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ics_space_amplification_goal_test.py
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ics_space_amplification_goal_test.py
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# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
#
# See LICENSE for more details.
#
# Copyright (c) 2020 ScyllaDB
import math
import time
from textwrap import dedent
from longevity_test import LongevityTest
from sdcm.cluster import BaseNode
from sdcm.db_stats import AVAIL_SIZE_METRIC, AVAIL_SIZE_METRIC_OLD, GB_SIZE
from sdcm.sct_events.system import InfoEvent
from test_lib.compaction import CompactionStrategy, LOGGER
class IcsSpaceAmplificationTest(LongevityTest):
def _get_filesystem_available_size_list(self, node, start_time):
"""
:returns a list of file-system free-capacity on point in time from 'start_time' up to now.
"""
node_capacity_query_postfix = self.prometheus_db.generate_node_capacity_query_postfix(node)
available_capacity_query = f'{AVAIL_SIZE_METRIC}{node_capacity_query_postfix}'
available_size_res = self.prometheus_db.query(query=available_capacity_query, start=int(start_time),
end=int(time.time()))
assert available_size_res, "No results from Prometheus"
if not available_size_res[0]: # if no returned values - try the old metric names.
available_capacity_query = f'{AVAIL_SIZE_METRIC_OLD}{node_capacity_query_postfix}'
available_size_res = self.prometheus_db.query(query=available_capacity_query, start=int(start_time),
end=int(time.time()))
assert available_size_res[0], "Could not resolve available-size query result."
return available_size_res[0]["values"]
def _get_max_used_capacity_over_time_gb(self, node, start_time) -> float:
"""
:param node: DB node under test.
:param start_time: the start interval to search max-used-capacity from.
:return:
"""
fs_size_gb = self.prometheus_db.get_filesystem_total_size_gb(node=node)
end_time = time.time()
time_interval_minutes = int(math.ceil((end_time - start_time) / 60)) # convert time to minutes and round up.
min_available_capacity_gb = min(
[int(val[1]) for val in
self._get_filesystem_available_size_list(node=node, start_time=start_time)]) / GB_SIZE
max_used_capacity_gb = fs_size_gb - min_available_capacity_gb
self.log.debug("The maximum used filesystem capacity of %s for the last %s minutes is: %s GB/ %s GB",
node.private_ip_address, time_interval_minutes, max_used_capacity_gb, fs_size_gb)
return max_used_capacity_gb
def _get_nodes_space_ampl_over_time_gb(self, dict_nodes_initial_capacity, start_time,
written_data_size_gb=0):
dict_nodes_space_amplification = {}
dict_nodes_used_capacity = self._get_nodes_used_capacity()
for node in self.db_cluster.nodes:
node_initial_capacity = dict_nodes_initial_capacity[node.private_ip_address]
node_used_capacity = dict_nodes_used_capacity[node.private_ip_address]
node_max_used_capacity_gb = self._get_max_used_capacity_over_time_gb(node=node,
start_time=start_time)
dict_nodes_space_amplification[node.private_ip_address] = \
round(node_max_used_capacity_gb - written_data_size_gb - node_initial_capacity, 2)
self.log.info("Node %s used capacity changed from %s to %s.",
node.private_ip_address, node_initial_capacity, node_used_capacity)
self.log.info("Space amplification is: %s GB", dict_nodes_space_amplification[node.private_ip_address])
return dict_nodes_space_amplification
def measure_nodes_space_amplification_after_write(self, dict_nodes_initial_capacity, written_data_size_gb,
start_time):
dict_nodes_space_amplification = self._get_nodes_space_ampl_over_time_gb(
dict_nodes_initial_capacity=dict_nodes_initial_capacity,
written_data_size_gb=written_data_size_gb, start_time=start_time)
self.log.info("Space amplification results after a write of: %s are: %s",
written_data_size_gb, dict_nodes_space_amplification)
InfoEvent(message=f"Space amplification results after a write of: {written_data_size_gb} are: "
f"{dict_nodes_space_amplification}").publish()
def _get_nodes_used_capacity(self) -> dict:
"""
:rtype: dictionary with capacity per node-ip
"""
dict_nodes_used_capacity = {}
for node in self.db_cluster.nodes:
dict_nodes_used_capacity[node.private_ip_address] = self.prometheus_db.get_used_capacity_gb(node=node)
return dict_nodes_used_capacity
def _alter_table_compaction(self, compaction_strategy=CompactionStrategy.INCREMENTAL, table_name='standard1',
keyspace_name='keyspace1',
additional_compaction_params: dict = None):
"""
Alters table compaction like: ALTER TABLE mykeyspace.mytable WITH
compaction = {'class' : 'IncrementalCompactionStrategy'}
"""
base_query = f"ALTER TABLE {keyspace_name}.{table_name} WITH compaction = "
dict_requested_compaction = {'class': compaction_strategy.value}
if additional_compaction_params:
dict_requested_compaction.update(additional_compaction_params)
full_alter_query = base_query + str(dict_requested_compaction)
LOGGER.debug("Alter table query is: %s", full_alter_query)
node1: BaseNode = self.db_cluster.nodes[0]
node1.run_cqlsh(cmd=full_alter_query)
InfoEvent(message=f"Altered table by: {full_alter_query}").publish()
def _set_enforce_min_threshold_true(self):
yaml_file = "/etc/scylla/scylla.yaml"
tmp_yaml_file = "/tmp/scylla.yaml"
set_enforce_min_threshold = dedent("""
grep -v compaction_enforce_min_threshold {0} > {1}
echo compaction_enforce_min_threshold: true >> {1}
cp -f {1} {0}
""".format(yaml_file, tmp_yaml_file))
for node in self.db_cluster.nodes: # set compaction_enforce_min_threshold on all nodes
node.remoter.run('sudo bash -cxe "%s"' % set_enforce_min_threshold)
self.log.debug("Scylla YAML configuration read from: {} {} is:".format(node.public_ip_address, yaml_file))
node.remoter.run('sudo cat {}'.format(yaml_file))
node.stop_scylla_server()
node.start_scylla_server()
def test_ics_space_amplification_goal(self): # pylint: disable=too-many-locals
"""
(1) writing new data. wait for compactions to finish.
(2) over-writing existing data.
(3) measure space amplification after over-writing with SAG=None,1.5,1.2,None
"""
self._set_enforce_min_threshold_true()
# (1) writing new data.
prepare_write_cmd = self.params.get('prepare_write_cmd')
InfoEvent(message=f"Starting C-S prepare load: {prepare_write_cmd}").publish()
self.run_prepare_write_cmd()
InfoEvent(message="Wait for compactions to finish after write is done.").publish()
self.wait_no_compactions_running()
stress_cmd = self.params.get('stress_cmd')
sag_testing_values = [None, '1.5', '1.2', '1.5', None]
column_size = 205
num_of_columns = 5
# the below number is 1TB (yaml stress cmd total write) in bytes / 205 (column_size) / 5 (num_of_columns)
overwrite_ops_num = 1072694271
total_data_to_overwrite_gb = round(overwrite_ops_num * column_size * num_of_columns / (1024 ** 3), 2)
min_threshold = '4'
# (2) over-writing existing data.
for sag in sag_testing_values:
dict_nodes_capacity_before_overwrite_data = self._get_nodes_used_capacity()
InfoEvent(
message=f"Nodes used capacity before start overwriting data:"
f" {dict_nodes_capacity_before_overwrite_data}").publish()
additional_compaction_params = {'min_threshold': min_threshold}
if sag:
additional_compaction_params.update({'space_amplification_goal': sag})
# (3) Altering compaction with SAG=None,1.5,1.2,1.5,None
self._alter_table_compaction(additional_compaction_params=additional_compaction_params)
stress_queue = []
InfoEvent(message=f"Starting C-S over-write load: {stress_cmd}").publish()
start_time = time.time()
params = {'keyspace_num': 1, 'stress_cmd': stress_cmd,
'round_robin': self.params.get('round_robin')}
self._run_all_stress_cmds(stress_queue, params)
for stress in stress_queue:
self.verify_stress_thread(cs_thread_pool=stress)
InfoEvent(message="Wait for compactions to finish after over-write is done.").publish()
self.wait_no_compactions_running()
# (3) measure space amplification for the re-written data
self.measure_nodes_space_amplification_after_write(
dict_nodes_initial_capacity=dict_nodes_capacity_before_overwrite_data,
written_data_size_gb=total_data_to_overwrite_gb, start_time=start_time)
InfoEvent(message="Space-amplification-goal testing cycles are done.").publish()