hadoop CheckpointConf 源码

haddop CheckpointConf 代码

文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/CheckpointConf.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.namenode;

import static org.apache.hadoop.hdfs.DFSConfigKeys.*;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;

import org.apache.hadoop.thirdparty.com.google.common.collect.ImmutableList;

import java.util.concurrent.TimeUnit;

@InterfaceAudience.Private
public class CheckpointConf {
  private static final Logger LOG =
      LoggerFactory.getLogger(CheckpointConf.class);
  
  /** How often to checkpoint regardless of number of txns */
  private final long checkpointPeriod;    // in seconds
  
  /** How often to poll the NN to check checkpointTxnCount */
  private final long checkpointCheckPeriod; // in seconds
  
  /** checkpoint once every this many transactions, regardless of time */
  private final long checkpointTxnCount;

  /** maxium number of retries when merge errors occur */
  private final int maxRetriesOnMergeError;

  /** The output dir for legacy OIV image */
  private final String legacyOivImageDir;

  /**
  * multiplier on the checkpoint period to allow other nodes to do the checkpointing, when not the
  * 'primary' checkpoint node
  */
  private double quietMultiplier;

  public CheckpointConf(Configuration conf) {
    checkpointCheckPeriod = conf.getTimeDuration(
        DFS_NAMENODE_CHECKPOINT_CHECK_PERIOD_KEY,
        DFS_NAMENODE_CHECKPOINT_CHECK_PERIOD_DEFAULT, TimeUnit.SECONDS);
        
    checkpointPeriod = conf.getTimeDuration(DFS_NAMENODE_CHECKPOINT_PERIOD_KEY,
        DFS_NAMENODE_CHECKPOINT_PERIOD_DEFAULT, TimeUnit.SECONDS);
    checkpointTxnCount = conf.getLong(DFS_NAMENODE_CHECKPOINT_TXNS_KEY, 
                                  DFS_NAMENODE_CHECKPOINT_TXNS_DEFAULT);
    maxRetriesOnMergeError = conf.getInt(DFS_NAMENODE_CHECKPOINT_MAX_RETRIES_KEY,
                                  DFS_NAMENODE_CHECKPOINT_MAX_RETRIES_DEFAULT);
    legacyOivImageDir = conf.get(DFS_NAMENODE_LEGACY_OIV_IMAGE_DIR_KEY);
    quietMultiplier = conf.getDouble(DFS_NAMENODE_CHECKPOINT_QUIET_MULTIPLIER_KEY,
      DFS_NAMENODE_CHECKPOINT_QUIET_MULTIPLIER_DEFAULT);
    warnForDeprecatedConfigs(conf);
  }
  
  private static void warnForDeprecatedConfigs(Configuration conf) {
    for (String key : ImmutableList.of(
          "fs.checkpoint.size",
          "dfs.namenode.checkpoint.size")) {
      if (conf.get(key) != null) {
        LOG.warn("Configuration key " + key + " is deprecated! Ignoring..." +
            " Instead please specify a value for " +
            DFS_NAMENODE_CHECKPOINT_TXNS_KEY);
      }
    }
  }

  public long getPeriod() {
    return checkpointPeriod;
  }

  public long getCheckPeriod() {
    return Math.min(checkpointCheckPeriod, checkpointPeriod);
  }

  public long getTxnCount() {
    return checkpointTxnCount;
  }

  public int getMaxRetriesOnMergeError() {
    return maxRetriesOnMergeError;
  }

  public String getLegacyOivImageDir() {
    return legacyOivImageDir;
  }

  public double getQuietPeriod() {
    return this.checkpointPeriod * this.quietMultiplier;
  }
}

相关信息

hadoop 源码目录

相关文章

hadoop AclEntryStatusFormat 源码

hadoop AclFeature 源码

hadoop AclStorage 源码

hadoop AclTransformation 源码

hadoop AuditLogger 源码

hadoop BackupImage 源码

hadoop BackupJournalManager 源码

hadoop BackupNode 源码

hadoop BackupState 源码

hadoop CacheManager 源码