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Diffstat (limited to 'sql/hive-thriftserver/src/main/java/org/apache/hive/service/server/ThreadFactoryWithGarbageCleanup.java')
-rw-r--r-- | sql/hive-thriftserver/src/main/java/org/apache/hive/service/server/ThreadFactoryWithGarbageCleanup.java | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/sql/hive-thriftserver/src/main/java/org/apache/hive/service/server/ThreadFactoryWithGarbageCleanup.java b/sql/hive-thriftserver/src/main/java/org/apache/hive/service/server/ThreadFactoryWithGarbageCleanup.java new file mode 100644 index 0000000000..fb8141a905 --- /dev/null +++ b/sql/hive-thriftserver/src/main/java/org/apache/hive/service/server/ThreadFactoryWithGarbageCleanup.java @@ -0,0 +1,64 @@ +/** + * 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.hive.service.server; + +import java.util.Map; +import java.util.concurrent.ConcurrentHashMap; +import java.util.concurrent.ThreadFactory; + +import org.apache.hadoop.hive.metastore.RawStore; + +/** + * A ThreadFactory for constructing new HiveServer2 threads that lets you plug + * in custom cleanup code to be called before this thread is GC-ed. + * Currently cleans up the following: + * 1. ThreadLocal RawStore object: + * In case of an embedded metastore, HiveServer2 threads (foreground & background) + * end up caching a ThreadLocal RawStore object. The ThreadLocal RawStore object has + * an instance of PersistenceManagerFactory & PersistenceManager. + * The PersistenceManagerFactory keeps a cache of PersistenceManager objects, + * which are only removed when PersistenceManager#close method is called. + * HiveServer2 uses ExecutorService for managing thread pools for foreground & background threads. + * ExecutorService unfortunately does not provide any hooks to be called, + * when a thread from the pool is terminated. + * As a solution, we're using this ThreadFactory to keep a cache of RawStore objects per thread. + * And we are doing clean shutdown in the finalizer for each thread. + */ +public class ThreadFactoryWithGarbageCleanup implements ThreadFactory { + + private static Map<Long, RawStore> threadRawStoreMap = new ConcurrentHashMap<Long, RawStore>(); + + private final String namePrefix; + + public ThreadFactoryWithGarbageCleanup(String threadPoolName) { + namePrefix = threadPoolName; + } + + @Override + public Thread newThread(Runnable runnable) { + Thread newThread = new ThreadWithGarbageCleanup(runnable); + newThread.setName(namePrefix + ": Thread-" + newThread.getId()); + return newThread; + } + + public static Map<Long, RawStore> getThreadRawStoreMap() { + return threadRawStoreMap; + } +} |