shishkovilja commented on code in PR #12531:
URL: https://github.com/apache/ignite/pull/12531#discussion_r2598660627


##########
modules/core/src/main/java/org/apache/ignite/internal/IgniteDiagnosticRequest.java:
##########
@@ -0,0 +1,180 @@
+/*
+ * 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;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.LinkedHashMap;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+import org.apache.ignite.internal.managers.communication.GridIoMessageFactory;
+import org.apache.ignite.internal.util.typedef.internal.S;
+import org.apache.ignite.plugin.extensions.communication.Message;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ *
+ */
+public class IgniteDiagnosticRequest implements Message {
+    /** */
+    @Order(value = 0, method = "futureId")
+    private long futId;
+
+    /** Originator node id. */
+    @Order(1)
+    private UUID nodeId;
+
+    /** Infos to send to a remote node. */
+    @Order(2)
+    private @Nullable LinkedHashSet<DiagnosticBaseInfo> infos;
+
+    /** Local message related to remote info. */
+    private final Map<Object, List<String>> msgs = new LinkedHashMap<>();
+
+    /**
+     * Default constructor required by {@link GridIoMessageFactory}.
+     */
+    public IgniteDiagnosticRequest() {
+        // No-op.
+    }
+
+    /**
+     * Creates a diagnostic info holder.
+     *
+     * @param nodeId Originator node ID.
+     */
+    IgniteDiagnosticRequest(UUID nodeId) {
+        this.nodeId = nodeId;
+    }
+
+    /**
+     * Creates a diagnostic request.
+     *
+     * @param futId Future ID.
+     * @param nodeId Node ID.
+     * @param infos Diagnostic infos.
+     */
+    public IgniteDiagnosticRequest(long futId, UUID nodeId, @Nullable 
LinkedHashSet<DiagnosticBaseInfo> infos) {

Review Comment:
   ```suggestion
       public IgniteDiagnosticRequest(long futId, UUID nodeId, @Nullable 
Collection<DiagnosticBaseInfo> infos) {
   ```



##########
modules/core/src/main/java/org/apache/ignite/internal/IgniteDiagnosticRequest.java:
##########
@@ -0,0 +1,180 @@
+/*
+ * 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;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.LinkedHashMap;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+import org.apache.ignite.internal.managers.communication.GridIoMessageFactory;
+import org.apache.ignite.internal.util.typedef.internal.S;
+import org.apache.ignite.plugin.extensions.communication.Message;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ *
+ */
+public class IgniteDiagnosticRequest implements Message {
+    /** */
+    @Order(value = 0, method = "futureId")
+    private long futId;
+
+    /** Originator node id. */
+    @Order(1)
+    private UUID nodeId;
+
+    /** Infos to send to a remote node. */
+    @Order(2)
+    private @Nullable LinkedHashSet<DiagnosticBaseInfo> infos;
+
+    /** Local message related to remote info. */
+    private final Map<Object, List<String>> msgs = new LinkedHashMap<>();
+
+    /**
+     * Default constructor required by {@link GridIoMessageFactory}.
+     */
+    public IgniteDiagnosticRequest() {
+        // No-op.
+    }
+
+    /**
+     * Creates a diagnostic info holder.
+     *
+     * @param nodeId Originator node ID.
+     */
+    IgniteDiagnosticRequest(UUID nodeId) {
+        this.nodeId = nodeId;
+    }
+
+    /**
+     * Creates a diagnostic request.
+     *
+     * @param futId Future ID.
+     * @param nodeId Node ID.
+     * @param infos Diagnostic infos.
+     */
+    public IgniteDiagnosticRequest(long futId, UUID nodeId, @Nullable 
LinkedHashSet<DiagnosticBaseInfo> infos) {
+        this(nodeId);
+
+        this.futId = futId;
+        this.infos = infos;

Review Comment:
   ```suggestion
           this.infos = toLinkedHashSet(infos);
   ```
   
   (see some details in the below comments)



##########
modules/core/src/test/java/org/apache/ignite/internal/managers/IgniteDiagnosticMessagesTest.java:
##########
@@ -222,7 +222,7 @@ private CacheConfiguration 
cacheConfiguration(CacheAtomicityMode atomicityMode)
      * @throws Exception If failed.
      */
     @Test
-    public void testSeveralLongRunningTxs() throws Exception {
+        public void testSeveralLongRunningTxs() throws Exception {

Review Comment:
   Redundant modification.



##########
modules/core/src/main/java/org/apache/ignite/internal/processors/cluster/ClusterProcessor.java:
##########
@@ -914,12 +872,15 @@ public IgniteInternalFuture<String> 
requestDiagnosticInfo(final UUID nodeId, Com
 
     /**
      * @param nodeId Target node ID.
-     * @param info Compound info.
+     * @param infos Diagnostic infos to send.
      * @return Message future.
      */
-    private IgniteInternalFuture<IgniteDiagnosticInfo> 
sendDiagnosticMessage(UUID nodeId, CompoundInfo info) {
+    private IgniteInternalFuture<String> sendDiagnosticMessage(
+        UUID nodeId,
+        @Nullable LinkedHashSet<IgniteDiagnosticRequest.DiagnosticBaseInfo> 
infos

Review Comment:
   ```suggestion
           @Nullable Collection<IgniteDiagnosticRequest.DiagnosticBaseInfo> 
infos
   ```



##########
modules/core/src/main/java/org/apache/ignite/internal/IgniteDiagnosticResponse.java:
##########
@@ -0,0 +1,84 @@
+/*
+ * 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;
+
+import org.apache.ignite.internal.managers.communication.GridIoMessageFactory;
+import org.apache.ignite.internal.util.typedef.internal.S;
+import org.apache.ignite.plugin.extensions.communication.Message;
+import org.jetbrains.annotations.Nullable;
+
+/** */
+public class IgniteDiagnosticResponse implements Message {
+    /** */
+    @Order(value = 0, method = "futureId")
+    private long futId;
+
+    /** */
+    @Order(value = 1, method = "responseInfo")
+    private @Nullable String respInfo;
+
+    /**
+     * Default constructor required by {@link GridIoMessageFactory}.
+     */
+    public IgniteDiagnosticResponse() {
+        // No-op.
+    }
+
+    /**
+     * Creates a diagnostic response.
+     *
+     * @param futId Future ID.
+     * @param resp Diagnostic info result.
+     */
+    public IgniteDiagnosticResponse(long futId, String resp) {

Review Comment:
   ```suggestion
       public IgniteDiagnosticResponse(long futId, @Nullable String resp) {
   ```



##########
modules/core/src/main/java/org/apache/ignite/internal/TxEntriesInfo.java:
##########
@@ -0,0 +1,139 @@
+/*
+ * 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;
+
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.Objects;
+import org.apache.ignite.IgniteCheckedException;
+import org.apache.ignite.internal.managers.communication.GridIoMessageFactory;
+import org.apache.ignite.internal.processors.cache.GridCacheContext;
+import org.apache.ignite.internal.processors.cache.GridCacheMapEntry;
+import org.apache.ignite.internal.processors.cache.KeyCacheObject;
+import org.apache.ignite.internal.util.typedef.internal.U;
+
+/** */
+public final class TxEntriesInfo extends 
IgniteDiagnosticRequest.DiagnosticBaseInfo {
+    /** */
+    @Order(0)
+    private int cacheId;
+
+    /** */
+    @Order(1)
+    private Collection<KeyCacheObject> keys;
+
+    /**
+     * Empty constructor required by {@link GridIoMessageFactory}.
+     */
+    public TxEntriesInfo() {
+        // No-op.
+    }
+
+    /**
+     * @param cacheId Cache ID.
+     * @param keys    Keys.
+     */
+    TxEntriesInfo(int cacheId, Collection<KeyCacheObject> keys) {
+        this.cacheId = cacheId;
+        this.keys = new HashSet<>(keys);
+    }
+
+    /** */
+    public int cacheId() {
+        return cacheId;
+    }
+
+    /** */
+    public void cacheId(int cacheId) {
+        this.cacheId = cacheId;
+    }
+
+    /** */
+    public Collection<KeyCacheObject> keys() {
+        return keys;
+    }
+
+    /** */
+    public void keys(Collection<KeyCacheObject> keys) {
+        this.keys = keys;
+    }
+
+    /** {@inheritDoc} */
+    @Override public short directType() {
+        return -64;
+    }
+
+    /** {@inheritDoc} */
+    @Override public void appendInfo(StringBuilder sb, GridKernalContext ctx) {
+        sb.append(U.nl());
+
+        GridCacheContext<?, ?> cctx = 
ctx.cache().context().cacheContext(cacheId);
+
+        if (cctx == null) {
+            sb.append("Failed to find cache with id: ").append(cacheId);
+
+            return;
+        }
+
+        try {
+            for (KeyCacheObject key : keys)
+                key.finishUnmarshal(cctx.cacheObjectContext(), null);
+        }
+        catch (IgniteCheckedException e) {
+            ctx.cluster().diagnosticLog().error("Failed to unmarshal key: " + 
e, e);
+
+            sb.append("Failed to unmarshal key: ").append(e).append(U.nl());
+        }
+
+        sb.append("Cache entries [cacheId=").append(cacheId)
+            .append(", cacheName=").append(cctx.name()).append("]: ");
+
+        for (KeyCacheObject key : keys) {
+            GridCacheMapEntry e = (GridCacheMapEntry)cctx.cache().peekEx(key);
+
+            sb.append(U.nl()).append("    Key [key=").append(key).append(", 
entry=").append(e).append("]");
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override public void merge(IgniteDiagnosticRequest.DiagnosticBaseInfo 
other) {
+        TxEntriesInfo other0 = (TxEntriesInfo)other;
+
+        assert other0 != null && cacheId == other0.cacheId : other;
+
+        this.keys.addAll(other0.keys);

Review Comment:
   ```suggestion
           keys.addAll(other0.keys);
   ```



##########
modules/core/src/main/java/org/apache/ignite/internal/IgniteDiagnosticRequest.java:
##########
@@ -0,0 +1,180 @@
+/*
+ * 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;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.LinkedHashMap;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+import org.apache.ignite.internal.managers.communication.GridIoMessageFactory;
+import org.apache.ignite.internal.util.typedef.internal.S;
+import org.apache.ignite.plugin.extensions.communication.Message;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ *
+ */
+public class IgniteDiagnosticRequest implements Message {
+    /** */
+    @Order(value = 0, method = "futureId")
+    private long futId;
+
+    /** Originator node id. */
+    @Order(1)
+    private UUID nodeId;
+
+    /** Infos to send to a remote node. */
+    @Order(2)
+    private @Nullable LinkedHashSet<DiagnosticBaseInfo> infos;
+
+    /** Local message related to remote info. */
+    private final Map<Object, List<String>> msgs = new LinkedHashMap<>();
+
+    /**
+     * Default constructor required by {@link GridIoMessageFactory}.
+     */
+    public IgniteDiagnosticRequest() {
+        // No-op.
+    }
+
+    /**
+     * Creates a diagnostic info holder.
+     *
+     * @param nodeId Originator node ID.
+     */
+    IgniteDiagnosticRequest(UUID nodeId) {
+        this.nodeId = nodeId;
+    }
+
+    /**
+     * Creates a diagnostic request.
+     *
+     * @param futId Future ID.
+     * @param nodeId Node ID.
+     * @param infos Diagnostic infos.
+     */
+    public IgniteDiagnosticRequest(long futId, UUID nodeId, @Nullable 
LinkedHashSet<DiagnosticBaseInfo> infos) {
+        this(nodeId);
+
+        this.futId = futId;
+        this.infos = infos;
+    }
+
+    /**
+     * @return Initial message.
+     */
+    public String message() {
+        StringBuilder sb = new StringBuilder();
+
+        for (List<String> msgs0 : msgs.values()) {
+            for (String msg : msgs0) {
+                if (sb.length() > 0)
+                    sb.append('\n');
+
+                sb.append(msg);
+            }
+        }
+
+        return sb.toString();
+    }
+
+    /**
+     * @param msg Message.
+     * @param baseInfo Info or {@code null} if only basic info is needed.
+     */
+    void add(String msg, @Nullable IgniteDiagnosticRequest.DiagnosticBaseInfo 
baseInfo) {
+        Object key = baseInfo != null ? baseInfo : getClass();
+
+        msgs.computeIfAbsent(key, k -> new ArrayList<>()).add(msg);
+
+        if (baseInfo != null) {
+            if (infos == null)
+                infos = new LinkedHashSet<>();
+
+            if (!infos.add(baseInfo) && baseInfo instanceof TxEntriesInfo) {
+                for (IgniteDiagnosticRequest.DiagnosticBaseInfo baseInfo0 : 
infos) {
+                    if (baseInfo0.equals(baseInfo))
+                        baseInfo0.merge(baseInfo);
+                }
+            }
+        }
+    }
+
+    /** */
+    public UUID nodeId() {
+        return nodeId;
+    }
+
+    /** */
+    public void nodeId(UUID nodeId) {
+        this.nodeId = nodeId;
+    }
+
+    /**
+     * @return Future ID.
+     */
+    public long futureId() {
+        return futId;
+    }
+
+    /** */
+    public void futureId(long futId) {
+        this.futId = futId;
+    }
+
+    /** @return Compound diagnostic infos.  */
+    public @Nullable LinkedHashSet<DiagnosticBaseInfo> infos() {

Review Comment:
   ```suggestion
       public @Nullable Collection<DiagnosticBaseInfo> infos() {
   ```



##########
modules/core/src/main/java/org/apache/ignite/internal/IgniteDiagnosticResponse.java:
##########
@@ -0,0 +1,84 @@
+/*
+ * 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;
+
+import org.apache.ignite.internal.managers.communication.GridIoMessageFactory;
+import org.apache.ignite.internal.util.typedef.internal.S;
+import org.apache.ignite.plugin.extensions.communication.Message;
+import org.jetbrains.annotations.Nullable;
+
+/** */
+public class IgniteDiagnosticResponse implements Message {
+    /** */
+    @Order(value = 0, method = "futureId")
+    private long futId;
+
+    /** */
+    @Order(value = 1, method = "responseInfo")
+    private @Nullable String respInfo;
+
+    /**
+     * Default constructor required by {@link GridIoMessageFactory}.
+     */
+    public IgniteDiagnosticResponse() {
+        // No-op.
+    }
+
+    /**
+     * Creates a diagnostic response.
+     *
+     * @param futId Future ID.
+     * @param resp Diagnostic info result.
+     */
+    public IgniteDiagnosticResponse(long futId, String resp) {
+        this.futId = futId;
+        respInfo = resp;
+    }
+
+    /**
+     * @return Future ID.
+     */
+    public long futureId() {
+        return futId;
+    }
+
+    /** */
+    public void futureId(long futId) {
+        this.futId = futId;
+    }
+
+    /** */
+    public @Nullable String responseInfo() {
+        return respInfo;
+    }
+
+    /** */
+    public void responseInfo(@Nullable String infoResp) {
+        this.respInfo = infoResp;

Review Comment:
   ```suggestion
           this.respInfo = respInfo;
   ```



##########
modules/core/src/main/java/org/apache/ignite/internal/IgniteDiagnosticRequest.java:
##########
@@ -0,0 +1,180 @@
+/*
+ * 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;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.LinkedHashMap;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+import org.apache.ignite.internal.managers.communication.GridIoMessageFactory;
+import org.apache.ignite.internal.util.typedef.internal.S;
+import org.apache.ignite.plugin.extensions.communication.Message;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ *
+ */
+public class IgniteDiagnosticRequest implements Message {
+    /** */
+    @Order(value = 0, method = "futureId")
+    private long futId;
+
+    /** Originator node id. */
+    @Order(1)
+    private UUID nodeId;
+
+    /** Infos to send to a remote node. */
+    @Order(2)
+    private @Nullable LinkedHashSet<DiagnosticBaseInfo> infos;
+
+    /** Local message related to remote info. */
+    private final Map<Object, List<String>> msgs = new LinkedHashMap<>();
+
+    /**
+     * Default constructor required by {@link GridIoMessageFactory}.
+     */
+    public IgniteDiagnosticRequest() {
+        // No-op.
+    }
+
+    /**
+     * Creates a diagnostic info holder.
+     *
+     * @param nodeId Originator node ID.
+     */
+    IgniteDiagnosticRequest(UUID nodeId) {
+        this.nodeId = nodeId;
+    }
+
+    /**
+     * Creates a diagnostic request.
+     *
+     * @param futId Future ID.
+     * @param nodeId Node ID.
+     * @param infos Diagnostic infos.
+     */
+    public IgniteDiagnosticRequest(long futId, UUID nodeId, @Nullable 
LinkedHashSet<DiagnosticBaseInfo> infos) {
+        this(nodeId);
+
+        this.futId = futId;
+        this.infos = infos;
+    }
+
+    /**
+     * @return Initial message.
+     */
+    public String message() {
+        StringBuilder sb = new StringBuilder();
+
+        for (List<String> msgs0 : msgs.values()) {
+            for (String msg : msgs0) {
+                if (sb.length() > 0)
+                    sb.append('\n');
+
+                sb.append(msg);
+            }
+        }
+
+        return sb.toString();
+    }
+
+    /**
+     * @param msg Message.
+     * @param baseInfo Info or {@code null} if only basic info is needed.
+     */
+    void add(String msg, @Nullable IgniteDiagnosticRequest.DiagnosticBaseInfo 
baseInfo) {
+        Object key = baseInfo != null ? baseInfo : getClass();
+
+        msgs.computeIfAbsent(key, k -> new ArrayList<>()).add(msg);
+
+        if (baseInfo != null) {
+            if (infos == null)
+                infos = new LinkedHashSet<>();
+
+            if (!infos.add(baseInfo) && baseInfo instanceof TxEntriesInfo) {
+                for (IgniteDiagnosticRequest.DiagnosticBaseInfo baseInfo0 : 
infos) {
+                    if (baseInfo0.equals(baseInfo))
+                        baseInfo0.merge(baseInfo);
+                }
+            }
+        }
+    }
+
+    /** */
+    public UUID nodeId() {
+        return nodeId;
+    }
+
+    /** */
+    public void nodeId(UUID nodeId) {
+        this.nodeId = nodeId;
+    }
+
+    /**
+     * @return Future ID.
+     */
+    public long futureId() {
+        return futId;
+    }
+
+    /** */
+    public void futureId(long futId) {
+        this.futId = futId;
+    }
+
+    /** @return Compound diagnostic infos.  */
+    public @Nullable LinkedHashSet<DiagnosticBaseInfo> infos() {
+        return infos;
+    }
+
+    /** */
+    public void infos(@Nullable Collection<DiagnosticBaseInfo> infos) {

Review Comment:
   Lets create separate method for such cast, eg.:
   ```
       public void infos(@Nullable Collection<DiagnosticBaseInfo> infos) {
           // Deserialization supports only `Collection` interface in 
MessageReader#readCollection.
           this.infos = toLinkedHashSet(infos);
       }
   
       /** */
       private static @Nullable LinkedHashSet<DiagnosticBaseInfo> 
toLinkedHashSet(@Nullable Collection<DiagnosticBaseInfo> infos) {
           return infos == null
               ? null
               : infos instanceof LinkedHashSet ? 
(LinkedHashSet<DiagnosticBaseInfo>)infos : new LinkedHashSet<>(infos);
       }
   ```



##########
modules/core/src/main/java/org/apache/ignite/internal/IgniteDiagnosticResponse.java:
##########
@@ -0,0 +1,84 @@
+/*
+ * 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;
+
+import org.apache.ignite.internal.managers.communication.GridIoMessageFactory;
+import org.apache.ignite.internal.util.typedef.internal.S;
+import org.apache.ignite.plugin.extensions.communication.Message;
+import org.jetbrains.annotations.Nullable;
+
+/** */
+public class IgniteDiagnosticResponse implements Message {
+    /** */
+    @Order(value = 0, method = "futureId")
+    private long futId;
+
+    /** */
+    @Order(value = 1, method = "responseInfo")
+    private @Nullable String respInfo;
+
+    /**
+     * Default constructor required by {@link GridIoMessageFactory}.
+     */
+    public IgniteDiagnosticResponse() {
+        // No-op.
+    }
+
+    /**
+     * Creates a diagnostic response.
+     *
+     * @param futId Future ID.
+     * @param resp Diagnostic info result.
+     */
+    public IgniteDiagnosticResponse(long futId, String resp) {
+        this.futId = futId;
+        respInfo = resp;
+    }
+
+    /**
+     * @return Future ID.
+     */
+    public long futureId() {
+        return futId;
+    }
+
+    /** */
+    public void futureId(long futId) {
+        this.futId = futId;
+    }
+
+    /** */
+    public @Nullable String responseInfo() {
+        return respInfo;
+    }
+
+    /** */
+    public void responseInfo(@Nullable String infoResp) {

Review Comment:
   ```suggestion
       public void responseInfo(@Nullable String respInfo) {
   ```



##########
modules/core/src/main/java/org/apache/ignite/internal/IgniteDiagnosticRequest.java:
##########
@@ -0,0 +1,180 @@
+/*
+ * 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;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.LinkedHashMap;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+import org.apache.ignite.internal.managers.communication.GridIoMessageFactory;
+import org.apache.ignite.internal.util.typedef.internal.S;
+import org.apache.ignite.plugin.extensions.communication.Message;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ *
+ */
+public class IgniteDiagnosticRequest implements Message {
+    /** */
+    @Order(value = 0, method = "futureId")
+    private long futId;
+
+    /** Originator node id. */
+    @Order(1)
+    private UUID nodeId;
+
+    /** Infos to send to a remote node. */
+    @Order(2)
+    private @Nullable LinkedHashSet<DiagnosticBaseInfo> infos;
+
+    /** Local message related to remote info. */
+    private final Map<Object, List<String>> msgs = new LinkedHashMap<>();
+
+    /**
+     * Default constructor required by {@link GridIoMessageFactory}.
+     */
+    public IgniteDiagnosticRequest() {
+        // No-op.
+    }
+
+    /**
+     * Creates a diagnostic info holder.
+     *
+     * @param nodeId Originator node ID.
+     */
+    IgniteDiagnosticRequest(UUID nodeId) {
+        this.nodeId = nodeId;
+    }
+
+    /**
+     * Creates a diagnostic request.
+     *
+     * @param futId Future ID.
+     * @param nodeId Node ID.
+     * @param infos Diagnostic infos.
+     */
+    public IgniteDiagnosticRequest(long futId, UUID nodeId, @Nullable 
LinkedHashSet<DiagnosticBaseInfo> infos) {
+        this(nodeId);
+
+        this.futId = futId;
+        this.infos = infos;
+    }
+
+    /**
+     * @return Initial message.
+     */
+    public String message() {
+        StringBuilder sb = new StringBuilder();
+
+        for (List<String> msgs0 : msgs.values()) {
+            for (String msg : msgs0) {
+                if (sb.length() > 0)
+                    sb.append('\n');
+
+                sb.append(msg);
+            }
+        }
+
+        return sb.toString();
+    }
+
+    /**
+     * @param msg Message.
+     * @param baseInfo Info or {@code null} if only basic info is needed.
+     */
+    void add(String msg, @Nullable IgniteDiagnosticRequest.DiagnosticBaseInfo 
baseInfo) {
+        Object key = baseInfo != null ? baseInfo : getClass();
+
+        msgs.computeIfAbsent(key, k -> new ArrayList<>()).add(msg);
+
+        if (baseInfo != null) {
+            if (infos == null)
+                infos = new LinkedHashSet<>();
+
+            if (!infos.add(baseInfo) && baseInfo instanceof TxEntriesInfo) {
+                for (IgniteDiagnosticRequest.DiagnosticBaseInfo baseInfo0 : 
infos) {
+                    if (baseInfo0.equals(baseInfo))
+                        baseInfo0.merge(baseInfo);
+                }
+            }
+        }
+    }
+
+    /** */
+    public UUID nodeId() {
+        return nodeId;
+    }
+
+    /** */
+    public void nodeId(UUID nodeId) {
+        this.nodeId = nodeId;
+    }
+
+    /**
+     * @return Future ID.
+     */
+    public long futureId() {
+        return futId;
+    }
+
+    /** */
+    public void futureId(long futId) {
+        this.futId = futId;
+    }
+
+    /** @return Compound diagnostic infos.  */
+    public @Nullable LinkedHashSet<DiagnosticBaseInfo> infos() {
+        return infos;
+    }
+
+    /** */

Review Comment:
   ```suggestion
       /** Sets compound diagnostic infos. */
   ```



##########
modules/core/src/main/java/org/apache/ignite/internal/IgniteDiagnosticRequest.java:
##########
@@ -0,0 +1,180 @@
+/*
+ * 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;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.LinkedHashMap;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+import org.apache.ignite.internal.managers.communication.GridIoMessageFactory;
+import org.apache.ignite.internal.util.typedef.internal.S;
+import org.apache.ignite.plugin.extensions.communication.Message;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ *
+ */
+public class IgniteDiagnosticRequest implements Message {
+    /** */
+    @Order(value = 0, method = "futureId")
+    private long futId;
+
+    /** Originator node id. */
+    @Order(1)
+    private UUID nodeId;
+
+    /** Infos to send to a remote node. */
+    @Order(2)
+    private @Nullable LinkedHashSet<DiagnosticBaseInfo> infos;
+
+    /** Local message related to remote info. */
+    private final Map<Object, List<String>> msgs = new LinkedHashMap<>();
+
+    /**
+     * Default constructor required by {@link GridIoMessageFactory}.
+     */
+    public IgniteDiagnosticRequest() {
+        // No-op.
+    }
+
+    /**
+     * Creates a diagnostic info holder.
+     *
+     * @param nodeId Originator node ID.
+     */
+    IgniteDiagnosticRequest(UUID nodeId) {
+        this.nodeId = nodeId;
+    }
+
+    /**
+     * Creates a diagnostic request.
+     *
+     * @param futId Future ID.
+     * @param nodeId Node ID.
+     * @param infos Diagnostic infos.
+     */
+    public IgniteDiagnosticRequest(long futId, UUID nodeId, @Nullable 
LinkedHashSet<DiagnosticBaseInfo> infos) {
+        this(nodeId);
+
+        this.futId = futId;
+        this.infos = infos;
+    }
+
+    /**
+     * @return Initial message.
+     */
+    public String message() {
+        StringBuilder sb = new StringBuilder();
+
+        for (List<String> msgs0 : msgs.values()) {
+            for (String msg : msgs0) {
+                if (sb.length() > 0)
+                    sb.append('\n');
+
+                sb.append(msg);
+            }
+        }
+
+        return sb.toString();
+    }
+
+    /**
+     * @param msg Message.
+     * @param baseInfo Info or {@code null} if only basic info is needed.
+     */
+    void add(String msg, @Nullable IgniteDiagnosticRequest.DiagnosticBaseInfo 
baseInfo) {
+        Object key = baseInfo != null ? baseInfo : getClass();
+
+        msgs.computeIfAbsent(key, k -> new ArrayList<>()).add(msg);
+
+        if (baseInfo != null) {
+            if (infos == null)
+                infos = new LinkedHashSet<>();
+
+            if (!infos.add(baseInfo) && baseInfo instanceof TxEntriesInfo) {
+                for (IgniteDiagnosticRequest.DiagnosticBaseInfo baseInfo0 : 
infos) {
+                    if (baseInfo0.equals(baseInfo))
+                        baseInfo0.merge(baseInfo);
+                }
+            }
+        }
+    }
+
+    /** */
+    public UUID nodeId() {
+        return nodeId;
+    }
+
+    /** */
+    public void nodeId(UUID nodeId) {
+        this.nodeId = nodeId;
+    }
+
+    /**
+     * @return Future ID.
+     */
+    public long futureId() {
+        return futId;
+    }
+
+    /** */
+    public void futureId(long futId) {
+        this.futId = futId;
+    }
+
+    /** @return Compound diagnostic infos.  */

Review Comment:
   ```suggestion
       /** @return Compound diagnostic infos. */
   ```



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