timoninmaxim commented on code in PR #12301:
URL: https://github.com/apache/ignite/pull/12301#discussion_r2469816239


##########
modules/core/src/main/java/org/apache/ignite/internal/processors/rollingupgrade/RollingUpgradeProcessor.java:
##########
@@ -0,0 +1,310 @@
+/*
+ * 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.rollingupgrade;
+
+import java.util.HashSet;
+import java.util.Objects;
+import java.util.Set;
+import org.apache.ignite.IgniteCheckedException;
+import org.apache.ignite.IgniteException;
+import org.apache.ignite.cluster.ClusterNode;
+import org.apache.ignite.internal.GridKernalContext;
+import org.apache.ignite.internal.processors.GridProcessorAdapter;
+import 
org.apache.ignite.internal.processors.metastorage.DistributedMetaStorage;
+import 
org.apache.ignite.internal.processors.metastorage.DistributedMetastorageLifecycleListener;
+import 
org.apache.ignite.internal.processors.metastorage.ReadableDistributedMetaStorage;
+import 
org.apache.ignite.internal.processors.nodevalidation.DiscoveryNodeValidationProcessor;
+import org.apache.ignite.internal.util.lang.IgnitePair;
+import org.apache.ignite.internal.util.typedef.F;
+import org.apache.ignite.internal.util.typedef.internal.LT;
+import org.apache.ignite.internal.util.typedef.internal.U;
+import org.apache.ignite.lang.IgniteProductVersion;
+import org.apache.ignite.spi.IgniteNodeValidationResult;
+import org.apache.ignite.spi.discovery.tcp.TcpDiscoverySpi;
+import org.apache.ignite.spi.discovery.tcp.internal.TcpDiscoveryNodesRing;
+import org.jetbrains.annotations.Nullable;
+
+import static org.apache.ignite.internal.IgniteNodeAttributes.ATTR_BUILD_VER;
+import static 
org.apache.ignite.internal.processors.metastorage.DistributedMetaStorage.IGNITE_INTERNAL_KEY_PREFIX;
+
+/** Rolling upgrade processor. Manages current and target versions of cluster. 
*/
+public class RollingUpgradeProcessor extends GridProcessorAdapter implements 
DiscoveryNodeValidationProcessor {
+    /** Key for the distributed property that holds current and target 
versions. */
+    private static final String ROLLING_UPGRADE_VERSIONS_KEY = 
IGNITE_INTERNAL_KEY_PREFIX + "rolling.upgrade.versions";
+
+    /** Metastorage with the write access. */
+    @Nullable private volatile DistributedMetaStorage metastorage;
+
+    /** TCP discovery nodes ring. */
+    private TcpDiscoveryNodesRing ring;
+
+    /** Last joining node. */
+    private ClusterNode lastJoiningNode;
+
+    /** Last joining node timestamp. */
+    private long lastJoiningNodeTimestamp;
+
+    /** Lock for synchronization between tcp-disco-msg-worker thread and 
management operations. */
+    private final Object lock = new Object();
+
+    /** Pair with current and target versions. */

Review Comment:
   @Nullable. {@code null} when rolling upgrade is disabled.



##########
modules/core/src/main/java/org/apache/ignite/internal/GridKernalContextImpl.java:
##########
@@ -362,6 +363,10 @@ public class GridKernalContextImpl implements 
GridKernalContext, Externalizable
     @GridToStringExclude
     private PerformanceStatisticsProcessor perfStatProc;
 
+    /** Rolling upgrade processor. */
+    @GridToStringExclude
+    private RollingUpgradeProcessor rolUpProc;

Review Comment:
   rollUpProc



##########
modules/core/src/main/java/org/apache/ignite/internal/processors/rollingupgrade/RollingUpgradeProcessor.java:
##########
@@ -0,0 +1,310 @@
+/*
+ * 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.rollingupgrade;
+
+import java.util.HashSet;
+import java.util.Objects;
+import java.util.Set;
+import org.apache.ignite.IgniteCheckedException;
+import org.apache.ignite.IgniteException;
+import org.apache.ignite.cluster.ClusterNode;
+import org.apache.ignite.internal.GridKernalContext;
+import org.apache.ignite.internal.processors.GridProcessorAdapter;
+import 
org.apache.ignite.internal.processors.metastorage.DistributedMetaStorage;
+import 
org.apache.ignite.internal.processors.metastorage.DistributedMetastorageLifecycleListener;
+import 
org.apache.ignite.internal.processors.metastorage.ReadableDistributedMetaStorage;
+import 
org.apache.ignite.internal.processors.nodevalidation.DiscoveryNodeValidationProcessor;
+import org.apache.ignite.internal.util.lang.IgnitePair;
+import org.apache.ignite.internal.util.typedef.F;
+import org.apache.ignite.internal.util.typedef.internal.LT;
+import org.apache.ignite.internal.util.typedef.internal.U;
+import org.apache.ignite.lang.IgniteProductVersion;
+import org.apache.ignite.spi.IgniteNodeValidationResult;
+import org.apache.ignite.spi.discovery.tcp.TcpDiscoverySpi;
+import org.apache.ignite.spi.discovery.tcp.internal.TcpDiscoveryNodesRing;
+import org.jetbrains.annotations.Nullable;
+
+import static org.apache.ignite.internal.IgniteNodeAttributes.ATTR_BUILD_VER;
+import static 
org.apache.ignite.internal.processors.metastorage.DistributedMetaStorage.IGNITE_INTERNAL_KEY_PREFIX;
+
+/** Rolling upgrade processor. Manages current and target versions of cluster. 
*/
+public class RollingUpgradeProcessor extends GridProcessorAdapter implements 
DiscoveryNodeValidationProcessor {
+    /** Key for the distributed property that holds current and target 
versions. */
+    private static final String ROLLING_UPGRADE_VERSIONS_KEY = 
IGNITE_INTERNAL_KEY_PREFIX + "rolling.upgrade.versions";
+
+    /** Metastorage with the write access. */
+    @Nullable private volatile DistributedMetaStorage metastorage;
+
+    /** TCP discovery nodes ring. */
+    private TcpDiscoveryNodesRing ring;
+
+    /** Last joining node. */
+    private ClusterNode lastJoiningNode;
+
+    /** Last joining node timestamp. */
+    private long lastJoiningNodeTimestamp;
+
+    /** Lock for synchronization between tcp-disco-msg-worker thread and 
management operations. */
+    private final Object lock = new Object();
+
+    /** Pair with current and target versions. */
+    private volatile IgnitePair<IgniteProductVersion> verPair = null;
+
+    /**
+     * @param ctx Context.
+     */
+    public RollingUpgradeProcessor(GridKernalContext ctx) {
+        super(ctx);
+    }
+
+    /** {@inheritDoc} */
+    @Override public void start() throws IgniteCheckedException {
+        
ctx.internalSubscriptionProcessor().registerDistributedMetastorageListener(new 
DistributedMetastorageLifecycleListener() {
+            @Override public void onReadyForWrite(DistributedMetaStorage 
metastorage) {
+                RollingUpgradeProcessor.this.metastorage = metastorage;
+            }
+
+            @Override public void 
onReadyForRead(ReadableDistributedMetaStorage metastorage) {
+                try {
+                    verPair = metastorage.read(ROLLING_UPGRADE_VERSIONS_KEY);
+                }
+                catch (IgniteCheckedException e) {
+                    throw new IgniteException(e);
+                }
+
+                // Keep the current and target version pair in sync with 
metastorage updates, e.g., to handle coordinator changes.
+                metastorage.listen(ROLLING_UPGRADE_VERSIONS_KEY::equals, (key, 
oldVal, newVal) -> {
+                    verPair = (IgnitePair<IgniteProductVersion>)newVal;
+                });
+            }
+        });
+    }
+
+    /** {@inheritDoc} The joining node is stored to verify later whether it 
successfully connected to the ring or failed to join. */
+    @Override public @Nullable IgniteNodeValidationResult 
validateNode(ClusterNode node) {
+        synchronized (lock) {
+            lastJoiningNode = node;
+
+            lastJoiningNodeTimestamp = U.currentTimeMillis();
+        }
+
+        ClusterNode locNode = ctx.discovery().localNode();
+
+        String locBuildVer = locNode.attribute(ATTR_BUILD_VER);
+        String rmtBuildVer = node.attribute(ATTR_BUILD_VER);
+
+        IgniteProductVersion rmtVer = 
IgniteProductVersion.fromString(rmtBuildVer);
+
+        IgnitePair<IgniteProductVersion> pair = verPair;
+
+        if (pair == null)
+            pair = F.pair(IgniteProductVersion.fromString(locBuildVer), null);
+
+        IgniteProductVersion curVer = pair.get1();
+        IgniteProductVersion targetVer = pair.get2();
+
+        if (Objects.equals(rmtVer, curVer) || Objects.equals(rmtVer, 
targetVer))
+            return null;
+
+        String errMsg = "Remote node rejected due to incompatible version for 
cluster join.\n"
+            + "Remote node info:\n"
+            + "  - Version     : " + rmtBuildVer + "\n"
+            + "  - Addresses   : " + U.addressesAsString(node) + "\n"
+            + "  - Node ID     : " + node.id() + "\n"
+            + "Local node info:\n"
+            + "  - Version     : " + locBuildVer + "\n"
+            + "  - Addresses   : " + U.addressesAsString(locNode) + "\n"
+            + "  - Node ID     : " + locNode.id() + "\n"
+            + "Allowed versions for joining: " + curVer + (targetVer == null ? 
"" : ", " + targetVer);
+
+        LT.warn(log, errMsg);
+
+        if (log.isDebugEnabled())
+            log.debug(errMsg);
+
+        return new IgniteNodeValidationResult(node.id(), errMsg);
+    }
+
+    /**
+     * Enables rolling upgrade with specified target version.
+     * This method can only be called on coordinator node with {@link 
TcpDiscoverySpi}.
+     *
+     * @param target Target version.
+     * @throws IgniteCheckedException If:
+     *     <ul>
+     *         <li>The current and target versions are incompatible;</li>
+     *         <li>The local node is not a coordinator;</li>
+     *         <li>The discovery SPI is not {@link TcpDiscoverySpi};</li>
+     *         <li>The distributed metastorage is not ready;</li>
+     *         <li>{@link TcpDiscoveryNodesRing} was not provided.</li>
+     *     </ul>
+     */
+    public void enable(IgniteProductVersion target) throws 
IgniteCheckedException {
+        if (ring == null)
+            throw new IgniteCheckedException("TCP discovery nodes ring was not 
provided.");
+
+        if (!U.isLocalNodeCoordinator(ctx.discovery()))
+            throw new IgniteCheckedException("Rolling upgrade can be enabled 
only on coordinator node");
+
+        if (metastorage == null)
+            throw new IgniteCheckedException("Meta storage is not ready.");
+
+        if (!(ctx.config().getDiscoverySpi() instanceof TcpDiscoverySpi))
+            throw new IgniteCheckedException("Rolling upgrade is supported 
only with TCP discovery SPI");
+
+        String curBuildVer = 
ctx.discovery().localNode().attribute(ATTR_BUILD_VER);
+        IgniteProductVersion curVer = 
IgniteProductVersion.fromString(curBuildVer);
+
+        if (!checkVersionsForEnabling(curVer, target))
+            return;
+
+        IgnitePair<IgniteProductVersion> newPair = F.pair(curVer, target);
+
+        if (!metastorage.compareAndSet(ROLLING_UPGRADE_VERSIONS_KEY, null, 
newPair)) {
+            IgnitePair<IgniteProductVersion> oldVerPair = 
metastorage.read(ROLLING_UPGRADE_VERSIONS_KEY);
+
+            if (newPair.equals(oldVerPair))
+                return;
+
+            if (oldVerPair == null)
+                throw new IgniteCheckedException("Could not enable rolling 
upgrade. Try again.");
+
+            throw new IgniteCheckedException("Rolling upgrade is already 
enabled with a different current and target version: " +
+                oldVerPair.get1() + " , " + oldVerPair.get2());
+        }
+
+        verPair = newPair;
+
+        if (log.isInfoEnabled())
+            log.info("Rolling upgrade enabled [current=" + curVer + ", 
target=" + target + ']');
+    }
+
+    /**
+     * Disables rolling upgrade.
+     * This method can only be called on coordinator node.
+     *
+     * @throws IgniteCheckedException If cluster has two or more nodes with 
different versions or if node is not coordinator
+     * or metastorage is not ready.
+     */
+    public void disable() throws IgniteCheckedException {
+        if (!U.isLocalNodeCoordinator(ctx.discovery()))
+            throw new IgniteCheckedException("Rolling upgrade can be disabled 
only on coordinator node");
+
+        if (metastorage == null)
+            throw new IgniteCheckedException("Meta storage is not ready.");
+
+        if (verPair == null)
+            return;
+
+        IgnitePair<IgniteProductVersion> minMaxVerPair = 
ring.minMaxNodeVersions();
+
+        Set<IgniteProductVersion> vers = new HashSet<>();
+
+        vers.add(minMaxVerPair.get1());
+
+        vers.add(minMaxVerPair.get2());
+
+        if (vers.size() > 1)
+            throw new IgniteCheckedException("Can't disable rolling upgrade 
with different versions in cluster: " + vers);
+
+        synchronized (lock) {
+            if (lastJoiningNode != null) {
+                long timeout = 
((TcpDiscoverySpi)ctx.config().getDiscoverySpi()).getJoinTimeout();

Review Comment:
   let's use more than single timeout, at least 3.
   
   Also should handle special case with timeout = 0. 



##########
modules/core/src/main/java/org/apache/ignite/internal/processors/rollingupgrade/RollingUpgradeProcessor.java:
##########
@@ -0,0 +1,310 @@
+/*
+ * 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.rollingupgrade;
+
+import java.util.HashSet;
+import java.util.Objects;
+import java.util.Set;
+import org.apache.ignite.IgniteCheckedException;
+import org.apache.ignite.IgniteException;
+import org.apache.ignite.cluster.ClusterNode;
+import org.apache.ignite.internal.GridKernalContext;
+import org.apache.ignite.internal.processors.GridProcessorAdapter;
+import 
org.apache.ignite.internal.processors.metastorage.DistributedMetaStorage;
+import 
org.apache.ignite.internal.processors.metastorage.DistributedMetastorageLifecycleListener;
+import 
org.apache.ignite.internal.processors.metastorage.ReadableDistributedMetaStorage;
+import 
org.apache.ignite.internal.processors.nodevalidation.DiscoveryNodeValidationProcessor;
+import org.apache.ignite.internal.util.lang.IgnitePair;
+import org.apache.ignite.internal.util.typedef.F;
+import org.apache.ignite.internal.util.typedef.internal.LT;
+import org.apache.ignite.internal.util.typedef.internal.U;
+import org.apache.ignite.lang.IgniteProductVersion;
+import org.apache.ignite.spi.IgniteNodeValidationResult;
+import org.apache.ignite.spi.discovery.tcp.TcpDiscoverySpi;
+import org.apache.ignite.spi.discovery.tcp.internal.TcpDiscoveryNodesRing;
+import org.jetbrains.annotations.Nullable;
+
+import static org.apache.ignite.internal.IgniteNodeAttributes.ATTR_BUILD_VER;
+import static 
org.apache.ignite.internal.processors.metastorage.DistributedMetaStorage.IGNITE_INTERNAL_KEY_PREFIX;
+
+/** Rolling upgrade processor. Manages current and target versions of cluster. 
*/
+public class RollingUpgradeProcessor extends GridProcessorAdapter implements 
DiscoveryNodeValidationProcessor {
+    /** Key for the distributed property that holds current and target 
versions. */
+    private static final String ROLLING_UPGRADE_VERSIONS_KEY = 
IGNITE_INTERNAL_KEY_PREFIX + "rolling.upgrade.versions";
+
+    /** Metastorage with the write access. */
+    @Nullable private volatile DistributedMetaStorage metastorage;
+
+    /** TCP discovery nodes ring. */
+    private TcpDiscoveryNodesRing ring;
+
+    /** Last joining node. */
+    private ClusterNode lastJoiningNode;
+
+    /** Last joining node timestamp. */
+    private long lastJoiningNodeTimestamp;
+
+    /** Lock for synchronization between tcp-disco-msg-worker thread and 
management operations. */
+    private final Object lock = new Object();
+
+    /** Pair with current and target versions. */
+    private volatile IgnitePair<IgniteProductVersion> verPair = null;
+
+    /**
+     * @param ctx Context.
+     */
+    public RollingUpgradeProcessor(GridKernalContext ctx) {
+        super(ctx);
+    }
+
+    /** {@inheritDoc} */
+    @Override public void start() throws IgniteCheckedException {
+        
ctx.internalSubscriptionProcessor().registerDistributedMetastorageListener(new 
DistributedMetastorageLifecycleListener() {
+            @Override public void onReadyForWrite(DistributedMetaStorage 
metastorage) {
+                RollingUpgradeProcessor.this.metastorage = metastorage;
+            }
+
+            @Override public void 
onReadyForRead(ReadableDistributedMetaStorage metastorage) {
+                try {
+                    verPair = metastorage.read(ROLLING_UPGRADE_VERSIONS_KEY);
+                }
+                catch (IgniteCheckedException e) {
+                    throw new IgniteException(e);
+                }
+
+                // Keep the current and target version pair in sync with 
metastorage updates, e.g., to handle coordinator changes.
+                metastorage.listen(ROLLING_UPGRADE_VERSIONS_KEY::equals, (key, 
oldVal, newVal) -> {
+                    verPair = (IgnitePair<IgniteProductVersion>)newVal;
+                });
+            }
+        });
+    }
+
+    /** {@inheritDoc} The joining node is stored to verify later whether it 
successfully connected to the ring or failed to join. */
+    @Override public @Nullable IgniteNodeValidationResult 
validateNode(ClusterNode node) {
+        synchronized (lock) {
+            lastJoiningNode = node;
+
+            lastJoiningNodeTimestamp = U.currentTimeMillis();
+        }
+
+        ClusterNode locNode = ctx.discovery().localNode();
+
+        String locBuildVer = locNode.attribute(ATTR_BUILD_VER);
+        String rmtBuildVer = node.attribute(ATTR_BUILD_VER);
+
+        IgniteProductVersion rmtVer = 
IgniteProductVersion.fromString(rmtBuildVer);
+
+        IgnitePair<IgniteProductVersion> pair = verPair;
+
+        if (pair == null)
+            pair = F.pair(IgniteProductVersion.fromString(locBuildVer), null);
+
+        IgniteProductVersion curVer = pair.get1();
+        IgniteProductVersion targetVer = pair.get2();
+
+        if (Objects.equals(rmtVer, curVer) || Objects.equals(rmtVer, 
targetVer))
+            return null;
+
+        String errMsg = "Remote node rejected due to incompatible version for 
cluster join.\n"
+            + "Remote node info:\n"
+            + "  - Version     : " + rmtBuildVer + "\n"
+            + "  - Addresses   : " + U.addressesAsString(node) + "\n"
+            + "  - Node ID     : " + node.id() + "\n"
+            + "Local node info:\n"
+            + "  - Version     : " + locBuildVer + "\n"
+            + "  - Addresses   : " + U.addressesAsString(locNode) + "\n"
+            + "  - Node ID     : " + locNode.id() + "\n"
+            + "Allowed versions for joining: " + curVer + (targetVer == null ? 
"" : ", " + targetVer);
+
+        LT.warn(log, errMsg);
+
+        if (log.isDebugEnabled())
+            log.debug(errMsg);
+
+        return new IgniteNodeValidationResult(node.id(), errMsg);
+    }
+
+    /**
+     * Enables rolling upgrade with specified target version.
+     * This method can only be called on coordinator node with {@link 
TcpDiscoverySpi}.
+     *
+     * @param target Target version.
+     * @throws IgniteCheckedException If:
+     *     <ul>
+     *         <li>The current and target versions are incompatible;</li>
+     *         <li>The local node is not a coordinator;</li>
+     *         <li>The discovery SPI is not {@link TcpDiscoverySpi};</li>
+     *         <li>The distributed metastorage is not ready;</li>
+     *         <li>{@link TcpDiscoveryNodesRing} was not provided.</li>
+     *     </ul>
+     */
+    public void enable(IgniteProductVersion target) throws 
IgniteCheckedException {
+        if (ring == null)
+            throw new IgniteCheckedException("TCP discovery nodes ring was not 
provided.");

Review Comment:
   What admin should do with this message? And for "Meta storage is not ready"? 
   
   Let's write a suggestion for an admin.



##########
modules/core/src/main/java/org/apache/ignite/internal/processors/rollingupgrade/RollingUpgradeProcessor.java:
##########
@@ -0,0 +1,310 @@
+/*
+ * 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.rollingupgrade;
+
+import java.util.HashSet;
+import java.util.Objects;
+import java.util.Set;
+import org.apache.ignite.IgniteCheckedException;
+import org.apache.ignite.IgniteException;
+import org.apache.ignite.cluster.ClusterNode;
+import org.apache.ignite.internal.GridKernalContext;
+import org.apache.ignite.internal.processors.GridProcessorAdapter;
+import 
org.apache.ignite.internal.processors.metastorage.DistributedMetaStorage;
+import 
org.apache.ignite.internal.processors.metastorage.DistributedMetastorageLifecycleListener;
+import 
org.apache.ignite.internal.processors.metastorage.ReadableDistributedMetaStorage;
+import 
org.apache.ignite.internal.processors.nodevalidation.DiscoveryNodeValidationProcessor;
+import org.apache.ignite.internal.util.lang.IgnitePair;
+import org.apache.ignite.internal.util.typedef.F;
+import org.apache.ignite.internal.util.typedef.internal.LT;
+import org.apache.ignite.internal.util.typedef.internal.U;
+import org.apache.ignite.lang.IgniteProductVersion;
+import org.apache.ignite.spi.IgniteNodeValidationResult;
+import org.apache.ignite.spi.discovery.tcp.TcpDiscoverySpi;
+import org.apache.ignite.spi.discovery.tcp.internal.TcpDiscoveryNodesRing;
+import org.jetbrains.annotations.Nullable;
+
+import static org.apache.ignite.internal.IgniteNodeAttributes.ATTR_BUILD_VER;
+import static 
org.apache.ignite.internal.processors.metastorage.DistributedMetaStorage.IGNITE_INTERNAL_KEY_PREFIX;
+
+/** Rolling upgrade processor. Manages current and target versions of cluster. 
*/
+public class RollingUpgradeProcessor extends GridProcessorAdapter implements 
DiscoveryNodeValidationProcessor {
+    /** Key for the distributed property that holds current and target 
versions. */
+    private static final String ROLLING_UPGRADE_VERSIONS_KEY = 
IGNITE_INTERNAL_KEY_PREFIX + "rolling.upgrade.versions";
+
+    /** Metastorage with the write access. */
+    @Nullable private volatile DistributedMetaStorage metastorage;
+
+    /** TCP discovery nodes ring. */
+    private TcpDiscoveryNodesRing ring;
+
+    /** Last joining node. */
+    private ClusterNode lastJoiningNode;
+
+    /** Last joining node timestamp. */
+    private long lastJoiningNodeTimestamp;
+
+    /** Lock for synchronization between tcp-disco-msg-worker thread and 
management operations. */
+    private final Object lock = new Object();
+
+    /** Pair with current and target versions. */
+    private volatile IgnitePair<IgniteProductVersion> verPair = null;

Review Comment:
   Not need to initialize with null



##########
modules/core/src/test/java/org/apache/ignite/internal/GridReleaseTypeSelfTest.java:
##########
@@ -17,23 +17,56 @@
 
 package org.apache.ignite.internal;
 
-import java.io.PrintWriter;
-import java.io.StringWriter;
+import java.util.Collection;
+import java.util.List;
 import java.util.Map;
+import java.util.function.UnaryOperator;
 import org.apache.ignite.IgniteCheckedException;
+import org.apache.ignite.IgniteException;
+import org.apache.ignite.Ignition;
+import org.apache.ignite.cluster.ClusterState;
+import org.apache.ignite.configuration.DataStorageConfiguration;
 import org.apache.ignite.configuration.IgniteConfiguration;
+import org.apache.ignite.internal.util.function.ThrowableSupplier;
+import org.apache.ignite.internal.util.lang.IgnitePair;
+import org.apache.ignite.internal.util.lang.RunnableX;
+import org.apache.ignite.internal.util.typedef.F;
+import org.apache.ignite.internal.util.typedef.X;
 import org.apache.ignite.lang.IgniteProductVersion;
+import org.apache.ignite.spi.IgniteSpiException;
 import org.apache.ignite.spi.discovery.tcp.TcpDiscoverySpi;
+import org.apache.ignite.testframework.GridTestUtils;
 import org.apache.ignite.testframework.junits.common.GridCommonAbstractTest;
 import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+
+import static org.apache.ignite.testframework.GridTestUtils.assertThrows;
+import static org.apache.ignite.testframework.GridTestUtils.waitForCondition;
+import static org.junit.Assume.assumeTrue;
 
 /**
- * Test grids starting with non compatible release types.
+ * Test Rolling Upgrade release types.
  */
+@RunWith(Parameterized.class)
 public class GridReleaseTypeSelfTest extends GridCommonAbstractTest {
     /** */
     private String nodeVer;
 
+    /** Is client. */

Review Comment:
   Who?



##########
modules/core/src/main/java/org/apache/ignite/internal/processors/rollingupgrade/RollingUpgradeProcessor.java:
##########
@@ -0,0 +1,310 @@
+/*
+ * 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.rollingupgrade;
+
+import java.util.HashSet;
+import java.util.Objects;
+import java.util.Set;
+import org.apache.ignite.IgniteCheckedException;
+import org.apache.ignite.IgniteException;
+import org.apache.ignite.cluster.ClusterNode;
+import org.apache.ignite.internal.GridKernalContext;
+import org.apache.ignite.internal.processors.GridProcessorAdapter;
+import 
org.apache.ignite.internal.processors.metastorage.DistributedMetaStorage;
+import 
org.apache.ignite.internal.processors.metastorage.DistributedMetastorageLifecycleListener;
+import 
org.apache.ignite.internal.processors.metastorage.ReadableDistributedMetaStorage;
+import 
org.apache.ignite.internal.processors.nodevalidation.DiscoveryNodeValidationProcessor;
+import org.apache.ignite.internal.util.lang.IgnitePair;
+import org.apache.ignite.internal.util.typedef.F;
+import org.apache.ignite.internal.util.typedef.internal.LT;
+import org.apache.ignite.internal.util.typedef.internal.U;
+import org.apache.ignite.lang.IgniteProductVersion;
+import org.apache.ignite.spi.IgniteNodeValidationResult;
+import org.apache.ignite.spi.discovery.tcp.TcpDiscoverySpi;
+import org.apache.ignite.spi.discovery.tcp.internal.TcpDiscoveryNodesRing;
+import org.jetbrains.annotations.Nullable;
+
+import static org.apache.ignite.internal.IgniteNodeAttributes.ATTR_BUILD_VER;
+import static 
org.apache.ignite.internal.processors.metastorage.DistributedMetaStorage.IGNITE_INTERNAL_KEY_PREFIX;
+
+/** Rolling upgrade processor. Manages current and target versions of cluster. 
*/
+public class RollingUpgradeProcessor extends GridProcessorAdapter implements 
DiscoveryNodeValidationProcessor {
+    /** Key for the distributed property that holds current and target 
versions. */
+    private static final String ROLLING_UPGRADE_VERSIONS_KEY = 
IGNITE_INTERNAL_KEY_PREFIX + "rolling.upgrade.versions";
+
+    /** Metastorage with the write access. */
+    @Nullable private volatile DistributedMetaStorage metastorage;
+
+    /** TCP discovery nodes ring. */
+    private TcpDiscoveryNodesRing ring;
+
+    /** Last joining node. */
+    private ClusterNode lastJoiningNode;
+
+    /** Last joining node timestamp. */
+    private long lastJoiningNodeTimestamp;
+
+    /** Lock for synchronization between tcp-disco-msg-worker thread and 
management operations. */
+    private final Object lock = new Object();
+
+    /** Pair with current and target versions. */
+    private volatile IgnitePair<IgniteProductVersion> verPair = null;
+
+    /**
+     * @param ctx Context.
+     */
+    public RollingUpgradeProcessor(GridKernalContext ctx) {
+        super(ctx);
+    }
+
+    /** {@inheritDoc} */
+    @Override public void start() throws IgniteCheckedException {
+        
ctx.internalSubscriptionProcessor().registerDistributedMetastorageListener(new 
DistributedMetastorageLifecycleListener() {
+            @Override public void onReadyForWrite(DistributedMetaStorage 
metastorage) {
+                RollingUpgradeProcessor.this.metastorage = metastorage;
+            }
+
+            @Override public void 
onReadyForRead(ReadableDistributedMetaStorage metastorage) {
+                try {
+                    verPair = metastorage.read(ROLLING_UPGRADE_VERSIONS_KEY);
+                }
+                catch (IgniteCheckedException e) {
+                    throw new IgniteException(e);
+                }
+
+                // Keep the current and target version pair in sync with 
metastorage updates, e.g., to handle coordinator changes.
+                metastorage.listen(ROLLING_UPGRADE_VERSIONS_KEY::equals, (key, 
oldVal, newVal) -> {
+                    verPair = (IgnitePair<IgniteProductVersion>)newVal;
+                });
+            }
+        });
+    }
+
+    /** {@inheritDoc} The joining node is stored to verify later whether it 
successfully connected to the ring or failed to join. */
+    @Override public @Nullable IgniteNodeValidationResult 
validateNode(ClusterNode node) {
+        synchronized (lock) {
+            lastJoiningNode = node;
+
+            lastJoiningNodeTimestamp = U.currentTimeMillis();
+        }
+
+        ClusterNode locNode = ctx.discovery().localNode();
+
+        String locBuildVer = locNode.attribute(ATTR_BUILD_VER);
+        String rmtBuildVer = node.attribute(ATTR_BUILD_VER);
+
+        IgniteProductVersion rmtVer = 
IgniteProductVersion.fromString(rmtBuildVer);
+
+        IgnitePair<IgniteProductVersion> pair = verPair;
+
+        if (pair == null)
+            pair = F.pair(IgniteProductVersion.fromString(locBuildVer), null);

Review Comment:
   No need to build this variable:
   
   ```
   curVer = pair == null ? IgniteProductVersion.fromString(locBuildVer) : 
pair.get1();
   targetVer = pair == null ? null : pair.get2()
   ```



##########
modules/core/src/main/java/org/apache/ignite/internal/processors/rollingupgrade/RollingUpgradeProcessor.java:
##########
@@ -0,0 +1,310 @@
+/*
+ * 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.rollingupgrade;
+
+import java.util.HashSet;
+import java.util.Objects;
+import java.util.Set;
+import org.apache.ignite.IgniteCheckedException;
+import org.apache.ignite.IgniteException;
+import org.apache.ignite.cluster.ClusterNode;
+import org.apache.ignite.internal.GridKernalContext;
+import org.apache.ignite.internal.processors.GridProcessorAdapter;
+import 
org.apache.ignite.internal.processors.metastorage.DistributedMetaStorage;
+import 
org.apache.ignite.internal.processors.metastorage.DistributedMetastorageLifecycleListener;
+import 
org.apache.ignite.internal.processors.metastorage.ReadableDistributedMetaStorage;
+import 
org.apache.ignite.internal.processors.nodevalidation.DiscoveryNodeValidationProcessor;
+import org.apache.ignite.internal.util.lang.IgnitePair;
+import org.apache.ignite.internal.util.typedef.F;
+import org.apache.ignite.internal.util.typedef.internal.LT;
+import org.apache.ignite.internal.util.typedef.internal.U;
+import org.apache.ignite.lang.IgniteProductVersion;
+import org.apache.ignite.spi.IgniteNodeValidationResult;
+import org.apache.ignite.spi.discovery.tcp.TcpDiscoverySpi;
+import org.apache.ignite.spi.discovery.tcp.internal.TcpDiscoveryNodesRing;
+import org.jetbrains.annotations.Nullable;
+
+import static org.apache.ignite.internal.IgniteNodeAttributes.ATTR_BUILD_VER;
+import static 
org.apache.ignite.internal.processors.metastorage.DistributedMetaStorage.IGNITE_INTERNAL_KEY_PREFIX;
+
+/** Rolling upgrade processor. Manages current and target versions of cluster. 
*/
+public class RollingUpgradeProcessor extends GridProcessorAdapter implements 
DiscoveryNodeValidationProcessor {
+    /** Key for the distributed property that holds current and target 
versions. */
+    private static final String ROLLING_UPGRADE_VERSIONS_KEY = 
IGNITE_INTERNAL_KEY_PREFIX + "rolling.upgrade.versions";
+
+    /** Metastorage with the write access. */
+    @Nullable private volatile DistributedMetaStorage metastorage;
+
+    /** TCP discovery nodes ring. */
+    private TcpDiscoveryNodesRing ring;
+
+    /** Last joining node. */
+    private ClusterNode lastJoiningNode;
+
+    /** Last joining node timestamp. */
+    private long lastJoiningNodeTimestamp;
+
+    /** Lock for synchronization between tcp-disco-msg-worker thread and 
management operations. */
+    private final Object lock = new Object();
+
+    /** Pair with current and target versions. */
+    private volatile IgnitePair<IgniteProductVersion> verPair = null;

Review Comment:
   rollUpVers?



##########
modules/core/src/test/java/org/apache/ignite/internal/GridReleaseTypeSelfTest.java:
##########
@@ -51,67 +84,406 @@ public class GridReleaseTypeSelfTest extends 
GridCommonAbstractTest {
 
         cfg.setDiscoverySpi(discoSpi);
 
+        DataStorageConfiguration storageCfg = new DataStorageConfiguration();
+
+        
storageCfg.getDefaultDataRegionConfiguration().setPersistenceEnabled(persistence);
+
+        cfg.setDataStorageConfiguration(storageCfg);
+
         return cfg;
     }
 
     /** {@inheritDoc} */
     @Override protected void afterTest() throws Exception {
         stopAllGrids();
+        cleanPersistenceDir();
     }
 
-    /**
-     * @throws Exception If failed.
-     */
+    /** */
+    @Test
+    public void testTwoConflictVersions() {

Review Comment:
   Why this test runs 25sec? And other tests for 5 sec? Is there any timeout we 
are waiting for?



##########
modules/core/src/main/java/org/apache/ignite/spi/discovery/tcp/ServerImpl.java:
##########
@@ -2997,6 +2998,12 @@ private RingMessageWorker(IgniteLogger log) {
 
                 runTasks();
             });
+
+            if (spi.ignite() instanceof IgniteEx) {
+                RollingUpgradeProcessor rollingUpgradeProcessor = 
((IgniteEx)spi.ignite()).context().rollingUpgrade();
+                if (rollingUpgradeProcessor != null)

Review Comment:
   Let's move this code to ServerImpl#spiStart before `joinTopology()` call. We 
should call callback to spi here. TestTcpDiscoverySpi in the test should do 
nothing in this callback 



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