core/src/main/java/org/apache/accumulo/core/Constants.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.accumulo.core;

import static java.nio.charset.StandardCharsets.UTF_8;

import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;

import org.apache.accumulo.core.security.Authorizations;

public class Constants {

  public static final String VERSION = FilteredConstants.VERSION;

  // Zookeeper locations
  public static final String ZROOT = "/accumulo";
  public static final String ZINSTANCES = "/instances";

  public static final String ZTABLES = "/tables";
  public static final byte[] ZTABLES_INITIAL_ID = {'0'};
  public static final String ZTABLE_NAME = "/name";
  public static final String ZTABLE_CONF = "/conf";
  public static final String ZTABLE_STATE = "/state";
  public static final String ZTABLE_FLUSH_ID = "/flush-id";
  public static final String ZTABLE_COMPACT_ID = "/compact-id";
  public static final String ZTABLE_COMPACT_CANCEL_ID = "/compact-cancel-id";
  public static final String ZTABLE_NAMESPACE = "/namespace";

  public static final String ZNAMESPACES = "/namespaces";
  public static final String ZNAMESPACE_NAME = "/name";
  public static final String ZNAMESPACE_CONF = "/conf";

  public static final String ZMASTERS = "/masters";
  public static final String ZMASTER_LOCK = ZMASTERS + "/lock";
  public static final String ZMASTER_GOAL_STATE = ZMASTERS + "/goal_state";
  public static final String ZMASTER_REPLICATION_COORDINATOR_ADDR = ZMASTERS + "/repl_coord_addr";
  public static final String ZMASTER_TICK = ZMASTERS + "/tick";

  public static final String ZGC = "/gc";
  public static final String ZGC_LOCK = ZGC + "/lock";

  public static final String ZMONITOR = "/monitor";
  public static final String ZMONITOR_LOCK = ZMONITOR + "/lock";
  public static final String ZMONITOR_HTTP_ADDR = ZMONITOR + "/http_addr";
  public static final String ZMONITOR_LOG4J_ADDR = ZMONITOR + "/log4j_addr";

  public static final String ZCONFIG = "/config";

  public static final String ZTSERVERS = "/tservers";

  public static final String ZDEAD = "/dead";
  public static final String ZDEADTSERVERS = ZDEAD + "/tservers";

  public static final String ZTRACERS = "/tracers";

  public static final String ZPROBLEMS = "/problems";

  public static final String BULK_ARBITRATOR_TYPE = "bulkTx";

  public static final String ZFATE = "/fate";

  public static final String ZNEXT_FILE = "/next_file";

  public static final String ZBULK_FAILED_COPYQ = "/bulk_failed_copyq";

  public static final String ZHDFS_RESERVATIONS = "/hdfs_reservations";
  public static final String ZRECOVERY = "/recovery";

  /**
   * Base znode for storing secret keys that back delegation tokens
   */
  public static final String ZDELEGATION_TOKEN_KEYS = "/delegation_token_keys";

  /**
   * Initial tablet directory name for the default tablet in all tables
   */
  public static final String DEFAULT_TABLET_LOCATION = "/default_tablet";

  public static final String ZTABLE_LOCKS = "/table_locks";

  public static final String BULK_PREFIX = "b-";
  public static final String BULK_RENAME_FILE = "renames.json";
  public static final String BULK_LOAD_MAPPING = "loadmap.json";

  public static final String CLONE_PREFIX = "c-";
  public static final byte[] CLONE_PREFIX_BYTES = CLONE_PREFIX.getBytes(UTF_8);

  // this affects the table client caching of metadata
  public static final int SCAN_BATCH_SIZE = 1000;

  // Scanners will default to fetching 3 batches of Key/Value pairs before asynchronously
  // fetching the next batch.
  public static final long SCANNER_DEFAULT_READAHEAD_THRESHOLD = 3L;

  // Security configuration
  public static final String PW_HASH_ALGORITHM = "SHA-256";

  /**
   * @deprecated since 1.6.0; Use {@link Authorizations#EMPTY} instead
   */
  @Deprecated
  public static final Authorizations NO_AUTHS = Authorizations.EMPTY;

  public static final int MAX_DATA_TO_PRINT = 64;
  public static final String CORE_PACKAGE_NAME = "org.apache.accumulo.core";
  public static final String MAPFILE_EXTENSION = "map";
  public static final String GENERATED_TABLET_DIRECTORY_PREFIX = "t-";

  public static final String EXPORT_METADATA_FILE = "metadata.bin";
  public static final String EXPORT_TABLE_CONFIG_FILE = "table_config.txt";
  public static final String EXPORT_FILE = "exportMetadata.zip";
  public static final String EXPORT_INFO_FILE = "accumulo_export_info.txt";

  // Variables that will be substituted with environment vars in PropertyType.PATH values
  public static final Collection<String> PATH_PROPERTY_ENV_VARS = Collections
      .unmodifiableCollection(Arrays.asList("ACCUMULO_HOME", "ACCUMULO_CONF_DIR"));

  public static final String HDFS_TABLES_DIR = "/tables";

  public static final int DEFAULT_VISIBILITY_CACHE_SIZE = 1000;
}