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https://github.com/ClickHouse/ClickHouse.git
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74 lines
3.2 KiB
Python
74 lines
3.2 KiB
Python
#!/usr/bin/env python3
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import pytest
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import time
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from helpers.cluster import ClickHouseCluster
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from helpers.network import PartitionManager
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import random
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import string
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cluster = ClickHouseCluster(__file__)
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node1 = cluster.add_instance('node1', with_zookeeper=True)
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node2 = cluster.add_instance('node2', with_zookeeper=True)
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DEFAULT_MAX_THREADS_FOR_FETCH = 3
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@pytest.fixture(scope="module")
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def started_cluster():
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try:
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cluster.start()
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yield cluster
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finally:
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cluster.shutdown()
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def get_random_string(length):
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return ''.join(random.choice(string.ascii_uppercase + string.digits) for _ in range(length))
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def test_limited_fetches(started_cluster):
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"""
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Test checks that that we utilize all available threads for fetches
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"""
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node1.query("CREATE TABLE t (key UInt64, data String) ENGINE = ReplicatedMergeTree('/clickhouse/test/t', '1') ORDER BY tuple() PARTITION BY key")
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node2.query("CREATE TABLE t (key UInt64, data String) ENGINE = ReplicatedMergeTree('/clickhouse/test/t', '2') ORDER BY tuple() PARTITION BY key")
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with PartitionManager() as pm:
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node2.query("SYSTEM STOP FETCHES t")
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node1.query("INSERT INTO t SELECT 1, '{}' FROM numbers(5000)".format(get_random_string(104857)))
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node1.query("INSERT INTO t SELECT 2, '{}' FROM numbers(5000)".format(get_random_string(104857)))
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node1.query("INSERT INTO t SELECT 3, '{}' FROM numbers(5000)".format(get_random_string(104857)))
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node1.query("INSERT INTO t SELECT 4, '{}' FROM numbers(5000)".format(get_random_string(104857)))
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node1.query("INSERT INTO t SELECT 5, '{}' FROM numbers(5000)".format(get_random_string(104857)))
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node1.query("INSERT INTO t SELECT 6, '{}' FROM numbers(5000)".format(get_random_string(104857)))
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pm.add_network_delay(node1, 80)
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node2.query("SYSTEM START FETCHES t")
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fetches_result = []
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background_fetches_metric = []
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fetched_parts = set([])
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for _ in range(1000):
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result = node2.query("SELECT result_part_name FROM system.replicated_fetches").strip().split()
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background_fetches_metric.append(int(node2.query("select value from system.metrics where metric = 'BackgroundFetchesPoolTask'").strip()))
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if not result:
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if len(fetched_parts) == 6:
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break
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time.sleep(0.1)
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else:
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for part in result:
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fetched_parts.add(part)
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fetches_result.append(result)
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print(fetches_result[-1])
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print(background_fetches_metric[-1])
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time.sleep(0.1)
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for concurrently_fetching_parts in fetches_result:
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if len(concurrently_fetching_parts) > DEFAULT_MAX_THREADS_FOR_FETCH:
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assert False, "Found more than {} concurrently fetching parts: {}".format(DEFAULT_MAX_THREADS_FOR_FETCH, ', '.join(concurrently_fetching_parts))
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assert max([len(parts) for parts in fetches_result]) == 3, "Strange, but we don't utilize max concurrent threads for fetches"
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assert(max(background_fetches_metric)) == 3, "Just checking metric consistent with table"
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node1.query("DROP TABLE IF EXISTS t SYNC")
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node2.query("DROP TABLE IF EXISTS t SYNC") |