def test_sync_uses_correct_connection(self):
"""This tests for a bug found during a rollout. The connection for the
metadata was assumed to be the same connection as the source data was
going to be coming from. This is *not* always the case.
"""
# To test this a migration from new to old will expose the bug
api.set_shard_at_rest('dummy', 1, "dest2/test_sharding")
api.start_migration('dummy', 1, "dest1/test_sharding")
# Mimic the state the shard would be in after a document was copied
# from one location to another
doc1 = {'x': 1, 'y': 1}
doc1['_id'] = self.db1.dummy.insert(doc1)
self.db2.dummy.insert(doc1)
# Get the initial oplog position, do an update and then sync from the
# initial position
initial_oplog_pos = sharder._get_oplog_pos('dummy', 1)
self.db2.dummy.update({'x': 1}, {'$inc': {'y': 1}})
api.set_shard_to_migration_status('dummy', 1,
api.ShardStatus.MIGRATING_SYNC)
sharder._sync_from_oplog('dummy', 1, initial_oplog_pos)
# The data on the first database should now reflect the update that
# went through
doc2, = self.db1.dummy.find({})
self.assertEquals(2, doc2['y'])
def test_sync_uses_correct_connection(self):
"""This tests for a bug found during a rollout. The connection for the
metadata was assumed to be the same connection as the source data was
going to be coming from. This is *not* always the case.
"""
# To test this a migration from new to old will expose the bug
api.set_shard_at_rest('dummy', 1, "dest2/test_sharding")
api.start_migration('dummy', 1, "dest1/test_sharding")
# Mimic the state the shard would be in after a document was copied
# from one location to another
doc1 = {'x': 1, 'y': 1}
doc1['_id'] = self.db1.dummy.insert(doc1)
self.db2.dummy.insert(doc1)
# Get the initial oplog position, do an update and then sync from the
# initial position
initial_oplog_pos = sharder._get_oplog_pos('dummy', 1)
self.db2.dummy.update({'x': 1}, {'$inc': {'y': 1}})
api.set_shard_to_migration_status(
'dummy', 1, api.ShardStatus.MIGRATING_SYNC)
sharder._sync_from_oplog('dummy', 1, initial_oplog_pos)
# The data on the first database should now reflect the update that
# went through
doc2, = self.db1.dummy.find({})
self.assertEquals(2, doc2['y'])
def test_sync_after_copy(self):
api.set_shard_at_rest("dummy", 1, "dest1/test_sharding")
api.start_migration("dummy", 1, "dest2/test_sharding")
# Mimic the state the shard would be in after a document was copied
# from one location to another
doc1 = {"x": 1, "y": 1}
doc1["_id"] = self.db1.dummy.insert(doc1)
self.db2.dummy.insert(doc1)
# Get the initial oplog position, do an update and then sync from the
# initial position
initial_oplog_pos = sharder._get_oplog_pos()
self.db1.dummy.update({"x": 1}, {"$inc": {"y": 1}})
api.set_shard_to_migration_status("dummy", 1, api.ShardStatus.MIGRATING_SYNC)
sharder._sync_from_oplog("dummy", 1, initial_oplog_pos)
# The data on the second database should now reflect the update that
# went through
doc2, = self.db2.dummy.find({})
self.assertEquals(2, doc2["y"])
def test_sync_after_copy(self):
api.set_shard_at_rest('dummy', 1, "dest1/test_sharding")
api.start_migration('dummy', 1, "dest2/test_sharding")
# Mimic the state the shard would be in after a document was copied
# from one location to another
doc1 = {'x': 1, 'y': 1}
doc1['_id'] = self.db1.dummy.insert(doc1)
self.db2.dummy.insert(doc1)
# Get the initial oplog position, do an update and then sync from the
# initial position
initial_oplog_pos = sharder._get_oplog_pos('dummy', 1)
self.db1.dummy.update({'x': 1}, {'$inc': {'y': 1}})
api.set_shard_to_migration_status('dummy', 1,
api.ShardStatus.MIGRATING_SYNC)
sharder._sync_from_oplog('dummy', 1, initial_oplog_pos)
# The data on the second database should now reflect the update that
# went through
doc2, = self.db2.dummy.find({})
self.assertEquals(2, doc2['y'])
def test_sync_ignores_other_collection(self):
api.set_shard_at_rest('dummy', 1, "dest1/test_sharding")
api.start_migration('dummy', 1, "dest2/test_sharding")
# Mimic the state the shard would be in after a document was copied
# from one location to another
doc1 = {'x': 1, 'y': 1}
doc1['_id'] = self.db1.dummy.insert(doc1)
self.db2.dummy.insert(doc1)
# Get the initial oplog position, do an update to a different collection
# and then sync from the initial position
initial_oplog_pos = sharder._get_oplog_pos('dummy', 1)
self.db1.other_coll.insert(doc1)
self.db1.other_coll.update({'x': 1}, {'$inc': {'y': 1}})
api.set_shard_to_migration_status(
'dummy', 1, api.ShardStatus.MIGRATING_SYNC)
sharder._sync_from_oplog('dummy', 1, initial_oplog_pos)
# The data on the second database should be in the same state as it
# was before
doc2, = self.db2.dummy.find({})
self.assertEquals(1, doc2['y'])
