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   * 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
  * Unless required by applicable law or agreed to in writing,
  * software distributed under the License is distributed on an
  * KIND, either express or implied.  See the License for the
  * specific language governing permissions and limitations
  * under the License.
 public class FileChannelConfiguration {
Directory Checkpoints will be written in
   public static final String CHECKPOINT_DIR = "checkpointDir";

The directory to which the checkpoint must be backed up
   public static final String BACKUP_CHECKPOINT_DIR = "backupCheckpointDir";

Directories data files will be written in. Multiple directories can be specified as comma separated values. Writes will be written in a round robin fashion.
   public static final String DATA_DIRS = "dataDirs";
Maximum number of put/take events in a transaction. Default: 1000
   public static final String TRANSACTION_CAPACITY = "transactionCapacity";
   public static final int DEFAULT_TRANSACTION_CAPACITY = 10000;
Interval at which checkpoints should be taken. Default 30s (ms)
   public static final String CHECKPOINT_INTERVAL = "checkpointInterval";
   public static final long DEFAULT_CHECKPOINT_INTERVAL = 30L * 1000L;
Max file size for data files, cannot exceed the default. Default~ 1.5GB
   public static final String MAX_FILE_SIZE = "maxFileSize";
   public static final long DEFAULT_MAX_FILE_SIZE =
         . - (500L * 1024L * 1024L); // ~1.52 G
   public static final String MINIMUM_REQUIRED_SPACE = "minimumRequiredSpace";
Minimum space required defaults to 500MB
   public static final long DEFAULT_MINIMUM_REQUIRED_SPACE = 500L * 1024L * 1024L;
Minimum space floor is 1MB
   public static final long FLOOR_MINIMUM_REQUIRED_SPACE = 1L * 1024L * 1024L;

Maximum capacity of the channel. Default: 1,000,000
   public static final String CAPACITY = "capacity";
   public static final int DEFAULT_CAPACITY = 1000000;
The length of time we will wait for space available to do a Put. Default: 3 (seconds)
   public static final String KEEP_ALIVE = "keep-alive";
   public static final int DEFAULT_KEEP_ALIVE = 3;

Turn on Flume 1.2 log replay logic
   public static final String USE_LOG_REPLAY_V1 = "use-log-replay-v1";
   public static final boolean DEFAULT_USE_LOG_REPLAY_V1 = false;
   public static final String USE_FAST_REPLAY = "use-fast-replay";
   public static final boolean DEFAULT_USE_FAST_REPLAY = false;
   public static final String USE_DUAL_CHECKPOINTS = "useDualCheckpoints";
   public static final boolean DEFAULT_USE_DUAL_CHECKPOINTS = false;
   public static final String COMPRESS_BACKUP_CHECKPOINT =
   public static final boolean DEFAULT_COMPRESS_BACKUP_CHECKPOINT
     = false;
   public static final String FSYNC_PER_TXN = "fsyncPerTransaction";
   public static final boolean DEFAULT_FSYNC_PRE_TXN = true;
   public static final String FSYNC_INTERVAL = "fsyncInterval";
   public static final int DEFAULT_FSYNC_INTERVAL = 5; // seconds.
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