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ASF GitHub Bot commented on DRILL-6053: --------------------------------------- Github user arina-ielchiieva commented on a diff in the pull request: https://github.com/apache/drill/pull/1163#discussion_r174432531 --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/store/sys/store/VersionedDelegatingStore.java --- @@ -0,0 +1,118 @@ +/* + * 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.drill.exec.store.sys.store; + +import java.util.Iterator; +import java.util.Map; +import java.util.concurrent.locks.ReadWriteLock; +import java.util.concurrent.locks.ReentrantReadWriteLock; + +import org.apache.drill.common.AutoCloseables.Closeable; +import org.apache.drill.common.concurrent.AutoCloseableLock; +import org.apache.drill.exec.exception.VersionMismatchException; +import org.apache.drill.exec.store.sys.PersistentStore; +import org.apache.drill.exec.store.sys.PersistentStoreMode; +import org.apache.drill.exec.store.sys.VersionedPersistentStore; + +public class VersionedDelegatingStore<V> implements VersionedPersistentStore<V> +{ + private final PersistentStore<V> store; + private final ReadWriteLock readWriteLock; + private final AutoCloseableLock readLock; + private final AutoCloseableLock writeLock; + private int version; + + public VersionedDelegatingStore(PersistentStore<V> store) { + this.store = store; + readWriteLock = new ReentrantReadWriteLock(); + readLock = new AutoCloseableLock(readWriteLock.readLock()); + writeLock = new AutoCloseableLock(readWriteLock.writeLock()); + version = -1; + } + + @Override + public PersistentStoreMode getMode() + { --- End diff -- Please move to the upper line. > Avoid excessive locking in LocalPersistentStore > ----------------------------------------------- > > Key: DRILL-6053 > URL: https://issues.apache.org/jira/browse/DRILL-6053 > Project: Apache Drill > Issue Type: Improvement > Reporter: Vlad Rozov > Assignee: Vlad Rozov > Priority: Major > Fix For: 1.14.0 > > > When query profiles are written to LocalPersistentStore, the write is > unnecessary serialized due to read/write lock that was introduced for > versioned PersistentStore. Only versioned access needs to be protected by > read/write lock. -- This message was sent by Atlassian JIRA (v7.6.3#76005)