hadoop BlockConstructionStage 源码
haddop BlockConstructionStage 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/protocol/datatransfer/BlockConstructionStage.java
/**
* 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.hdfs.protocol.datatransfer;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
/** Block Construction Stage */
@InterfaceAudience.Private
@InterfaceStability.Evolving
public enum BlockConstructionStage {
/** The enumerates are always listed as regular stage followed by the
* recovery stage.
* Changing this order will make getRecoveryStage not working.
*/
// pipeline set up for block append
PIPELINE_SETUP_APPEND,
// pipeline set up for failed PIPELINE_SETUP_APPEND recovery
PIPELINE_SETUP_APPEND_RECOVERY,
// data streaming
DATA_STREAMING,
// pipeline setup for failed data streaming recovery
PIPELINE_SETUP_STREAMING_RECOVERY,
// close the block and pipeline
PIPELINE_CLOSE,
// Recover a failed PIPELINE_CLOSE
PIPELINE_CLOSE_RECOVERY,
// pipeline set up for block creation
PIPELINE_SETUP_CREATE,
// transfer RBW for adding datanodes
TRANSFER_RBW,
// transfer Finalized for adding datanodes
TRANSFER_FINALIZED;
final static private byte RECOVERY_BIT = (byte)1;
/**
* get the recovery stage of this stage
*/
public BlockConstructionStage getRecoveryStage() {
if (this == PIPELINE_SETUP_CREATE) {
throw new IllegalArgumentException( "Unexpected blockStage " + this);
} else {
return values()[ordinal()|RECOVERY_BIT];
}
}
}
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