WIP: Add regression test on config reload

dbms/tests/integration/test_reload_max_table_size_to_drop/configs/config.xml

@@ -0,0 +1,31 @@
+<?xml version="1.0"?>
+<yandex>
+    <logger>
+        <level>trace</level>
+        <log>/var/log/clickhouse-server/clickhouse-server.log</log>
+        <errorlog>/var/log/clickhouse-server/clickhouse-server.err.log</errorlog>
+        <size>1000M</size>
+        <count>10</count>
+    </logger>
+
+    <tcp_port>9000</tcp_port>
+    <listen_host>127.0.0.1</listen_host>
+
+    <openSSL>
+        <client>
+            <cacheSessions>true</cacheSessions>
+            <verificationMode>none</verificationMode>
+            <invalidCertificateHandler>
+                <name>AcceptCertificateHandler</name>
+            </invalidCertificateHandler>
+        </client>
+    </openSSL>
+
+    <max_concurrent_queries>500</max_concurrent_queries>
+    <mark_cache_size>5368709120</mark_cache_size>
+    <path>./clickhouse/</path>
+    <users_config>users.xml</users_config>
+
+    <max_table_size_to_drop>1</max_table_size_to_drop>
+    <max_partition_size_to_drop>1</max_partition_size_to_drop>
+</yandex>

dbms/tests/integration/test_reload_max_table_size_to_drop/configs/users.xml

@@ -0,0 +1,23 @@
+<?xml version="1.0"?>
+<yandex>
+    <profiles>
+        <default>
+        </default>
+    </profiles>
+
+    <users>
+        <default>
+            <password></password>
+            <networks incl="networks" replace="replace">
+                <ip>::/0</ip>
+            </networks>
+            <profile>default</profile>
+            <quota>default</quota>
+        </default>
+    </users>
+
+    <quotas>
+        <default>
+        </default>
+    </quotas>
+</yandex>

dbms/tests/integration/test_reload_max_table_size_to_drop/test.py

@@ -0,0 +1,55 @@
+import time
+import pytest
+import sys
+import os
+
+from helpers.cluster import ClickHouseCluster
+
+
+cluster = ClickHouseCluster(__file__)
+node = cluster.add_instance('node', config_dir="configs")
+
+SCRIPT_DIR = os.path.dirname(os.path.realpath(__file__))
+config_dir = os.path.join(SCRIPT_DIR, './_instances/node/configs')
+
+
+@pytest.fixture(scope="module")
+def start_cluster():
+    try:
+        cluster.start()
+        node.query("CREATE DATABASE chtest;")
+        node.query(
+            '''
+            CREATE TABLE chtest.reload_max_table_size (date Date, id UInt32) 
+            ENGINE = MergeTree(date, id, 8192)
+            '''
+        )
+        node.query("INSERT INTO chtest.reload_max_table_size VALUES (now(), 0)")
+        yield cluster
+    finally:
+        #cluster.shutdown()
+        pass
+
+
+def test_reload_max_table_size_to_drop(start_cluster):
+    config = open(config_dir + '/config.xml', 'r')
+    config_lines = config.readlines()
+    config.close()
+
+    error = node.get_query_request("DROP TABLE chtest.reload_max_table_size") # change to query_and_get_error after fix
+    print >> sys.stderr, 'error: ' + error.get_answer()
+    print >> sys.stderr, 'path: ' + config_dir
+    print >> sys.stderr, 'config: '
+    for line in config_lines:
+        print >> sys.stderr, line
+
+    assert error != "" # Crashes due to illigal config
+
+    config_lines = map(lambda line: line.replace("<max_table_size_to_drop>1", "<max_table_size_to_drop>1000000"),
+                       config_lines)
+    config = open(config_dir + '/config.xml', 'w')
+    config.writelines(config_lines)
+
+    time.sleep(50000)
+    error = node.query_and_get_error("DROP TABLE chtest.reload_max_table_size")
+    assert error == ""