def test_ha_remove_extra_disks(
grpc_controller, # NOQA
grpc_replica1,
grpc_replica2): # NOQA
address = grpc_controller.address
prepare_backup_dir(BACKUP_DIR)
open_replica(grpc_replica1)
replicas = grpc_controller.replica_list()
assert len(replicas) == 0
r1_url = grpc_replica1.url
v = grpc_controller.volume_start(replicas=[r1_url])
assert v.name == VOLUME_NAME
assert v.replicaCount == 1
replicas = grpc_controller.replica_list()
assert len(replicas) == 1
assert replicas[0].mode == "RW"
dev = get_blockdev(VOLUME_NAME)
wasted_data = random_string(128)
data_offset = 1024
verify_data(dev, data_offset, wasted_data)
# now replica1 contains extra data in a snapshot
cmd.snapshot_create(address)
cleanup_controller(grpc_controller)
open_replica(grpc_replica2)
replicas = grpc_controller.replica_list()
assert len(replicas) == 0
r2_url = grpc_replica2.url
v = grpc_controller.volume_start(replicas=[r2_url])
assert v.name == VOLUME_NAME
assert v.replicaCount == 1
replicas = grpc_controller.replica_list()
assert len(replicas) == 1
assert replicas[0].mode == "RW"
dev = get_blockdev(VOLUME_NAME)
data = random_string(128)
data_offset = 1024
verify_data(dev, data_offset, data)
r1 = grpc_replica1.replica_reload()
print(r1)
cmd.add_replica(address, r1_url)
wait_for_rebuild_complete(address)
verify_data(dev, data_offset, data)
def test_snapshot_tree_rebuild(
grpc_controller, # NOQA
grpc_replica1,
grpc_replica2): # NOQA
address = grpc_controller.address
offset = 0
length = 128
open_replica(grpc_replica1)
open_replica(grpc_replica2)
replicas = grpc_controller.replica_list()
assert len(replicas) == 0
r1_url = grpc_replica1.url
r2_url = grpc_replica2.url
v = grpc_controller.volume_start(replicas=[r1_url, r2_url])
assert v.name == VOLUME_NAME
assert v.replicaCount == 2
replicas = grpc_controller.replica_list()
assert len(replicas) == 2
assert replicas[0].mode == "RW"
assert replicas[1].mode == "RW"
dev = get_blockdev(VOLUME_NAME)
snap, snap_data = snapshot_tree_build(dev, address, ENGINE_NAME, offset,
length)
data = random_string(128)
data_offset = 1024
verify_data(dev, data_offset, data)
# Cleanup replica2
cleanup_replica(grpc_replica2)
verify_async(dev, 10, 128, 1)
verify_replica_state(grpc_controller, r2_url, "ERR")
verify_read(dev, data_offset, data)
grpc_controller.replica_delete(replicas[1].address)
# Rebuild replica2
open_replica(grpc_replica2)
cmd.add_replica(address, r2_url)
wait_for_rebuild_complete(address)
verify_async(dev, 10, 128, 1)
verify_replica_state(grpc_controller, r2_url, "RW")
snapshot_tree_verify(dev, address, ENGINE_NAME, offset, length, snap,
snap_data)
def test_replica_add_start(bin, grpc_controller_client, # NOQA
grpc_replica_client): # NOQA
open_replica(grpc_replica_client)
cmd = [bin, '--debug', '--url', grpc_controller_client.address,
'add-replica',
grpc_replica_client.url]
subprocess.check_call(cmd)
wait_for_rebuild_complete(grpc_controller_client.address)
volume = grpc_controller_client.volume_get()
assert volume.replicaCount == 1
def test_replica_add_rebuild(bin, grpc_controller_client, # NOQA
grpc_replica_client, # NOQA
grpc_replica_client2): # NOQA
open_replica(grpc_replica_client)
open_replica(grpc_replica_client2)
snap0 = "000"
snap1 = "001"
grpc_replica_client.replica_open()
createtime0 = getNow()
grpc_replica_client.replica_snapshot(
name=snap0, created=createtime0,
labels={"name": "snap0", "key": "value"})
createtime1 = getNow()
r = grpc_replica_client.replica_snapshot(
name=snap1, user_created=True, created=createtime1)
r2 = grpc_replica_client2.replica_get()
assert r.chain == ['volume-head-002.img',
'volume-snap-001.img',
'volume-snap-000.img']
assert r2.chain != ['volume-head-002.img',
'volume-snap-001.img',
'volume-snap-000.img']
grpc_replica_client.replica_close()
cmd = [bin, '--debug', '--url', grpc_controller_client.address,
'add-replica',
grpc_replica_client.url]
subprocess.check_call(cmd)
wait_for_rebuild_complete(grpc_controller_client.address)
volume = grpc_controller_client.volume_get()
assert volume.replicaCount == 1
cmd = [bin, '--debug', '--url', grpc_controller_client.address,
'add-replica',
grpc_replica_client2.url]
subprocess.check_call(cmd)
wait_for_rebuild_complete(grpc_controller_client.address)
volume = grpc_controller_client.volume_get()
assert volume.replicaCount == 2
replicas = grpc_controller_client.replica_list()
assert len(replicas) == 2
for r in replicas:
assert r.mode == 'RW'
cmd = [bin, '--debug', '--url', grpc_controller_client.address,
'snapshot', 'info']
output = subprocess.check_output(cmd)
info = json.loads(output)
# two existing snapshots and one system snapshot due to rebuild
# and volume-head
volumehead = "volume-head"
assert len(info) == 4
for name in info:
if name != snap0 and name != snap1 and name != volumehead:
snapreb = name
break
head_info = info[volumehead]
assert head_info["name"] == volumehead
assert head_info["parent"] == snapreb
assert not head_info["children"]
assert head_info["removed"] is False
assert head_info["usercreated"] is False
assert head_info["size"] == "0"
snapreb_info = info[snapreb]
assert snapreb_info["name"] == snapreb
assert snapreb_info["parent"] == snap1
assert volumehead in snapreb_info["children"]
assert snapreb_info["removed"] is False
assert snapreb_info["usercreated"] is False
assert snapreb_info["size"] == "0"
snap1_info = info[snap1]
assert snap1_info["name"] == snap1
assert snap1_info["parent"] == snap0
assert snapreb in snap1_info["children"]
assert snap1_info["removed"] is False
assert snap1_info["usercreated"] is True
assert snap1_info["created"] == createtime1
assert snap1_info["size"] == "0"
snap0_info = info[snap0]
assert snap0_info["name"] == snap0
assert snap0_info["parent"] == ""
assert snap1 in snap0_info["children"]
assert snap0_info["removed"] is False
assert snap0_info["usercreated"] is False
assert snap0_info["created"] == createtime0
assert snap0_info["size"] == "0"
assert snap0_info["labels"]["name"] == "snap0"
assert snap0_info["labels"]["key"] == "value"
def test_single_replica_expansion_failed(grpc_controller,
grpc_fixed_dir_replica1,
grpc_fixed_dir_replica2): # NOQA
"""
The test flow:
1. Write random data into the block device.
2. Create the 1st snapshot.
3. Create an empty directory using the tmp meta file path of
the expansion disk for replica1.
4. Try to expand the volume. replica1 will be directly marked as ERR state.
Finally the volume expansion should succeed.
5. Check the volume status, and if the expanded volume works fine:
r/w data then create the 2nd snapshot.
6. Rebuild replica1 and check the replica1 is expanded automatically.
7. Delete replica2 then check if the rebuilt replica1 works fine.
"""
address = grpc_controller.address
r1_url = grpc_fixed_dir_replica1.address
r2_url = grpc_fixed_dir_replica2.address
dev = get_dev(grpc_fixed_dir_replica1, grpc_fixed_dir_replica2,
grpc_controller)
replicas = grpc_controller.replica_list()
assert len(replicas) == 2
assert replicas[0].mode == "RW"
assert replicas[1].mode == "RW"
# the default size is 4MB, will expand it to 8MB
zero_char = b'\x00'.decode('utf-8')
# write the data to the original part then do expansion
data1_len = random_length(PAGE_SIZE)
data1 = Data(random.randrange(0, SIZE - 2 * PAGE_SIZE, PAGE_SIZE),
data1_len, random_string(data1_len))
snap1 = Snapshot(dev, data1, address)
disk_meta_tmp_1 = os.path.join(FIXED_REPLICA_PATH1,
EXPANSION_DISK_TMP_META_NAME)
os.mkdir(disk_meta_tmp_1)
# replica1 will fail to expand the size,
# then engine will directly mark it as ERR state.
# Finally, The volume expansion should succeed since replica2 works fine.
grpc_controller.volume_frontend_shutdown()
grpc_controller.volume_expand(EXPANDED_SIZE)
wait_for_volume_expansion(grpc_controller, EXPANDED_SIZE)
grpc_controller.volume_frontend_start(FRONTEND_TGT_BLOCKDEV)
volume_info = grpc_controller.volume_get()
assert volume_info.last_expansion_error != ""
assert volume_info.last_expansion_failed_at != ""
verify_replica_state(grpc_controller, r1_url, "ERR")
verify_replica_state(grpc_controller, r2_url, "RW")
expansion_disk_2 = os.path.join(FIXED_REPLICA_PATH2, EXPANSION_DISK_NAME)
disk_meta_tmp_2 = os.path.join(FIXED_REPLICA_PATH2,
EXPANSION_DISK_TMP_META_NAME)
assert os.path.exists(expansion_disk_2)
assert not os.path.exists(disk_meta_tmp_2)
# The meta info file should keep unchanged
replica_meta_file_2 = os.path.join(FIXED_REPLICA_PATH2,
REPLICA_META_FILE_NAME)
with open(replica_meta_file_2) as f:
replica_meta_2 = json.load(f)
assert replica_meta_2["Size"] == EXPANDED_SIZE
# Cleanup replica1 then check if replica2 works fine
cleanup_replica(grpc_fixed_dir_replica1)
verify_replica_state(grpc_controller, r1_url, "ERR")
grpc_controller.replica_delete(replicas[0].address)
snap1.verify_data()
data2_len = random_length(PAGE_SIZE)
data2 = Data(SIZE - PAGE_SIZE, data2_len, random_string(data2_len))
snap2 = Snapshot(dev, data2, address)
snap2.verify_data()
assert dev.readat(SIZE, SIZE) == zero_char * SIZE
# Rebuild replica1.
# The newly opened replica1 will be expanded automatically
open_replica(grpc_fixed_dir_replica1)
cmd.add_replica(address, grpc_fixed_dir_replica1.url)
wait_for_rebuild_complete(address)
r1 = grpc_fixed_dir_replica1.replica_get()
assert r1.size == EXPANDED_SIZE_STR
verify_replica_state(grpc_controller, r1_url, "RW")
replica_meta_file_1 = os.path.join(FIXED_REPLICA_PATH1,
REPLICA_META_FILE_NAME)
with open(replica_meta_file_1) as f:
replica_meta_1 = json.load(f)
assert replica_meta_1["Size"] == EXPANDED_SIZE
# Delete replica2 then check if the rebuilt replica1 works fine
cleanup_replica(grpc_fixed_dir_replica2)
verify_replica_state(grpc_controller, r2_url, "ERR")
grpc_controller.replica_delete(replicas[1].address)
data3_len = random_length(PAGE_SIZE)
data3 = Data(random.randrange(SIZE, EXPANDED_SIZE - PAGE_SIZE, PAGE_SIZE),
data3_len, random_string(data3_len))
snap3 = Snapshot(dev, data3, address)
snap1.verify_data()
snap2.verify_data()
snap3.verify_data()
assert \
dev.readat(SIZE, SIZE) == zero_char*(data3.offset-SIZE) + \
data3.content + zero_char*(EXPANDED_SIZE-data3.offset-data3.length)
def test_ha_single_replica_rebuild(
grpc_controller, # NOQA
grpc_replica1,
grpc_replica2): # NOQA
address = grpc_controller.address
open_replica(grpc_replica1)
open_replica(grpc_replica2)
replicas = grpc_controller.replica_list()
assert len(replicas) == 0
r1_url = grpc_replica1.url
r2_url = grpc_replica2.url
v = grpc_controller.volume_start(replicas=[r1_url, r2_url])
assert v.replicaCount == 2
replicas = grpc_controller.replica_list()
assert len(replicas) == 2
assert replicas[0].mode == "RW"
assert replicas[1].mode == "RW"
dev = get_blockdev(VOLUME_NAME)
data = random_string(128)
data_offset = 1024
verify_data(dev, data_offset, data)
# Cleanup replica2
cleanup_replica(grpc_replica2)
verify_async(dev, 10, 128, 1)
verify_replica_state(grpc_controller, r2_url, "ERR")
verify_read(dev, data_offset, data)
grpc_controller.replica_delete(replicas[1].address)
# Rebuild replica2
open_replica(grpc_replica2)
cmd.add_replica(address, r2_url)
wait_for_rebuild_complete(address)
verify_async(dev, 10, 128, 1)
verify_replica_state(grpc_controller, r2_url, "RW")
verify_read(dev, data_offset, data)
# WORKAROUND for unable to remove the parent of volume head
newsnap = cmd.snapshot_create(address)
info = cmd.snapshot_info(address)
assert len(info) == 3
sysnap = info[newsnap]["parent"]
assert info[sysnap]["parent"] == ""
assert newsnap in info[sysnap]["children"]
assert info[sysnap]["usercreated"] is False
assert info[sysnap]["removed"] is False
cmd.snapshot_purge(address)
wait_for_purge_completion(address)
info = cmd.snapshot_info(address)
assert len(info) == 2
assert info[newsnap] is not None
assert info[VOLUME_HEAD] is not None
def test_expansion_rollback_with_rebuild(grpc_controller,
grpc_fixed_dir_replica1,
grpc_fixed_dir_replica2): # NOQA
"""
The test flow:
1. Write random data into the block device.
2. Create the 1st snapshot.
3. Create an empty directory using the tmp meta file path of
the expansion disk for each replica.
This will fail the following expansion and trigger expansion rollback.
4. Try to expand the volume but fails. Then the automatic rollback will
be applied implicitly.
5. Check the volume status and if there are leftovers of
the failed expansion.
6. Check if the volume is still usable by r/w data,
then create the 2nd snapshot.
7. Retry expansion. It should succeed.
8. Verify the data and try data r/w.
9. Delete then rebuild the replica2.
Then rebuilt replica2 will be expanded automatically.
10. Delete the replica1 then check if the rebuilt replica2 works fine.
"""
address = grpc_controller.address
r1_url = grpc_fixed_dir_replica1.address
r2_url = grpc_fixed_dir_replica2.address
dev = get_dev(grpc_fixed_dir_replica1, grpc_fixed_dir_replica2,
grpc_controller)
replicas = grpc_controller.replica_list()
assert len(replicas) == 2
assert replicas[0].mode == "RW"
assert replicas[1].mode == "RW"
# the default size is 4MB, will expand it to 8MB
zero_char = b'\x00'.decode('utf-8')
original_data = zero_char * SIZE
# write the data to the original part then do expansion
data1_len = random_length(PAGE_SIZE)
data1 = Data(random.randrange(0, SIZE - 2 * PAGE_SIZE, PAGE_SIZE),
data1_len, random_string(data1_len))
snap1 = Snapshot(dev, data1, address)
# use the tmp meta file path of expansion disks to create empty directories
# so that the expansion disk meta data update will fail.
# Then expansion will fail and the rollback will be triggered.
disk_meta_tmp_1 = os.path.join(FIXED_REPLICA_PATH1,
EXPANSION_DISK_TMP_META_NAME)
disk_meta_tmp_2 = os.path.join(FIXED_REPLICA_PATH2,
EXPANSION_DISK_TMP_META_NAME)
os.mkdir(disk_meta_tmp_1)
os.mkdir(disk_meta_tmp_2)
# All replicas' expansion will fail
# then engine will do rollback automatically
grpc_controller.volume_frontend_shutdown()
grpc_controller.volume_expand(EXPANDED_SIZE)
wait_for_volume_expansion(grpc_controller, SIZE)
grpc_controller.volume_frontend_start(FRONTEND_TGT_BLOCKDEV)
# Expansion should fail but the expansion rollback should succeed
volume_info = grpc_controller.volume_get()
assert volume_info.last_expansion_error != ""
assert volume_info.last_expansion_failed_at != ""
verify_replica_state(grpc_controller, r1_url, "RW")
verify_replica_state(grpc_controller, r2_url, "RW")
# The invalid disk and head will be cleaned up automatically
# after the rollback
expansion_disk_1 = os.path.join(FIXED_REPLICA_PATH1, EXPANSION_DISK_NAME)
expansion_disk_2 = os.path.join(FIXED_REPLICA_PATH2, EXPANSION_DISK_NAME)
assert not os.path.exists(expansion_disk_1)
assert not os.path.exists(expansion_disk_2)
assert not os.path.exists(disk_meta_tmp_1)
assert not os.path.exists(disk_meta_tmp_2)
# The meta info file should keep unchanged
replica_meta_file_1 = os.path.join(FIXED_REPLICA_PATH1,
REPLICA_META_FILE_NAME)
replica_meta_file_2 = os.path.join(FIXED_REPLICA_PATH2,
REPLICA_META_FILE_NAME)
with open(replica_meta_file_1) as f:
replica_meta_1 = json.load(f)
assert replica_meta_1["Size"] == SIZE
with open(replica_meta_file_2) as f:
replica_meta_2 = json.load(f)
assert replica_meta_2["Size"] == SIZE
# try to check then write new data
snap1.verify_data()
data2_len = random_length(PAGE_SIZE)
data2 = Data(SIZE - PAGE_SIZE, data2_len, random_string(data2_len))
snap2 = Snapshot(dev, data2, address)
# Retry expansion
expand_volume_with_frontend(grpc_controller, EXPANDED_SIZE)
wait_and_check_volume_expansion(grpc_controller, EXPANDED_SIZE)
with open(replica_meta_file_1) as f:
replica_meta_1 = json.load(f)
assert replica_meta_1["Size"] == EXPANDED_SIZE
with open(replica_meta_file_2) as f:
replica_meta_2 = json.load(f)
assert replica_meta_2["Size"] == EXPANDED_SIZE
assert os.path.exists(expansion_disk_1)
assert os.path.exists(expansion_disk_2)
snap1.verify_data()
snap2.verify_data()
assert dev.readat(SIZE, SIZE) == zero_char * SIZE
data3_len = random_length(PAGE_SIZE)
data3 = Data(random.randrange(SIZE, EXPANDED_SIZE - PAGE_SIZE, PAGE_SIZE),
data3_len, random_string(data3_len))
snap3 = Snapshot(dev, data3, address)
snap1.verify_data()
snap2.verify_data()
snap3.verify_data()
assert \
dev.readat(SIZE, SIZE) == zero_char*(data3.offset-SIZE) + \
data3.content + zero_char*(EXPANDED_SIZE-data3.offset-data3.length)
# Delete replica2
cleanup_replica(grpc_fixed_dir_replica2)
verify_replica_state(grpc_controller, r2_url, "ERR")
grpc_controller.replica_delete(replicas[1].address)
# Rebuild replica2.
open_replica(grpc_fixed_dir_replica2)
# The newly opened replica2 will be expanded automatically
cmd.add_replica(address, grpc_fixed_dir_replica2.url)
wait_for_rebuild_complete(address)
verify_replica_state(grpc_controller, r2_url, "RW")
# Cleanup replica1 then check if the rebuilt replica2 works fine
cleanup_replica(grpc_fixed_dir_replica1)
verify_replica_state(grpc_controller, r1_url, "ERR")
grpc_controller.replica_delete(replicas[0].address)
assert \
dev.readat(0, SIZE) == \
original_data[0:data1.offset] + data1.content + \
original_data[data1.offset+data1.length:data2.offset] + \
data2.content + \
original_data[data2.offset+data2.length:]
assert \
dev.readat(SIZE, SIZE) == zero_char*(data3.offset-SIZE) + \
data3.content + zero_char*(EXPANDED_SIZE-data3.offset-data3.length)
data4_len = random_length(PAGE_SIZE)
data4 = Data(data1.offset, data4_len, random_string(data4_len))
snap4 = Snapshot(dev, data4, address)
snap4.verify_data()
def test_expansion_with_rebuild(
grpc_controller, # NOQA
grpc_replica1,
grpc_replica2): # NOQA
address = grpc_controller.address
dev = get_dev(grpc_replica1, grpc_replica2, grpc_controller)
replicas = grpc_controller.replica_list()
assert len(replicas) == 2
assert replicas[0].mode == "RW"
assert replicas[1].mode == "RW"
# the default size is 4MB, will expand it to 8MB
address = grpc_controller.address
zero_char = b'\x00'.decode('utf-8')
original_data = zero_char * SIZE
# write the data to the original part then do expansion
data1_len = random_length(PAGE_SIZE)
data1 = Data(random.randrange(0, SIZE - 2 * PAGE_SIZE, PAGE_SIZE),
data1_len, random_string(data1_len))
snap1 = Snapshot(dev, data1, address)
expand_volume_with_frontend(grpc_controller, EXPANDED_SIZE)
wait_and_check_volume_expansion(grpc_controller, EXPANDED_SIZE)
snap1.verify_data()
assert \
dev.readat(0, SIZE) == \
original_data[0:data1.offset] + data1.content + \
original_data[data1.offset+data1.length:]
assert dev.readat(SIZE, SIZE) == zero_char * SIZE
# write the data to both the original part and the expanded part
data2_len = random_length(PAGE_SIZE)
data2 = Data(SIZE - PAGE_SIZE, data2_len, random_string(data2_len))
snap2 = Snapshot(dev, data2, address)
data3_len = random_length(PAGE_SIZE)
data3 = Data(random.randrange(SIZE, EXPANDED_SIZE - PAGE_SIZE, PAGE_SIZE),
data3_len, random_string(data3_len))
snap3 = Snapshot(dev, data3, address)
snap1.verify_data()
snap2.verify_data()
snap3.verify_data()
assert \
dev.readat(SIZE, SIZE) == zero_char*(data3.offset-SIZE) + \
data3.content + zero_char*(EXPANDED_SIZE-data3.offset-data3.length)
# Cleanup replica2
cleanup_replica(grpc_replica2)
verify_replica_state(grpc_controller, grpc_replica2.address, "ERR")
grpc_controller.replica_delete(replicas[1].address)
# Rebuild replica2.
open_replica(grpc_replica2)
# The newly opened replica2 will be expanded automatically
cmd.add_replica(address, grpc_replica2.url)
wait_for_rebuild_complete(address)
verify_replica_state(grpc_controller, grpc_replica2.address, "RW")
# Cleanup replica1 then check if the rebuilt replica2 works fine
cleanup_replica(grpc_replica1)
verify_replica_state(grpc_controller, grpc_replica1.address, "ERR")
grpc_controller.replica_delete(replicas[0].address)
assert \
dev.readat(0, SIZE) == \
original_data[0:data1.offset] + data1.content + \
original_data[data1.offset+data1.length:data2.offset] + \
data2.content + \
original_data[data2.offset+data2.length:]
assert \
dev.readat(SIZE, SIZE) == zero_char*(data3.offset-SIZE) + \
data3.content + zero_char*(EXPANDED_SIZE-data3.offset-data3.length)
data4_len = random_length(PAGE_SIZE)
data4 = Data(data1.offset, data4_len, random_string(data4_len))
snap4 = Snapshot(dev, data4, address)
snap4.verify_data()
def test_ha_double_replica_rebuild(
grpc_controller, # NOQA
grpc_replica1,
grpc_replica2): # NOQA
open_replica(grpc_replica1)
open_replica(grpc_replica2)
replicas = grpc_controller.replica_list()
assert len(replicas) == 0
r1_url = grpc_replica1.url
r2_url = grpc_replica2.url
v = grpc_controller.volume_start(replicas=[r1_url, r2_url])
assert v.name == VOLUME_NAME
assert v.replicaCount == 2
replicas = grpc_controller.replica_list()
assert len(replicas) == 2
assert replicas[0].mode == "RW"
assert replicas[1].mode == "RW"
dev = get_blockdev(VOLUME_NAME)
data1 = random_string(128)
data1_offset = 1024
verify_data(dev, data1_offset, data1)
# Close replica2
r2 = grpc_replica2.replica_get()
assert r2.revisionCounter == 1
grpc_replica2.replica_close()
verify_async(dev, 10, 128, 1)
verify_replica_state(grpc_controller, r2_url, "ERR")
verify_read(dev, data1_offset, data1)
data2 = random_string(128)
data2_offset = 512
verify_data(dev, data2_offset, data2)
# Close replica1
r1 = grpc_replica1.replica_get()
assert r1.revisionCounter == 12 # 1 + 10 + 1
grpc_replica1.replica_close()
# Restart volume
cleanup_controller(grpc_controller)
replicas = grpc_controller.replica_list()
assert len(replicas) == 0
# NOTE the order is reversed here
r1_url = grpc_replica1.url
r2_url = grpc_replica2.url
v = grpc_controller.volume_start(replicas=[r2_url, r1_url])
assert v.replicaCount == 2
# replica2 is out because of lower revision counter
replicas = grpc_controller.replica_list()
assert len(replicas) == 2
assert replicas[0].mode == "ERR"
assert replicas[1].mode == "RW"
verify_read(dev, data1_offset, data1)
verify_read(dev, data2_offset, data2)
# Rebuild replica2
r2 = grpc_replica2.replica_get()
assert r2.revisionCounter == 1
grpc_replica2.replica_close()
grpc_controller.replica_delete(replicas[0].address)
cmd.add_replica(grpc_controller.address, r2_url)
wait_for_rebuild_complete(grpc_controller.address)
verify_async(dev, 10, 128, 1)
verify_replica_state(grpc_controller, r2_url, "RW")
verify_read(dev, data1_offset, data1)
verify_read(dev, data2_offset, data2)
r1 = grpc_replica1.replica_get()
r2 = grpc_replica2.replica_get()
assert r1.revisionCounter == 22 # 1 + 10 + 1 + 10
assert r2.revisionCounter == 22 # must be in sync with r1
