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snapshot_test.py
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import distutils.dir_util
import glob
import os
import shutil
import subprocess
import time
import pytest
import logging
from cassandra.concurrent import execute_concurrent_with_args
from dtest_setup_overrides import DTestSetupOverrides
from dtest import Tester, create_ks
from tools.assertions import assert_one
from tools.files import replace_in_file, safe_mkdtemp
from tools.hacks import advance_to_next_cl_segment
from tools.misc import ImmutableMapping, get_current_test_name
since = pytest.mark.since
logger = logging.getLogger(__name__)
class SnapshotTester(Tester):
def create_schema(self, session):
create_ks(session, 'ks', 1)
session.execute('CREATE TABLE ks.cf ( key int PRIMARY KEY, val text);')
def insert_rows(self, session, start, end):
insert_statement = session.prepare("INSERT INTO ks.cf (key, val) VALUES (?, 'asdf')")
args = [(r,) for r in range(start, end)]
execute_concurrent_with_args(session, insert_statement, args, concurrency=20)
def make_snapshot(self, node, ks, cf, name):
logger.debug("Making snapshot....")
node.nodetool('disableautocompaction')
node.flush()
snapshot_cmd = 'snapshot {ks} -cf {cf} -t {name}'.format(ks=ks, cf=cf, name=name)
logger.debug("Running snapshot cmd: {snapshot_cmd}".format(snapshot_cmd=snapshot_cmd))
node.nodetool(snapshot_cmd)
tmpdir = safe_mkdtemp()
os.mkdir(os.path.join(tmpdir, ks))
os.mkdir(os.path.join(tmpdir, ks, cf))
# Find the snapshot dir, it's different in various C*
x = 0
for data_dir in node.data_directories():
snapshot_dir = "{data_dir}/{ks}/{cf}/snapshots/{name}".format(data_dir=data_dir, ks=ks, cf=cf, name=name)
if not os.path.isdir(snapshot_dir):
snapshot_dirs = glob.glob("{data_dir}/{ks}/{cf}-*/snapshots/{name}".format(data_dir=data_dir, ks=ks, cf=cf, name=name))
if len(snapshot_dirs) > 0:
snapshot_dir = snapshot_dirs[0]
else:
continue
logger.debug("snapshot_dir is : " + snapshot_dir)
logger.debug("snapshot copy is : " + tmpdir)
# Copy files from the snapshot dir to existing temp dir
distutils.dir_util.copy_tree(str(snapshot_dir), os.path.join(tmpdir, str(x), ks, cf))
x += 1
return tmpdir
def restore_snapshot(self, snapshot_dir, node, ks, cf):
logger.debug("Restoring snapshot....")
for x in range(0, self.cluster.data_dir_count):
snap_dir = os.path.join(snapshot_dir, str(x), ks, cf)
if os.path.exists(snap_dir):
ip = node.address()
args = [node.get_tool('sstableloader'), '-d', ip, snap_dir]
p = subprocess.Popen(args, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
stdout, stderr = p.communicate()
exit_status = p.wait()
if exit_status != 0:
raise Exception("sstableloader command '%s' failed; exit status: %d'; stdout: %s; stderr: %s" %
(" ".join(args), exit_status, stdout.decode("utf-8"), stderr.decode("utf-8")))
def restore_snapshot_schema(self, snapshot_dir, node, ks, cf):
logger.debug("Restoring snapshot schema....")
for x in range(0, self.cluster.data_dir_count):
schema_path = os.path.join(snapshot_dir, str(x), ks, cf, 'schema.cql')
if os.path.exists(schema_path):
node.run_cqlsh(cmds="SOURCE '%s'" % schema_path)
class TestSnapshot(SnapshotTester):
def test_basic_snapshot_and_restore(self):
cluster = self.cluster
cluster.populate(1).start()
(node1,) = cluster.nodelist()
session = self.patient_cql_connection(node1)
self.create_schema(session)
self.insert_rows(session, 0, 100)
snapshot_dir = self.make_snapshot(node1, 'ks', 'cf', 'basic')
# Write more data after the snapshot, this will get thrown
# away when we restore:
self.insert_rows(session, 100, 200)
rows = session.execute('SELECT count(*) from ks.cf')
assert rows[0][0] == 200
# Drop the keyspace, make sure we have no data:
session.execute('DROP KEYSPACE ks')
self.create_schema(session)
rows = session.execute('SELECT count(*) from ks.cf')
assert rows[0][0] == 0
# Restore data from snapshot:
self.restore_snapshot(snapshot_dir, node1, 'ks', 'cf')
node1.nodetool('refresh ks cf')
rows = session.execute('SELECT count(*) from ks.cf')
# clean up
logger.debug("removing snapshot_dir: " + snapshot_dir)
shutil.rmtree(snapshot_dir)
assert rows[0][0] == 100
@since('3.0')
def test_snapshot_and_restore_drop_table_remove_dropped_column(self):
"""
@jira_ticket CASSANDRA-13730
Dropping table should clear entries in dropped_column table
"""
cluster = self.cluster
cluster.populate(1).start()
node1, = cluster.nodelist()
session = self.patient_cql_connection(node1)
# Create schema and insert some data
create_ks(session, 'ks', 1)
session.execute("CREATE TABLE ks.cf (k int PRIMARY KEY, a text, b text)")
session.execute("INSERT INTO ks.cf (k, a, b) VALUES (1, 'a', 'b')")
assert_one(session, "SELECT * FROM ks.cf", [1, "a", "b"])
# Take a snapshot and drop the column and then drop table
snapshot_dir = self.make_snapshot(node1, 'ks', 'cf', 'basic')
session.execute("ALTER TABLE ks.cf DROP b")
assert_one(session, "SELECT * FROM ks.cf", [1, "a"])
session.execute("DROP TABLE ks.cf")
# Restore schema and data from snapshot, data should be the same as input
self.restore_snapshot_schema(snapshot_dir, node1, 'ks', 'cf')
self.restore_snapshot(snapshot_dir, node1, 'ks', 'cf')
node1.nodetool('refresh ks cf')
assert_one(session, "SELECT * FROM ks.cf", [1, "a", "b"])
# Clean up
logger.debug("removing snapshot_dir: " + snapshot_dir)
shutil.rmtree(snapshot_dir)
@since('3.11')
def test_snapshot_and_restore_dropping_a_column(self):
"""
@jira_ticket CASSANDRA-13276
Can't load snapshots of tables with dropped columns.
"""
cluster = self.cluster
cluster.populate(1).start()
node1, = cluster.nodelist()
session = self.patient_cql_connection(node1)
# Create schema and insert some data
create_ks(session, 'ks', 1)
session.execute("CREATE TABLE ks.cf (k int PRIMARY KEY, a text, b text)")
session.execute("INSERT INTO ks.cf (k, a, b) VALUES (1, 'a', 'b')")
assert_one(session, "SELECT * FROM ks.cf", [1, "a", "b"])
# Drop a column
session.execute("ALTER TABLE ks.cf DROP b")
assert_one(session, "SELECT * FROM ks.cf", [1, "a"])
# Take a snapshot and drop the table
snapshot_dir = self.make_snapshot(node1, 'ks', 'cf', 'basic')
session.execute("DROP TABLE ks.cf")
# Restore schema and data from snapshot
self.restore_snapshot_schema(snapshot_dir, node1, 'ks', 'cf')
self.restore_snapshot(snapshot_dir, node1, 'ks', 'cf')
node1.nodetool('refresh ks cf')
assert_one(session, "SELECT * FROM ks.cf", [1, "a"])
# Clean up
logger.debug("removing snapshot_dir: " + snapshot_dir)
shutil.rmtree(snapshot_dir)
class TestArchiveCommitlog(SnapshotTester):
@pytest.fixture(scope='function', autouse=True)
def fixture_dtest_setup_overrides(self, dtest_config):
dtest_setup_overrides = DTestSetupOverrides()
dtest_setup_overrides.cluster_options = ImmutableMapping({'start_rpc': 'true'})
return dtest_setup_overrides
def make_snapshot(self, node, ks, cf, name):
logger.debug("Making snapshot....")
node.nodetool('disableautocompaction')
node.flush()
snapshot_cmd = 'snapshot {ks} -cf {cf} -t {name}'.format(ks=ks, cf=cf, name=name)
logger.debug("Running snapshot cmd: {snapshot_cmd}".format(snapshot_cmd=snapshot_cmd))
node.nodetool(snapshot_cmd)
tmpdirs = []
base_tmpdir = safe_mkdtemp()
data_dir_count = self.cluster.data_dir_count
if self.cluster.version() >= '4.0' and ks in ['system', 'system_schema']:
data_dir_count = 1
for x in range(0, data_dir_count):
tmpdir = os.path.join(base_tmpdir, str(x))
os.mkdir(tmpdir)
# Copy files from the snapshot dir to existing temp dir
distutils.dir_util.copy_tree(os.path.join(node.get_path(), 'data{0}'.format(x), ks), tmpdir)
tmpdirs.append(tmpdir)
return tmpdirs
def restore_snapshot(self, snapshot_dir, node, ks, cf, name):
logger.debug("Restoring snapshot for cf ....")
data_dir = os.path.join(node.get_path(), 'data{0}'.format(os.path.basename(snapshot_dir)))
cfs = [s for s in os.listdir(snapshot_dir) if s.startswith(cf + "-")]
if len(cfs) > 0:
cf_id = cfs[0]
glob_path = "{snapshot_dir}/{cf_id}/snapshots/{name}".format(snapshot_dir=snapshot_dir, cf_id=cf_id, name=name)
globbed = glob.glob(glob_path)
if len(globbed) > 0:
snapshot_dir = globbed[0]
if not os.path.exists(os.path.join(data_dir, ks)):
os.mkdir(os.path.join(data_dir, ks))
os.mkdir(os.path.join(data_dir, ks, cf_id))
logger.debug("snapshot_dir is : " + snapshot_dir)
distutils.dir_util.copy_tree(snapshot_dir, os.path.join(data_dir, ks, cf_id))
def test_archive_commitlog(self):
self.run_archive_commitlog(restore_point_in_time=False)
def test_archive_commitlog_with_active_commitlog(self):
"""
Copy the active commitlogs to the archive directory before restoration
"""
self.run_archive_commitlog(restore_point_in_time=False)
def test_dont_archive_commitlog(self):
"""
Run the archive commitlog test, but forget to add the restore commands
"""
self.run_archive_commitlog(restore_point_in_time=False, restore_archived_commitlog=False)
def test_archive_commitlog_point_in_time(self):
"""
Test archive commit log with restore_point_in_time setting
"""
self.run_archive_commitlog(restore_point_in_time=True)
def test_archive_commitlog_point_in_time_ln(self):
"""
Test archive commit log with restore_point_in_time setting
"""
self.run_archive_commitlog(restore_point_in_time=True, archive_command='ln')
@since('4.1')
def test_archive_commitlog_restore_skip_by_position(self):
"""
Test archive commit log not restored because of specified snapshot commit log position
"""
self.run_archive_commitlog(restore_point_in_time=True, specify_commitlog_position=True, archive_command='ln')
def run_archive_commitlog(self, restore_point_in_time=False, restore_archived_commitlog=True, specify_commitlog_position=False, archive_command='cp'):
"""
Run archive commit log restoration test
"""
cluster = self.cluster
cluster.populate(1)
(node1,) = cluster.nodelist()
# Create a temp directory for storing commitlog archives:
tmp_commitlog = safe_mkdtemp()
logger.debug("tmp_commitlog: " + tmp_commitlog)
# Edit commitlog_archiving.properties and set an archive
# command:
replace_in_file(os.path.join(node1.get_path(), 'conf', 'commitlog_archiving.properties'),
[(r'^archive_command=.*$', 'archive_command={archive_command} %path {tmp_commitlog}/%name'.format(
tmp_commitlog=tmp_commitlog, archive_command=archive_command))])
cluster.start()
session = self.patient_cql_connection(node1)
create_ks(session, 'ks', 1)
# Write until we get a new CL segment. This avoids replaying
# initialization mutations from startup into system tables when
# restoring snapshots. See CASSANDRA-11811.
advance_to_next_cl_segment(
session=session,
commitlog_dir=os.path.join(node1.get_path(), 'commitlogs')
)
session.execute('CREATE TABLE ks.cf ( key bigint PRIMARY KEY, val text);')
logger.debug("Writing first 30,000 rows...")
self.insert_rows(session, 0, 30000)
# Record when this first set of inserts finished:
insert_cutoff_times = [time.gmtime()]
# Delete all commitlog backups so far:
for f in glob.glob(tmp_commitlog + "/*"):
logger.debug('Removing {}'.format(f))
os.remove(f)
snapshot_dirs = self.make_snapshot(node1, 'ks', 'cf', 'basic')
if self.cluster.version() >= '3.0':
system_ks_snapshot_dirs = self.make_snapshot(node1, 'system_schema', 'keyspaces', 'keyspaces')
else:
system_ks_snapshot_dirs = self.make_snapshot(node1, 'system', 'schema_keyspaces', 'keyspaces')
if self.cluster.version() >= '3.0':
system_col_snapshot_dirs = self.make_snapshot(node1, 'system_schema', 'columns', 'columns')
else:
system_col_snapshot_dirs = self.make_snapshot(node1, 'system', 'schema_columns', 'columns')
if self.cluster.version() >= '3.0':
system_ut_snapshot_dirs = self.make_snapshot(node1, 'system_schema', 'types', 'usertypes')
else:
system_ut_snapshot_dirs = self.make_snapshot(node1, 'system', 'schema_usertypes', 'usertypes')
if self.cluster.version() >= '3.0':
system_cfs_snapshot_dirs = self.make_snapshot(node1, 'system_schema', 'tables', 'cfs')
else:
system_cfs_snapshot_dirs = self.make_snapshot(node1, 'system', 'schema_columnfamilies', 'cfs')
try:
# Write more data:
logger.debug("Writing second 30,000 rows...")
self.insert_rows(session, 30000, 60000)
node1.flush()
time.sleep(10)
# Record when this second set of inserts finished:
insert_cutoff_times.append(time.gmtime())
logger.debug("Writing final 5,000 rows...")
self.insert_rows(session, 60000, 65000)
# Record when the third set of inserts finished:
insert_cutoff_times.append(time.gmtime())
# Flush so we get an accurate view of commitlogs
node1.flush()
rows = session.execute('SELECT count(*) from ks.cf')
# Make sure we have the same amount of rows as when we snapshotted:
assert rows[0][0] == 65000
# Check that there are at least one commit log backed up that
# is not one of the active commit logs:
commitlog_dir = os.path.join(node1.get_path(), 'commitlogs')
logger.debug("node1 commitlog dir: " + commitlog_dir)
logger.debug("node1 commitlog dir contents: " + str(os.listdir(commitlog_dir)))
logger.debug("tmp_commitlog contents: " + str(os.listdir(tmp_commitlog)))
assert_directory_not_empty(tmp_commitlog, commitlog_dir)
cluster.flush()
cluster.compact()
node1.drain()
# Destroy the cluster
cluster.stop()
logger.debug("node1 commitlog dir contents after stopping: " + str(os.listdir(commitlog_dir)))
logger.debug("tmp_commitlog contents after stopping: " + str(os.listdir(tmp_commitlog)))
self.copy_logs(name=get_current_test_name() + "_pre-restore")
self.fixture_dtest_setup.cleanup_and_replace_cluster()
cluster = self.cluster
cluster.populate(1)
nodes = cluster.nodelist()
assert len(nodes) == 1
node1 = nodes[0]
# Restore schema from snapshots:
for system_ks_snapshot_dir in system_ks_snapshot_dirs:
if self.cluster.version() >= '3.0':
self.restore_snapshot(system_ks_snapshot_dir, node1, 'system_schema', 'keyspaces', 'keyspaces')
else:
self.restore_snapshot(system_ks_snapshot_dir, node1, 'system', 'schema_keyspaces', 'keyspaces')
for system_col_snapshot_dir in system_col_snapshot_dirs:
if self.cluster.version() >= '3.0':
self.restore_snapshot(system_col_snapshot_dir, node1, 'system_schema', 'columns', 'columns')
else:
self.restore_snapshot(system_col_snapshot_dir, node1, 'system', 'schema_columns', 'columns')
for system_ut_snapshot_dir in system_ut_snapshot_dirs:
if self.cluster.version() >= '3.0':
self.restore_snapshot(system_ut_snapshot_dir, node1, 'system_schema', 'types', 'usertypes')
else:
self.restore_snapshot(system_ut_snapshot_dir, node1, 'system', 'schema_usertypes', 'usertypes')
for system_cfs_snapshot_dir in system_cfs_snapshot_dirs:
if self.cluster.version() >= '3.0':
self.restore_snapshot(system_cfs_snapshot_dir, node1, 'system_schema', 'tables', 'cfs')
else:
self.restore_snapshot(system_cfs_snapshot_dir, node1, 'system', 'schema_columnfamilies', 'cfs')
for snapshot_dir in snapshot_dirs:
self.restore_snapshot(snapshot_dir, node1, 'ks', 'cf', 'basic')
cluster.start()
session = self.patient_cql_connection(node1)
node1.nodetool('refresh ks cf')
rows = session.execute('SELECT count(*) from ks.cf')
# Make sure we have the same amount of rows as when we snapshotted:
assert rows[0][0] == 30000
# Edit commitlog_archiving.properties. Remove the archive
# command and set a restore command and restore_directories:
if restore_archived_commitlog:
replace_in_file(os.path.join(node1.get_path(), 'conf', 'commitlog_archiving.properties'),
[(r'^archive_command=.*$', 'archive_command='),
(r'^restore_command=.*$', 'restore_command=cp -f %from %to'),
(r'^restore_directories=.*$', 'restore_directories={tmp_commitlog}'.format(
tmp_commitlog=tmp_commitlog))])
if restore_point_in_time:
restore_time = time.strftime("%Y:%m:%d %H:%M:%S", insert_cutoff_times[1])
replace_in_file(os.path.join(node1.get_path(), 'conf', 'commitlog_archiving.properties'),
[(r'^restore_point_in_time=.*$', 'restore_point_in_time={restore_time}'.format(restore_time=restore_time))])
if specify_commitlog_position:
# specify a high commit log position to skip replaying any commit log data
replace_in_file(os.path.join(node1.get_path(), 'conf', 'commitlog_archiving.properties'),
[(r'^snapshot_commitlog_position=.*$', 'snapshot_commitlog_position={cl_position}'.format(cl_position="9223372036854775807, 0"))])
logger.debug("Restarting node1..")
node1.stop()
node1.start(wait_for_binary_proto=True)
node1.nodetool('flush')
node1.nodetool('compact')
session = self.patient_cql_connection(node1)
rows = session.execute('SELECT count(*) from ks.cf')
# Now we should have 30000 rows from the snapshot + 30000 rows
# from the commitlog backups:
if not restore_archived_commitlog or specify_commitlog_position:
assert rows[0][0] == 30000
elif restore_point_in_time:
assert rows[0][0] == 60000
else:
assert rows[0][0] == 65000
finally:
# clean up
logger.debug("removing snapshot_dir: " + ",".join(snapshot_dirs))
for snapshot_dir in snapshot_dirs:
shutil.rmtree(snapshot_dir)
logger.debug("removing snapshot_dir: " + ",".join(system_ks_snapshot_dirs))
for system_ks_snapshot_dir in system_ks_snapshot_dirs:
shutil.rmtree(system_ks_snapshot_dir)
logger.debug("removing snapshot_dir: " + ",".join(system_cfs_snapshot_dirs))
for system_cfs_snapshot_dir in system_cfs_snapshot_dirs:
shutil.rmtree(system_cfs_snapshot_dir)
logger.debug("removing snapshot_dir: " + ",".join(system_ut_snapshot_dirs))
for system_ut_snapshot_dir in system_ut_snapshot_dirs:
shutil.rmtree(system_ut_snapshot_dir)
logger.debug("removing snapshot_dir: " + ",".join(system_col_snapshot_dirs))
for system_col_snapshot_dir in system_col_snapshot_dirs:
shutil.rmtree(system_col_snapshot_dir)
logger.debug("removing tmp_commitlog: " + tmp_commitlog)
shutil.rmtree(tmp_commitlog)
def test_archive_and_restore_commitlog_repeatedly(self):
"""
@jira_ticket CASSANDRA-10593
Run archive commit log restoration test repeatedly to make sure it is idempotent
and doesn't fail if done repeatedly
"""
cluster = self.cluster
cluster.populate(1)
node1 = cluster.nodelist()[0]
# Create a temp directory for storing commitlog archives:
tmp_commitlog = safe_mkdtemp()
logger.debug("tmp_commitlog: {}".format(tmp_commitlog))
# Edit commitlog_archiving.properties and set an archive
# command:
replace_in_file(os.path.join(node1.get_path(), 'conf', 'commitlog_archiving.properties'),
[(r'^archive_command=.*$', 'archive_command=ln %path {tmp_commitlog}/%name'.format(
tmp_commitlog=tmp_commitlog)),
(r'^restore_command=.*$', 'restore_command=cp -f %from %to'),
(r'^restore_directories=.*$', 'restore_directories={tmp_commitlog}'.format(
tmp_commitlog=tmp_commitlog))])
cluster.start()
logger.debug("Creating initial connection")
session = self.patient_cql_connection(node1)
create_ks(session, 'ks', 1)
session.execute('CREATE TABLE ks.cf ( key bigint PRIMARY KEY, val text);')
logger.debug("Writing 30,000 rows...")
self.insert_rows(session, 0, 60000)
try:
# Check that there are at least one commit log backed up that
# is not one of the active commit logs:
commitlog_dir = os.path.join(node1.get_path(), 'commitlogs')
logger.debug("node1 commitlog dir: " + commitlog_dir)
cluster.flush()
assert_directory_not_empty(tmp_commitlog, commitlog_dir)
logger.debug("Flushing and doing first restart")
cluster.compact()
node1.drain()
# restart the node which causes the active commitlogs to be archived
node1.stop()
node1.start(wait_for_binary_proto=True)
logger.debug("Stopping and second restart")
node1.stop()
node1.start(wait_for_binary_proto=True)
# Shouldn't be any additional data since it's replaying the same stuff repeatedly
session = self.patient_cql_connection(node1)
rows = session.execute('SELECT count(*) from ks.cf')
assert rows[0][0] == 60000
finally:
logger.debug("removing tmp_commitlog: " + tmp_commitlog)
shutil.rmtree(tmp_commitlog)
def assert_directory_not_empty(tmp_commitlog, commitlog_dir):
commitlog_dir_ret = set(commitlog_dir)
for tmp_commitlog_file in set(os.listdir(tmp_commitlog)):
commitlog_dir_ret.discard(tmp_commitlog_file)
assert len(commitlog_dir_ret) != 0