/**
* 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.server.protocol;
public class BlockFlags {
/**
* This constant is used to indicate that the block deletion does not need
* explicit ACK from the datanode. When a block is put into the list of blocks
* to be deleted, it's size is set to this constant. We assume that no block
* would actually have this size. Otherwise, we would miss ACKs for blocks
* with such size. Positive number is used for compatibility reasons.
*/
public static final long NO_ACK = Long.MAX_VALUE;
/**
* The flag indicating the the block has been deleted, when sending
* block reports.
*/
public static final long DELETED = Long.MAX_VALUE - 1;
/**
* When sending incremental block reports there are situations when we cannot
* process a particular block on a standby node, because the node has still
* not processed the edits entirely. This flag marks the block to be ignored
* by the namenode - the block will be re-processed at a later time
*/
public static final long IGNORE = Long.MAX_VALUE - 2;
}