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disk_balance_test.py
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import os
import os.path
import re
from time import sleep
import pytest
import logging
from ccmlib.node import Node
from dtest import Tester, create_ks
from tools.assertions import assert_almost_equal
from tools.data import create_c1c2_table, insert_c1c2, query_c1c2
from tools.jmxutils import (JolokiaAgent, make_mbean)
from tools.misc import new_node
from compaction_test import grep_sstables_in_each_level
since = pytest.mark.since
logger = logging.getLogger(__name__)
@since('3.2')
class TestDiskBalance(Tester):
"""
@jira_ticket CASSANDRA-6696
"""
STCS_COMPACTION_OPTS = "SizeTieredCompactionStrategy"
LCS_COMPACTION_OPTS = "LeveledCompactionStrategy,sstable_size_in_mb=1"
UCS_COMPACTION_OPTS = "UnifiedCompactionStrategy"
@pytest.fixture(scope='function', autouse=True)
def fixture_set_cluster_settings(self, fixture_dtest_setup):
cluster = fixture_dtest_setup.cluster
cluster.schema_event_refresh_window = 0
# CASSANDRA-14556 should be disabled if you need directories to be perfectly balanced.
if cluster.version() >= '4.0':
cluster.set_configuration_options({'stream_entire_sstables': 'false'})
def test_disk_balance_stress(self):
cluster = self.cluster
if self.dtest_config.use_vnodes:
cluster.set_configuration_options(values={'num_tokens': 256})
cluster.populate(4).start()
node1 = cluster.nodes['node1']
node1.stress(['write', 'n=50k', 'no-warmup', '-rate', 'threads=100', '-schema', 'replication(factor=3)',
'compaction(strategy=SizeTieredCompactionStrategy,enabled=false)'])
cluster.flush()
cluster.stop()
# make sure the data directories are balanced:
for node in cluster.nodelist():
self.assert_balanced(node)
@pytest.mark.resource_intensive
def test_disk_balance_bootstrap(self):
cluster = self.cluster
if self.dtest_config.use_vnodes:
cluster.set_configuration_options(values={'num_tokens': 256})
# apparently we have legitimate errors in the log when bootstrapping (see bootstrap_test.py)
self.fixture_dtest_setup.allow_log_errors = True
cluster.populate(4).start()
node1 = cluster.nodes['node1']
node1.stress(['write', 'n=50k', 'no-warmup', '-rate', 'threads=100', '-schema', 'replication(factor=3)',
'compaction(strategy=SizeTieredCompactionStrategy,enabled=false)'])
cluster.flush()
node5 = new_node(cluster, data_center="dc1")
node5.start(wait_for_binary_proto=True)
self.assert_balanced(node5)
def test_disk_balance_replace_same_address(self):
self._test_disk_balance_replace(same_address=True)
def test_disk_balance_replace_different_address(self):
self._test_disk_balance_replace(same_address=False)
def _test_disk_balance_replace(self, same_address):
logger.debug("Creating cluster")
cluster = self.cluster
if self.dtest_config.use_vnodes:
cluster.set_configuration_options(values={'num_tokens': 256})
# apparently we have legitimate errors in the log when bootstrapping (see bootstrap_test.py)
self.fixture_dtest_setup.allow_log_errors = True
cluster.populate(4).start()
node1 = cluster.nodes['node1']
logger.debug("Populating")
node1.stress(['write', 'n=50k', 'no-warmup', '-rate', 'threads=100', '-schema', 'replication(factor=3)', 'compaction(strategy=SizeTieredCompactionStrategy,enabled=false)'])
cluster.flush()
logger.debug("Stopping and removing node2")
node2 = cluster.nodes['node2']
node2.stop(gently=False)
self.cluster.remove(node2)
node5_address = node2.address() if same_address else '127.0.0.5'
logger.debug("Starting replacement node")
node5 = Node('node5', cluster=self.cluster, auto_bootstrap=True,
thrift_interface=None, storage_interface=(node5_address, 7000),
jmx_port='7500', remote_debug_port='0', initial_token=None,
binary_interface=(node5_address, 9042))
self.cluster.add(node5, False, data_center="dc1")
node5.start(jvm_args=["-Dcassandra.replace_address_first_boot={}".format(node2.address())],
wait_for_binary_proto=180,
wait_other_notice=True)
logger.debug("Checking replacement node is balanced")
self.assert_balanced(node5)
def test_disk_balance_decommission(self):
cluster = self.cluster
if self.dtest_config.use_vnodes:
cluster.set_configuration_options(values={'num_tokens': 256})
cluster.populate(4).start()
node1 = cluster.nodes['node1']
node4 = cluster.nodes['node4']
node1.stress(['write', 'n=50k', 'no-warmup', '-rate', 'threads=100', '-schema', 'replication(factor=2)',
'compaction(strategy=SizeTieredCompactionStrategy,enabled=false)'])
cluster.flush()
node4.decommission()
for node in cluster.nodelist():
node.nodetool('relocatesstables')
for node in cluster.nodelist():
self.assert_balanced(node)
def test_blacklisted_directory(self):
cluster = self.cluster
cluster.set_datadir_count(3)
cluster.populate(1)
[node] = cluster.nodelist()
cluster.start()
session = self.patient_cql_connection(node)
create_ks(session, 'ks', 1)
create_c1c2_table(self, session)
insert_c1c2(session, n=10000)
node.flush()
for k in range(0, 10000):
query_c1c2(session, k)
node.compact()
mbean = make_mbean('db', type='BlacklistedDirectories')
with JolokiaAgent(node) as jmx:
jmx.execute_method(mbean, 'markUnwritable', [os.path.join(node.get_path(), 'data1')])
for k in range(0, 10000):
query_c1c2(session, k)
node.nodetool('relocatesstables')
for k in range(0, 10000):
query_c1c2(session, k)
def test_alter_replication_factor(self):
cluster = self.cluster
if self.dtest_config.use_vnodes:
cluster.set_configuration_options(values={'num_tokens': 256})
cluster.populate(3).start()
node1 = cluster.nodes['node1']
node1.stress(['write', 'n=1', 'no-warmup', '-rate', 'threads=100', '-schema', 'replication(factor=1)'])
cluster.flush()
session = self.patient_cql_connection(node1)
session.execute("ALTER KEYSPACE keyspace1 WITH replication = {'class':'SimpleStrategy', 'replication_factor':2}")
node1.stress(['write', 'n=100k', 'no-warmup', '-rate', 'threads=100'])
cluster.flush()
for node in cluster.nodelist():
self.assert_balanced(node)
def assert_balanced(self, node):
old_sums = new_sums = None
# This extra looping and logic is to account for a race with obsolete file deletions, which are scheduled
# asynchronously in the server. We want to allow a chance to settle if files are still being removed
for _ in range(20):
old_sums = new_sums
new_sums = []
for sstabledir in node.get_sstables_per_data_directory('keyspace1', 'standard1'):
sum = 0
for sstable in sstabledir:
sum = sum + os.path.getsize(sstable)
new_sums.append(sum)
if new_sums == old_sums:
break
sleep(2)
assert len(new_sums)
assert new_sums == old_sums # we settled
assert_almost_equal(*new_sums, error=0.1, error_message=node.name)
@since('3.10')
def test_disk_balance_after_boundary_change_stcs(self):
"""
@jira_ticket CASSANDRA-13948
"""
self._disk_balance_after_boundary_change_test(self.STCS_COMPACTION_OPTS)
@since('3.10')
def test_disk_balance_after_boundary_change_lcs(self):
"""
@jira_ticket CASSANDRA-13948
"""
self._disk_balance_after_boundary_change_test(self.LCS_COMPACTION_OPTS)
@since('4.0')
def test_disk_balance_after_boundary_change_ucs(self):
"""
@jira_ticket CASSANDRA-13948
"""
self._disk_balance_after_boundary_change_test(self.UCS_COMPACTION_OPTS)
def _disk_balance_after_boundary_change_test(self, compaction_opts):
"""
@jira_ticket CASSANDRA-13948
- Creates a 1 node cluster with 5 disks and insert data with compaction disabled
- Bootstrap a node2 to make disk boundary changes on node1
- Enable compaction on node1 and check disks are balanced
- Decommission node1 to make disk boundary changes on node2
- Enable compaction on node2 and check disks are balanced
"""
cluster = self.cluster
if self.dtest_config.use_vnodes:
cluster.set_configuration_options(values={'num_tokens': 1024})
num_disks = 5
cluster.set_datadir_count(num_disks)
cluster.set_configuration_options(values={'concurrent_compactors': num_disks})
logger.debug("Starting node1 with {} data dirs and concurrent_compactors".format(num_disks))
cluster.populate(1).start()
[node1] = cluster.nodelist()
session = self.patient_cql_connection(node1)
# reduce system_distributed RF to 1 so we don't require forceful decommission
session.execute("ALTER KEYSPACE system_distributed WITH REPLICATION = {'class':'SimpleStrategy', 'replication_factor':'1'};")
session.execute("ALTER KEYSPACE system_traces WITH REPLICATION = {'class':'SimpleStrategy', 'replication_factor':'1'};")
num_flushes = 10
keys_per_flush = 10000
keys_to_write = num_flushes * keys_per_flush
logger.debug("Writing {} keys in {} flushes (compaction_opts={})".format(keys_to_write, num_flushes, compaction_opts))
total_keys = num_flushes * keys_per_flush
current_keys = 0
while current_keys < total_keys:
start_key = current_keys + 1
end_key = current_keys + keys_per_flush
logger.debug("Writing keys {}..{} and flushing".format(start_key, end_key))
node1.stress(['write', 'n={}'.format(keys_per_flush), "no-warmup", "cl=ALL", "-pop",
"seq={}..{}".format(start_key, end_key), "-rate", "threads=1", "-schema", "replication(factor=1)",
"compaction(strategy={},enabled=false)".format(compaction_opts)])
node1.nodetool('flush keyspace1 standard1')
current_keys = end_key
# Add a new node, so disk boundaries will change
logger.debug("Bootstrap node2 and flush")
# Fixed initial token to bisect the ring and make sure the nodes are balanced (otherwise a random token is generated).
balanced_tokens = cluster.balanced_tokens(2)
assert self.dtest_config.use_vnodes or balanced_tokens[0] == node1.initial_token # make sure cluster population still works as assumed
node2 = new_node(cluster, token=balanced_tokens[1], bootstrap=True, data_center="dc1")
node2.set_configuration_options(values={'num_tokens': 1})
node2.start(wait_for_binary_proto=True, jvm_args=["-Dcassandra.migration_task_wait_in_seconds=10"], set_migration_task=False)
node2.flush()
self._assert_balanced_after_boundary_change(node1, total_keys, compaction_opts)
logger.debug("Decommissioning node1")
node1.decommission()
node1.stop()
self._assert_balanced_after_boundary_change(node2, total_keys, compaction_opts)
@since('3.10')
def test_disk_balance_after_joining_ring_stcs(self):
"""
@jira_ticket CASSANDRA-13948
"""
self._disk_balance_after_joining_ring_test(self.STCS_COMPACTION_OPTS)
@since('3.10')
def test_disk_balance_after_joining_ring_lcs(self):
"""
@jira_ticket CASSANDRA-13948
"""
self._disk_balance_after_joining_ring_test(self.LCS_COMPACTION_OPTS)
@since('4.0')
def test_disk_balance_after_joining_ring_ucs(self):
"""
@jira_ticket CASSANDRA-13948
"""
self._disk_balance_after_joining_ring_test(self.UCS_COMPACTION_OPTS)
def _disk_balance_after_joining_ring_test(self, compaction_opts):
"""
@jira_ticket CASSANDRA-13948
- Creates a 3 node cluster with 5 disks and insert data with compaction disabled
- Stop node1
- Start node1 without joining gossip and loading ring state so disk boundaries will not reflect actual ring state
- Join node1 to the ring to make disk boundaries change
- Enable compaction on node1 and check disks are balanced
"""
cluster = self.cluster
if self.dtest_config.use_vnodes:
cluster.set_configuration_options(values={'num_tokens': 1024})
num_disks = 5
cluster.set_datadir_count(num_disks)
cluster.set_configuration_options(values={'concurrent_compactors': num_disks})
logger.debug("Starting 3 nodes with {} data dirs and concurrent_compactors".format(num_disks))
cluster.populate(3).start()
node1 = cluster.nodelist()[0]
num_flushes = 10
keys_per_flush = 10000
keys_to_write = num_flushes * keys_per_flush
logger.debug("Writing {} keys in {} flushes (compaction_opts={})".format(keys_to_write, num_flushes, compaction_opts))
total_keys = num_flushes * keys_per_flush
current_keys = 0
while current_keys < total_keys:
start_key = current_keys + 1
end_key = current_keys + keys_per_flush
logger.debug("Writing keys {}..{} and flushing".format(start_key, end_key))
node1.stress(['write', 'n={}'.format(keys_per_flush), "no-warmup", "cl=ALL", "-pop",
"seq={}..{}".format(start_key, end_key), "-rate", "threads=1", "-schema", "replication(factor=1)",
"compaction(strategy={},enabled=false)".format(compaction_opts)])
node1.nodetool('flush keyspace1 standard1')
current_keys = end_key
logger.debug("Stopping node1")
node1.stop()
logger.debug("Starting node1 without joining ring")
node1.start(wait_for_binary_proto=True, wait_other_notice=False, join_ring=False,
jvm_args=["-Dcassandra.load_ring_state=false", "-Dcassandra.write_survey=true"])
logger.debug("Joining node1 to the ring")
node1.nodetool("join")
node1.nodetool("join") # Need to run join twice - one to join ring, another to leave write survey mode
self._assert_balanced_after_boundary_change(node1, total_keys, compaction_opts)
def _assert_balanced_after_boundary_change(self, node, total_keys, compaction_opts):
logger.debug("Cleanup {}".format(node.name))
node.cleanup()
logger.debug("Enabling compactions on {} now that boundaries changed".format(node.name))
node.nodetool('enableautocompaction')
logger.debug("Waiting for compactions on {}".format(node.name))
node.wait_for_compactions()
logger.debug("Disabling compactions on {} should not block forever".format(node.name))
node.nodetool('disableautocompaction')
logger.debug("Major compact {} and check disks are balanced".format(node.name))
node.compact()
node.wait_for_compactions()
self.assert_balanced(node)
logger.debug("Reading data back ({} keys)".format(total_keys))
node.stress(['read', 'n={}'.format(total_keys), "no-warmup", "cl=ALL", "-pop", "seq=1...{}".format(total_keys), "-rate", "threads=1"])
if compaction_opts == self.LCS_COMPACTION_OPTS:
output = grep_sstables_in_each_level(node, "standard1")
logger.debug("SSTables in each level: {}".format(output))
# [0, ?/, 0, 0, 0, 0...]
p = re.compile(r'(\d+)(/\d+)?,\s(\d+).*')
m = p.search(output)
cs_count = int(m.group(1)) + int(m.group(3))
sstable_count = len(node.get_sstables('keyspace1', 'standard1'))
logger.debug("Checking that compaction strategy sstable # ({}) is equal to actual # ({})".format(cs_count, sstable_count))
assert sstable_count == cs_count
assert not node.grep_log("is already present on leveled manifest")