org.apache.hadoop.hive.io.HiveIOExceptionHandlerUtil Maven / Gradle / Ivy
/**
* 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.hadoop.hive.io;
import java.io.IOException;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.RecordReader;
public class HiveIOExceptionHandlerUtil {
private static ThreadLocal handlerChainInstance =
new ThreadLocal();
private static HiveIOExceptionHandlerChain get(JobConf job) {
HiveIOExceptionHandlerChain cache = HiveIOExceptionHandlerUtil.handlerChainInstance
.get();
if (cache == null) {
HiveIOExceptionHandlerChain toSet = HiveIOExceptionHandlerChain
.getHiveIOExceptionHandlerChain(job);
handlerChainInstance.set(toSet);
cache = HiveIOExceptionHandlerUtil.handlerChainInstance.get();
}
return cache;
}
/**
* Handle exception thrown when creating record reader. In case that there is
* an exception raised when construction the record reader and one handler can
* handle this exception, it should return an record reader, which is either a
* dummy empty record reader or a specific record reader that do some magic.
*
* @param e
* @param job
* @return RecordReader
* @throws IOException
*/
public static RecordReader handleRecordReaderCreationException(Exception e,
JobConf job) throws IOException {
HiveIOExceptionHandlerChain ioExpectionHandlerChain = get(job);
if (ioExpectionHandlerChain != null) {
return ioExpectionHandlerChain.handleRecordReaderCreationException(e);
}
throw new IOException(e);
}
/**
* Handle exception thrown when calling record reader's next. If this
* exception is handled by one handler, will just return true. Otherwise,
* either re-throw this exception in one handler or at the end of the handler
* chain.
*
* @param e
* @param job
* @return true on success
* @throws IOException
*/
public static boolean handleRecordReaderNextException(Exception e, JobConf job)
throws IOException {
HiveIOExceptionHandlerChain ioExpectionHandlerChain = get(job);
if (ioExpectionHandlerChain != null) {
return ioExpectionHandlerChain.handleRecordReaderNextException(e);
}
throw new IOException(e);
}
}