Vladsz83 commented on code in PR #11391:
URL: https://github.com/apache/ignite/pull/11391#discussion_r1673799644


##########
modules/core/src/main/java/org/apache/ignite/internal/processors/cache/persistence/snapshot/SnapshotFullCheckDistributedProcess.java:
##########
@@ -0,0 +1,549 @@
+/*
+ * 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.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.UUID;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.ThreadLocalRandom;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+import org.apache.ignite.IgniteCheckedException;
+import org.apache.ignite.IgniteException;
+import org.apache.ignite.IgniteLogger;
+import org.apache.ignite.cluster.ClusterNode;
+import org.apache.ignite.events.DiscoveryEvent;
+import org.apache.ignite.internal.GridKernalContext;
+import org.apache.ignite.internal.IgniteInternalFuture;
+import org.apache.ignite.internal.cluster.ClusterTopologyCheckedException;
+import org.apache.ignite.internal.management.cache.IdleVerifyResultV2;
+import org.apache.ignite.internal.management.cache.PartitionKeyV2;
+import 
org.apache.ignite.internal.management.cache.VerifyBackupPartitionsTaskV2;
+import 
org.apache.ignite.internal.processors.cache.verify.PartitionHashRecordV2;
+import org.apache.ignite.internal.util.distributed.DistributedProcess;
+import org.apache.ignite.internal.util.future.GridFinishedFuture;
+import org.apache.ignite.internal.util.future.GridFutureAdapter;
+import org.apache.ignite.internal.util.typedef.F;
+import org.apache.ignite.internal.util.typedef.internal.CU;
+import org.jetbrains.annotations.Nullable;
+
+import static org.apache.ignite.events.EventType.EVT_NODE_FAILED;
+import static org.apache.ignite.events.EventType.EVT_NODE_LEFT;
+import static 
org.apache.ignite.internal.util.distributed.DistributedProcess.DistributedProcessType.SNAPSHOT_CHECK_METAS;
+import static 
org.apache.ignite.internal.util.distributed.DistributedProcess.DistributedProcessType.SNAPSHOT_VALIDATE_PARTS;
+
+/** Distributed process of snapshot full checking (with the partition hashes). 
*/
+public class SnapshotFullCheckDistributedProcess {
+    /** */
+    private static final IgniteInternalFuture FINISHED_FUT = new 
GridFinishedFuture<>();
+
+    /** */
+    private final IgniteLogger log;
+
+    /** */
+    private final GridKernalContext kctx;
+
+    /** Snapshot check requests per snapshot on every node. */
+    final Map<String, SnapshotFullCheckOperationRequest> requests = new 
ConcurrentHashMap<>();
+
+    /** Cluster-wide operation futures per snapshot called from current node. 
*/
+    private final Map<UUID, 
GridFutureAdapter<SnapshotPartitionsVerifyTaskResult>> clusterOpFuts = new 
ConcurrentHashMap<>();
+
+    /** Check metas first phase subprocess. */
+    private final DistributedProcess<SnapshotFullCheckOperationRequest, 
ArrayList<SnapshotMetadata>> phase1CheckMetas;
+
+    /** Partition hashes second phase subprocess.  */
+    private final DistributedProcess<SnapshotFullCheckOperationRequest, 
HashMap<PartitionKeyV2, PartitionHashRecordV2>> phase2PartsHashes;
+
+    /** */
+    public SnapshotFullCheckDistributedProcess(GridKernalContext kctx) {
+        this.kctx = kctx;
+
+        log = kctx.log(getClass());
+
+        phase1CheckMetas = new DistributedProcess<>(kctx, 
SNAPSHOT_CHECK_METAS, this::prepareAndCheckMetas,
+            this::reducePreparationAndMetasCheck);
+
+        phase2PartsHashes = new DistributedProcess<>(kctx, 
SNAPSHOT_VALIDATE_PARTS, this::validateParts,
+            this::reduceValidatePartsAndFinish);
+
+        kctx.event().addLocalEventListener((evt) -> 
nodeLeft(((DiscoveryEvent)evt).eventNode()), EVT_NODE_FAILED, EVT_NODE_LEFT);

Review Comment:
   Yes. But I wanted to make the code more independent. The process is able to 
handle most of the events itself. WDYT?



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