ivandasch commented on a change in pull request #8267:
URL: https://github.com/apache/ignite/pull/8267#discussion_r494127689



##########
File path: modules/ducktests/tests/ignitetest/tests/snapshot_test.py
##########
@@ -0,0 +1,162 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""
+Module contains discovery tests.
+"""
+
+import time
+import re
+
+from ducktape.mark.resource import cluster
+
+from ignitetest.services.ignite import IgniteService
+from ignitetest.services.ignite_app import IgniteApplicationService
+from ignitetest.services.utils.control_utility import ControlUtility
+from ignitetest.services.utils.ignite_configuration import 
IgniteConfiguration, DataStorageConfiguration
+from ignitetest.services.utils.ignite_configuration.data_storage import 
DataRegionConfiguration
+from ignitetest.utils import ignite_versions
+from ignitetest.utils.ignite_test import IgniteTest
+from ignitetest.utils.version import DEV_BRANCH, IgniteVersion
+
+
+# pylint: disable=W0223
+class SnapshotTest(IgniteTest):
+    """
+    Test Snapshot.
+    """
+    NUM_NODES = 4
+
+    SNAPSHOT_NAME = "test_snap"
+
+    @cluster(num_nodes=NUM_NODES)
+    @ignite_versions(str(DEV_BRANCH))
+    def snapshot_test(self, ignite_version):
+        """
+        Test Snapshot.
+        1. Start of ignite cluster.
+        2. Activate cluster.
+        3. Load.
+        4. Idle verify dump1.
+        5. Snapshot.
+        6. Load.
+        7. Idle verify dump2.
+        8. Сhecking that dump1 and dump2 are differentю
+        9. Stop ignite and replace db from snapshot
+        10. Run ignite cluster.
+        11. Idle verify dump3.
+        12. Checking the equality of dump1 and dump3.
+        """
+        data_cfg = 
DataStorageConfiguration(default=DataRegionConfiguration(persistent=True))
+
+        ignite_config = IgniteConfiguration(
+            version=IgniteVersion(ignite_version),
+            data_storage=data_cfg,
+        )
+
+        service = IgniteService(self.test_context, ignite_config, 
num_nodes=self.NUM_NODES - 1)
+        service.start()
+
+        control_utility = ControlUtility(service, self.test_context)
+        control_utility.activate()
+
+        client_config = ignite_config._replace(client_mode=True, 
data_storage=None)
+
+        streamer = IgniteApplicationService(
+            self.test_context,
+            client_config,
+            
java_class_name="org.apache.ignite.internal.ducktest.tests.UuidStreamerApplication",
+            params={"cacheName": "test-cache"})
+
+        load(streamer)
+
+        node = service.nodes[0]
+
+        check_idle_verify(control_utility)
+        check_validate_indexes(control_utility)
+        dump_1 = get_dump_path(control_utility, node)
+
+        self.logger.warn("Path to dump_1=" + dump_1)
+
+        data = control_utility.snapshot_create(self.SNAPSHOT_NAME)
+
+        self.logger.warn(data)
+
+        load(streamer)
+
+        dump_2 = get_dump_path(control_utility, node)
+
+        self.logger.warn("Path to dump_2=" + dump_2)
+
+        diff = node.account.ssh_output(f'diff {dump_1} {dump_2}', 
allow_fail=True)
+        assert len(diff) != 0, diff
+
+        service.rename_db(new_db_name='old_db')
+        service.copy_snap_to_db(self.SNAPSHOT_NAME)
+
+        service.run()
+
+        control_utility.activate()
+
+        check_idle_verify(control_utility)
+        check_validate_indexes(control_utility)
+        dump_3 = get_dump_path(control_utility, node)
+
+        self.logger.warn("Path to dump_3=" + dump_2)
+
+        diff = node.account.ssh_output(f'diff {dump_1} {dump_3}', 
allow_fail=True)
+        assert len(diff) == 0, diff

Review comment:
       No, this is because snapshot is restored

##########
File path: modules/ducktests/tests/ignitetest/utils/ignite_test.py
##########
@@ -40,3 +44,45 @@ def monotonic():
             so that only the difference between the results of consecutive 
calls is valid.
         """
         return monotonic()
+
+    def copy_ignite_root_dir(self):
+        """
+        Copying root directory from service nodes to the results directory.
+        """
+        for service in self.test_context.services:
+            if not isinstance(service, IgniteService):
+                self.logger.debug("Won't collect service workdir from %s." % 
service.service_id)
+                continue
+
+            if service.config.data_storage and 
service.config.data_storage.default.persistent:
+                # Try to copy the root directory
+                self.logger.debug("Copying persistence dir...")
+                try:
+                    for node in service.nodes:
+                        dest = os.path.join(
+                            TestContext.results_dir(self.test_context, 
self.test_context.test_index),
+                            service.service_id, node.account.hostname)
+                        self.logger.debug("Dest dir " + dest)
+                        if not os.path.isdir(dest):
+                            mkdir_p(dest)
+
+                        tgz_root = '%s.tgz' % PersistenceAware.PERSISTENT_ROOT
+
+                        
node.account.ssh(compress_cmd(PersistenceAware.PERSISTENT_ROOT, tgz_root))
+                        node.account.copy_from(tgz_root, dest)
+                except Exception as ex:

Review comment:
       Please, inline warning W0703 and remove it from class comment.
   
   

##########
File path: modules/ducktests/tests/ignitetest/services/ignite.py
##########
@@ -46,13 +46,40 @@ def __init__(self, context, config, num_nodes, 
jvm_opts=None, modules=None):
 
     # pylint: disable=W0221
     def start(self, timeout_sec=180):
+        self._rotate_log()
+
         super().start()
 
         self.logger.info("Waiting for Ignite(s) to start...")
 
         for node in self.nodes:
             self.await_node_started(node, timeout_sec)
 
+    def run(self, timeout_sec=180):

Review comment:
       Unfortunatelly, ducktape allows start node only with cleaning. We should 
add smth like restart and comment that this should be rewrittten after 
appropriate change in ducktape codebase will be merged.




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