spark RocksDBLoader 源码
spark RocksDBLoader 代码
文件路径：/sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/state/RocksDBLoader.scala
/*
* 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.spark.sql.execution.streaming.state
import org.rocksdb.{RocksDB => NativeRocksDB}
import org.apache.spark.internal.Logging
import org.apache.spark.util.UninterruptibleThread
/**
* A wrapper for RocksDB library loading using an uninterruptible thread, as the native RocksDB
* code will throw an error when interrupted.
*/
object RocksDBLoader extends Logging {
/**
* Keep tracks of the exception thrown from the loading thread, if any.
*/
private var exception: Option[Throwable] = null
private val loadLibraryThread = new UninterruptibleThread("RocksDBLoader") {
override def run(): Unit = {
try {
runUninterruptibly {
NativeRocksDB.loadLibrary()
exception = None
}
} catch {
case e: Throwable =>
exception = Some(e)
}
}
}
def loadLibrary(): Unit = synchronized {
if (exception == null) {
// SPARK-39847: if a task thread is interrupted while blocking in this loadLibrary()
// call then a second task thread might start a loadLibrary() call while the first
// call's loadLibraryThread is still running. Checking loadLibraryThread's state here
// ensures that the second loadLibrary() call will wait for the original call's
// loadLibraryThread to complete. If we didn't have this call then the second
// loadLibraryCall() would call start() on an already-started thread, causing a
// java.lang.IllegalThreadStateException error.
if (loadLibraryThread.getState == Thread.State.NEW) {
loadLibraryThread.start()
}
logInfo("RocksDB library loading thread started")
loadLibraryThread.join()
exception.foreach(throw _)
logInfo("RocksDB library loading thread finished successfully")
} else {
exception.foreach(throw _)
}
}
}
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