chesnokoff commented on code in PR #12301: URL: https://github.com/apache/ignite/pull/12301#discussion_r2435344920
########## modules/core/src/main/java/org/apache/ignite/internal/processors/rollingupgrade/RollingUpgradeProcessor.java: ########## @@ -0,0 +1,132 @@ +/* + * 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.Objects; +import java.util.concurrent.atomic.AtomicReference; +import org.apache.ignite.IgniteCheckedException; +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.util.lang.IgnitePair; +import org.apache.ignite.internal.util.typedef.F; +import org.apache.ignite.internal.util.typedef.internal.A; +import org.apache.ignite.lang.IgniteProductVersion; +import org.jetbrains.annotations.NotNull; +import org.jetbrains.annotations.Nullable; + +import static org.apache.ignite.internal.IgniteNodeAttributes.ATTR_BUILD_VER; + +/** Rolling upgrade processor. Manages current and target versions of cluster. */ +public class RollingUpgradeProcessor extends GridProcessorAdapter { + /** Key for the distributed property that holds current and target versions. */ + private static final String ROLL_UP_VERSIONS = "rolling.upgrade.versions"; + + /** Metastorage with the write access. */ + @Nullable private volatile DistributedMetaStorage metastorage; + + /** Distributed property that holds current and target version. */ + private final AtomicReference<IgnitePair<IgniteProductVersion>> verPairHolder = new AtomicReference<>(); + + /** + * @param ctx Context. + */ + public RollingUpgradeProcessor(GridKernalContext ctx) { + super(ctx); + } + + /** {@inheritDoc} */ + @Override public void start() throws IgniteCheckedException { + ctx.internalSubscriptionProcessor().registerDistributedMetastorageListener(new DistributedMetastorageLifecycleListener() { + @Override public void onReadyForRead(ReadableDistributedMetaStorage metastorage) { + try { + IgnitePair<IgniteProductVersion> pair = metastorage.read(ROLL_UP_VERSIONS); + + if (verPairHolder.compareAndSet(null, pair) && log.isDebugEnabled()) + log.debug("Read current and target versions from metastore: " + pair); + } + catch (IgniteCheckedException e) { + if (log.isDebugEnabled()) + log.debug("Could not read current and target versions: " + e.getMessage()); + } + + metastorage.listen(ROLL_UP_VERSIONS::equals, (key, oldVal, newVal) -> + verPairHolder.compareAndSet((IgnitePair<IgniteProductVersion>)oldVal, (IgnitePair<IgniteProductVersion>)newVal) + ); + } + + @Override public void onReadyForWrite(DistributedMetaStorage metastorage) { + RollingUpgradeProcessor.this.metastorage = metastorage; + } + }); + } + + /** + * @param current Current version. + * @param target Target version. + */ + public void versions(@NotNull IgniteProductVersion current, @NotNull IgniteProductVersion target) throws IgniteCheckedException { + A.notNull(metastorage, "Metastorage not ready. Node not started?"); + + if (checkVersions(current, target)) + metastorage.write(ROLL_UP_VERSIONS, F.pair(current, target)); + } + + /** + * Returns a pair containing the current and target versions of the cluster. + * + * @return A pair where: + * <ul> + * <li><b>First element</b> — current version of the cluster.</li> + * <li><b>Second element</b> — target version to which the cluster is being upgraded.</li> + * </ul> + */ + public IgnitePair<IgniteProductVersion> versions() { Review Comment: Probably it is confusing to understand what is get0 and what is get1 -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
