Vladsz83 commented on code in PR #13577:
URL: https://github.com/apache/ignite/pull/13577#discussion_r4137230761


##########
modules/core/src/test/java/org/apache/ignite/internal/processors/cache/persistence/snapshot/IgniteClusterSnapshotDeleteTest.java:
##########
@@ -0,0 +1,1019 @@
+/*
+ * 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.
+ */
+
+package org.apache.ignite.internal.processors.cache.persistence.snapshot;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.RandomAccessFile;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.attribute.PosixFilePermission;
+import java.nio.file.attribute.PosixFilePermissions;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Random;
+import java.util.Set;
+import java.util.UUID;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicReference;
+import java.util.function.Supplier;
+import org.apache.ignite.Ignite;
+import org.apache.ignite.IgniteException;
+import org.apache.ignite.IgniteIllegalStateException;
+import org.apache.ignite.configuration.DataStorageConfiguration;
+import org.apache.ignite.configuration.IgniteConfiguration;
+import org.apache.ignite.internal.IgniteEx;
+import org.apache.ignite.internal.TestRecordingCommunicationSpi;
+import org.apache.ignite.internal.processors.cache.persistence.file.FileIO;
+import 
org.apache.ignite.internal.processors.cache.persistence.file.RandomAccessFileIOFactory;
+import 
org.apache.ignite.internal.processors.cache.persistence.filename.SnapshotFileTree;
+import org.apache.ignite.internal.util.distributed.DistributedProcess;
+import org.apache.ignite.internal.util.distributed.SingleNodeMessage;
+import org.apache.ignite.internal.util.future.IgniteFutureImpl;
+import org.apache.ignite.internal.util.typedef.F;
+import org.apache.ignite.internal.util.typedef.G;
+import org.apache.ignite.internal.util.typedef.T2;
+import org.apache.ignite.internal.util.typedef.internal.U;
+import org.apache.ignite.lang.IgniteFuture;
+import org.apache.ignite.plugin.AbstractTestPluginProvider;
+import org.apache.ignite.plugin.PluginContext;
+import org.jetbrains.annotations.Nullable;
+import org.junit.Test;
+import org.junit.runners.Parameterized;
+import org.junit.runners.Parameterized.Parameter;
+
+import static 
org.apache.ignite.internal.util.distributed.DistributedProcess.DistributedProcessType.CHECK_SNAPSHOT_METAS;
+import static 
org.apache.ignite.internal.util.distributed.DistributedProcess.DistributedProcessType.CHECK_SNAPSHOT_PARTS;
+import static 
org.apache.ignite.internal.util.distributed.DistributedProcess.DistributedProcessType.DELETE_SNAPSHOT;
+import static 
org.apache.ignite.internal.util.distributed.DistributedProcess.DistributedProcessType.END_SNAPSHOT;
+import static 
org.apache.ignite.internal.util.distributed.DistributedProcess.DistributedProcessType.RESTORE_CACHE_GROUP_SNAPSHOT_PRELOAD;
+import static 
org.apache.ignite.internal.util.distributed.DistributedProcess.DistributedProcessType.RESTORE_CACHE_GROUP_SNAPSHOT_PREPARE;
+import static 
org.apache.ignite.internal.util.distributed.DistributedProcess.DistributedProcessType.RESTORE_CACHE_GROUP_SNAPSHOT_ROLLBACK;
+import static 
org.apache.ignite.internal.util.distributed.DistributedProcess.DistributedProcessType.RESTORE_CACHE_GROUP_SNAPSHOT_START;
+import static 
org.apache.ignite.internal.util.distributed.DistributedProcess.DistributedProcessType.RESTORE_INCREMENTAL_SNAPSHOT_START;
+import static 
org.apache.ignite.internal.util.distributed.DistributedProcess.DistributedProcessType.START_SNAPSHOT;
+import static 
org.apache.ignite.testframework.GridTestUtils.assertThrowsAnyCause;
+import static org.junit.Assume.assumeFalse;
+import static org.junit.Assume.assumeTrue;
+
+/** */
+public class IgniteClusterSnapshotDeleteTest extends AbstractSnapshotSelfTest {
+    /** */
+    private static final int INC_CACHE_KEYS_RANGE = CACHE_KEYS_RANGE + 
CACHE_KEYS_RANGE / 4;
+
+    /** Extra storage path. */
+    private static final String EXT_STORAGE_PATH = "extStorage";
+
+    /** */
+    private static boolean CASE_INSENSETIVE_FS;
+
+    /** */
+    private static boolean POSIX_PERMISSIONS;
+
+    /** */
+    private boolean separatedWorkDir;
+
+    /** */
+    private boolean extraStorages;
+
+    /** */
+    @Parameter(2)
+    public boolean incremental = true;
+
+    /** */
+    private @Nullable String cstIdSuffix;
+
+    /** Sets the extra snapshot storage to {@link 
DataStorageConfiguration#setExtraSnapshotPaths(String...)}. */
+    private boolean lowerCasedSnpName;
+
+    /** */
+    private @Nullable String[] extStoragePaths;
+
+    /** Parameters. */
+    @Parameterized.Parameters(name = "encryption={0}, onlyPrimary={1}, 
incremental={2}")
+    public static Collection<?> runParams() {
+        /** Use {@link #incremental} only. */
+        return F.asList(
+            new Object[] {false, false, false},
+            new Object[] {false, false, true}
+        );
+    }
+
+    /** {@inheritDoc} */
+    @Override protected IgniteConfiguration getConfiguration(String 
igniteInstanceName) throws Exception {
+        var cfg = super.getConfiguration(igniteInstanceName);
+
+        String workDir = separatedWorkDir
+            ? new File(U.defaultWorkDirectory(), 
igniteInstanceName).getAbsolutePath()
+            : U.defaultWorkDirectory();
+
+        cfg.setWorkDirectory(workDir);
+
+        if (cstIdSuffix != null)
+            cfg.setConsistentId(cfg.getConsistentId().toString() + '_' + 
cstIdSuffix);
+
+        if (extraStorages) {
+            cfg.getDataStorageConfiguration().setExtraStoragePaths(
+                workDir + File.separator,
+                workDir + File.separator + EXT_STORAGE_PATH
+            );
+
+            extStoragePaths = 
cfg.getDataStorageConfiguration().getExtraStoragePaths();
+
+            cfg.getDataStorageConfiguration().setExtraSnapshotPaths("", 
EXT_STORAGE_PATH);

Review Comment:
   > I found that snapshot creation duplicates data in such a case, i mean : 
Also i found a strange structure for such a case :
   > 
   > ```
   > /ignite/work/snapshots/testSnapshot/db
   > /ignite/work/extStorage/snapshots/testSnapshot/db
   > ```
   > 
   > is it a bug ? probably some data duplication ? If i`am right - seems an 
issue need here, wdyt ?
   
   Not sure about this case. But I think that in general yes. Something is 
wrong about path forming of external storages. I also saw issues like creating 
snapshot in wierd subfolders or creating 3 snapshot copies instead of 2. I took 
the external storages params so that the places of the additional storages look 
reasonable: one in dte default `work/snapshots`, second on 
`addidionalWork/snapshots`. But this ticket doesn't touch creating of result 
paths of extra storages. It just uses them.



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