hadoop VolumeFailureInfo 源码

haddop VolumeFailureInfo 代码

文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/VolumeFailureInfo.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.server.datanode.fsdataset.impl;

import org.apache.hadoop.hdfs.server.datanode.StorageLocation;

/**
 * Tracks information about failure of a data volume.
 */
final class VolumeFailureInfo {
  private final StorageLocation failedStorageLocation;
  private final long failureDate;
  private final long estimatedCapacityLost;

  /**
   * Creates a new VolumeFailureInfo, when the capacity lost from this volume
   * failure is unknown.  Typically, this means the volume failed immediately at
   * startup, so there was never a chance to query its capacity.
   *
   * @param failedStorageLocation storage location that has failed
   * @param failureDate date/time of failure in milliseconds since epoch
   */
  public VolumeFailureInfo(StorageLocation failedStorageLocation,
      long failureDate) {
    this(failedStorageLocation, failureDate, 0);
  }

  /**
   * Creates a new VolumeFailureInfo.
   *
   * @param failedStorageLocation storage location that has failed
   * @param failureDate date/time of failure in milliseconds since epoch
   * @param estimatedCapacityLost estimate of capacity lost in bytes
   */
  public VolumeFailureInfo(StorageLocation failedStorageLocation,
      long failureDate, long estimatedCapacityLost) {
    this.failedStorageLocation = failedStorageLocation;
    this.failureDate = failureDate;
    this.estimatedCapacityLost = estimatedCapacityLost;
  }

  /**
   * Returns the storage location that has failed.
   *
   * @return storage location that has failed
   */
  public StorageLocation getFailedStorageLocation() {
    return this.failedStorageLocation;
  }

  /**
   * Returns date/time of failure
   *
   * @return date/time of failure in milliseconds since epoch
   */
  public long getFailureDate() {
    return this.failureDate;
  }

  /**
   * Returns estimate of capacity lost.  This is said to be an estimate, because
   * in some cases it's impossible to know the capacity of the volume, such as if
   * we never had a chance to query its capacity before the failure occurred.
   *
   * @return estimate of capacity lost in bytes
   */
  public long getEstimatedCapacityLost() {
    return this.estimatedCapacityLost;
  }
}

相关信息

hadoop 源码目录

相关文章

hadoop AddBlockPoolException 源码

hadoop BlockPoolSlice 源码

hadoop CacheStats 源码

hadoop FsDatasetAsyncDiskService 源码

hadoop FsDatasetCache 源码

hadoop FsDatasetFactory 源码

hadoop FsDatasetImpl 源码

hadoop FsDatasetUtil 源码

hadoop FsVolumeImpl 源码

hadoop FsVolumeImplBuilder 源码