_client.DirectClientException as err:
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self.assertEqual(err.http_status, 507)
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else:
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self.fail('Node data on %r was not fully destoryed!' %
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(onode,))
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# now take out another primary
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p_dev3 = self.device_dir('object', onodes[2])
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self.kill_drive(p_dev3)
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# this node can't servce the data any more
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try:
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self.direct_get(onodes[2], opart)
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except direct_client.DirectClientException as err:
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self.assertEqual(err.http_status, 507)
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else:
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self.fail('Node data on %r was not fully destoryed!' %
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(onode,))
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# make sure we can still GET the object and its correct
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# we're now pulling from handoffs and reconstructing
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etag = self.proxy_get()
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self.assertEqual(etag, contents.etag)
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# rename the dev dirs so they don't 507 anymore
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self.revive_drive(p_dev1)
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self.revive_drive(p_dev2)
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self.revive_drive(p_dev3)
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# fire up reconstructor on handoff nodes only
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for hnode in hnodes:
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hnode_id = (hnode['port'] - 6000) / 10
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self.reconstructor.once(number=hnode_id)
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# first threee primaries have data again
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for onode in (onodes[0], onodes[2]):
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self.direct_get(onode, opart)
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# check meta
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meta = client.head_object(self.url, self.token,
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self.container_name,
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self.object_name)
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for key in headers_post:
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self.assertTrue(key in meta)
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self.assertEqual(meta[key], headers_post[key])
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# handoffs are empty
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for hnode in hnodes:
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try:
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self.direct_get(hnode, opart)
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except direct_client.DirectClientException as err:
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self.assertEqual(err.http_status, 404)
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else:
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self.fail('Node data on %r was not fully destoryed!' %
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(hnode,))
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def test_delete_propogate(self):
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# create EC container
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headers = {'X-Storage-Policy': self.policy.name}
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client.put_container(self.url, self.token, self.container_name,
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headers=headers)
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# get our node lists
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opart, onodes = self.object_ring.get_nodes(
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self.account, self.container_name, self.object_name)
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hnodes = self.object_ring.get_more_nodes(opart)
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p_dev2 = self.device_dir('object', onodes[1])
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# PUT object
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contents = Body()
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client.put_object(self.url, self.token, self.container_name,
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self.object_name, contents=contents)
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# now lets shut one down
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self.kill_drive(p_dev2)
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# delete on the ones that are left
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client.delete_object(self.url, self.token,
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self.container_name,
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self.object_name)
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# spot check a node
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try:
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self.direct_get(onodes[0], opart)
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except direct_client.DirectClientException as err:
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self.assertEqual(err.http_status, 404)
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else:
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self.fail('Node data on %r was not fully destoryed!' %
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(onodes[0],))
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# enable the first node again
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self.revive_drive(p_dev2)
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# propogate the delete...
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# fire up reconstructor on handoff nodes only
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for hnode in hnodes:
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hnode_id = (hnode['port'] - 6000) / 10
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self.reconstructor.once(number=hnode_id, override_devices=['sdb8'])
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# check the first node to make sure its gone
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try:
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self.direct_get(onodes[1], opart)
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except direct_client.DirectClientException as err:
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self.assertEqual(err.http_status, 404)
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else:
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self.fail('Node data on %r was not fully destoryed!' %
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(onodes[0]))
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# make sure proxy get can't find it
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try:
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self.proxy_get()
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except Exception as err:
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self.assertEqual(err.http_status, 404)
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else:
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self.fail('Node data on %r was not fully destoryed!' %
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(onodes[0]))
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if __name__ == "__main__":
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unittest.main()
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