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/**
* Copyright 2010 The Apache Software Foundation
*
* 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.hbase;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.UUID;
import java.util.regex.Pattern;
import org.apache.hadoop.hbase.ipc.HRegionInterface;
import org.apache.hadoop.hbase.util.Bytes;
/**
* HConstants holds a bunch of HBase-related constants
*/
public final class HConstants {
/**
* Status codes used for return values of bulk operations.
*/
public enum OperationStatusCode {
NOT_RUN,
SUCCESS,
BAD_FAMILY,
SANITY_CHECK_FAILURE,
FAILURE;
}
/** long constant for zero */
public static final Long ZERO_L = Long.valueOf(0L);
public static final String NINES = "99999999999999";
public static final String ZEROES = "00000000000000";
// For migration
/** name of version file */
public static final String VERSION_FILE_NAME = "hbase.version";
/**
* Current version of file system.
* Version 4 supports only one kind of bloom filter.
* Version 5 changes versions in catalog table regions.
* Version 6 enables blockcaching on catalog tables.
* Version 7 introduces hfile -- hbase 0.19 to 0.20..
*/
// public static final String FILE_SYSTEM_VERSION = "6";
public static final String FILE_SYSTEM_VERSION = "7";
// Configuration parameters
//TODO: Is having HBase homed on port 60k OK?
/** Cluster is in distributed mode or not */
public static final String CLUSTER_DISTRIBUTED = "hbase.cluster.distributed";
/** Config for pluggable load balancers */
public static final String HBASE_MASTER_LOADBALANCER_CLASS = "hbase.master.loadbalancer.class";
/** Cluster is standalone or pseudo-distributed */
public static final boolean CLUSTER_IS_LOCAL = false;
/** Cluster is fully-distributed */
public static final boolean CLUSTER_IS_DISTRIBUTED = true;
/** Default value for cluster distributed mode */
public static final boolean DEFAULT_CLUSTER_DISTRIBUTED = CLUSTER_IS_LOCAL;
/** default host address */
public static final String DEFAULT_HOST = "0.0.0.0";
/** Parameter name for port master listens on. */
public static final String MASTER_PORT = "hbase.master.port";
/** default port that the master listens on */
public static final int DEFAULT_MASTER_PORT = 60000;
/** default port for master web api */
public static final int DEFAULT_MASTER_INFOPORT = 60010;
/** Parameter name for the master type being backup (waits for primary to go inactive). */
public static final String MASTER_TYPE_BACKUP = "hbase.master.backup";
/** by default every master is a possible primary master unless the conf explicitly overrides it */
public static final boolean DEFAULT_MASTER_TYPE_BACKUP = false;
/** Name of ZooKeeper quorum configuration parameter. */
public static final String ZOOKEEPER_QUORUM = "hbase.zookeeper.quorum";
/** Name of ZooKeeper config file in conf/ directory. */
public static final String ZOOKEEPER_CONFIG_NAME = "zoo.cfg";
/** Common prefix of ZooKeeper configuration properties */
public static final String ZK_CFG_PROPERTY_PREFIX =
"hbase.zookeeper.property.";
public static final int ZK_CFG_PROPERTY_PREFIX_LEN =
ZK_CFG_PROPERTY_PREFIX.length();
/**
* The ZK client port key in the ZK properties map. The name reflects the
* fact that this is not an HBase configuration key.
*/
public static final String CLIENT_PORT_STR = "clientPort";
/** Parameter name for the client port that the zookeeper listens on */
public static final String ZOOKEEPER_CLIENT_PORT =
ZK_CFG_PROPERTY_PREFIX + CLIENT_PORT_STR;
/** Default client port that the zookeeper listens on */
public static final int DEFAULT_ZOOKEPER_CLIENT_PORT = 2181;
/** Parameter name for the wait time for the recoverable zookeeper */
public static final String ZOOKEEPER_RECOVERABLE_WAITTIME = "hbase.zookeeper.recoverable.waittime";
/** Default wait time for the recoverable zookeeper */
public static final long DEFAULT_ZOOKEPER_RECOVERABLE_WAITIME = 10000;
/** Parameter name for the root dir in ZK for this cluster */
public static final String ZOOKEEPER_ZNODE_PARENT = "zookeeper.znode.parent";
public static final String DEFAULT_ZOOKEEPER_ZNODE_PARENT = "/hbase";
/**
* Parameter name for the limit on concurrent client-side zookeeper
* connections
*/
public static final String ZOOKEEPER_MAX_CLIENT_CNXNS =
ZK_CFG_PROPERTY_PREFIX + "maxClientCnxns";
/** Parameter name for the ZK data directory */
public static final String ZOOKEEPER_DATA_DIR =
ZK_CFG_PROPERTY_PREFIX + "dataDir";
/** Default limit on concurrent client-side zookeeper connections */
public static final int DEFAULT_ZOOKEPER_MAX_CLIENT_CNXNS = 300;
/** Configuration key for ZooKeeper session timeout */
public static final String ZK_SESSION_TIMEOUT = "zookeeper.session.timeout";
/** Default value for ZooKeeper session timeout */
public static final int DEFAULT_ZK_SESSION_TIMEOUT = 180 * 1000;
/** Parameter name for port region server listens on. */
public static final String REGIONSERVER_PORT = "hbase.regionserver.port";
/** Default port region server listens on. */
public static final int DEFAULT_REGIONSERVER_PORT = 60020;
/** default port for region server web api */
public static final int DEFAULT_REGIONSERVER_INFOPORT = 60030;
/** A flag that enables automatic selection of regionserver info port */
public static final String REGIONSERVER_INFO_PORT_AUTO =
"hbase.regionserver.info.port.auto";
/** Parameter name for what region server interface to use. */
public static final String REGION_SERVER_CLASS = "hbase.regionserver.class";
/** Parameter name for what region server implementation to use. */
public static final String REGION_SERVER_IMPL= "hbase.regionserver.impl";
/** Default region server interface class name. */
public static final String DEFAULT_REGION_SERVER_CLASS = HRegionInterface.class.getName();
/** Parameter name for what master implementation to use. */
public static final String MASTER_IMPL= "hbase.master.impl";
/** Parameter name for how often threads should wake up */
public static final String THREAD_WAKE_FREQUENCY = "hbase.server.thread.wakefrequency";
/** Default value for thread wake frequency */
public static final int DEFAULT_THREAD_WAKE_FREQUENCY = 10 * 1000;
/** Parameter name for how often we should try to write a version file, before failing */
public static final String VERSION_FILE_WRITE_ATTEMPTS = "hbase.server.versionfile.writeattempts";
/** Parameter name for how often we should try to write a version file, before failing */
public static final int DEFAULT_VERSION_FILE_WRITE_ATTEMPTS = 3;
/** Parameter name for how often a region should should perform a major compaction */
public static final String MAJOR_COMPACTION_PERIOD = "hbase.hregion.majorcompaction";
/** Parameter name for the maximum batch of KVs to be used in flushes and compactions */
public static final String COMPACTION_KV_MAX = "hbase.hstore.compaction.kv.max";
/** Parameter name for HBase instance root directory */
public static final String HBASE_DIR = "hbase.rootdir";
/** Parameter name for HBase client IPC pool type */
public static final String HBASE_CLIENT_IPC_POOL_TYPE = "hbase.client.ipc.pool.type";
/** Parameter name for HBase client IPC pool size */
public static final String HBASE_CLIENT_IPC_POOL_SIZE = "hbase.client.ipc.pool.size";
/** Parameter name for HBase client operation timeout, which overrides RPC timeout */
public static final String HBASE_CLIENT_OPERATION_TIMEOUT = "hbase.client.operation.timeout";
/** Default HBase client operation timeout, which is tantamount to a blocking call */
public static final int DEFAULT_HBASE_CLIENT_OPERATION_TIMEOUT = Integer.MAX_VALUE;
/** Used to construct the name of the log directory for a region server
* Use '.' as a special character to seperate the log files from table data */
public static final String HREGION_LOGDIR_NAME = ".logs";
/** Used to construct the name of the splitlog directory for a region server */
public static final String SPLIT_LOGDIR_NAME = "splitlog";
public static final String CORRUPT_DIR_NAME = ".corrupt";
/** Like the previous, but for old logs that are about to be deleted */
public static final String HREGION_OLDLOGDIR_NAME = ".oldlogs";
/** Used by HBCK to sideline backup data */
public static final String HBCK_SIDELINEDIR_NAME = ".hbck";
/** Used to construct the name of the compaction directory during compaction */
public static final String HREGION_COMPACTIONDIR_NAME = "compaction.dir";
/** Conf key for the max file size after which we split the region */
public static final String HREGION_MAX_FILESIZE =
"hbase.hregion.max.filesize";
/** Default maximum file size */
public static final long DEFAULT_MAX_FILE_SIZE = 10 * 1024 * 1024 * 1024L;
/**
* The max number of threads used for opening and closing stores or store
* files in parallel
*/
public static final String HSTORE_OPEN_AND_CLOSE_THREADS_MAX =
"hbase.hstore.open.and.close.threads.max";
/**
* The default number for the max number of threads used for opening and
* closing stores or store files in parallel
*/
public static final int DEFAULT_HSTORE_OPEN_AND_CLOSE_THREADS_MAX = 1;
/** Conf key for the memstore size at which we flush the memstore */
public static final String HREGION_MEMSTORE_FLUSH_SIZE =
"hbase.hregion.memstore.flush.size";
/** Default size of a reservation block */
public static final int DEFAULT_SIZE_RESERVATION_BLOCK = 1024 * 1024 * 5;
/** Maximum value length, enforced on KeyValue construction */
public static final int MAXIMUM_VALUE_LENGTH = Integer.MAX_VALUE;
/** name of the file for unique cluster ID */
public static final String CLUSTER_ID_FILE_NAME = "hbase.id";
/** Configuration key storing the cluster ID */
public static final String CLUSTER_ID = "hbase.cluster.id";
// Always store the location of the root table's HRegion.
// This HRegion is never split.
// region name = table + startkey + regionid. This is the row key.
// each row in the root and meta tables describes exactly 1 region
// Do we ever need to know all the information that we are storing?
// Note that the name of the root table starts with "-" and the name of the
// meta table starts with "." Why? it's a trick. It turns out that when we
// store region names in memory, we use a SortedMap. Since "-" sorts before
// "." (and since no other table name can start with either of these
// characters, the root region will always be the first entry in such a Map,
// followed by all the meta regions (which will be ordered by their starting
// row key as well), followed by all user tables. So when the Master is
// choosing regions to assign, it will always choose the root region first,
// followed by the meta regions, followed by user regions. Since the root
// and meta regions always need to be on-line, this ensures that they will
// be the first to be reassigned if the server(s) they are being served by
// should go down.
/** The root table's name.*/
public static final byte [] ROOT_TABLE_NAME = Bytes.toBytes("-ROOT-");
/** The META table's name. */
public static final byte [] META_TABLE_NAME = Bytes.toBytes(".META.");
/** delimiter used between portions of a region name */
public static final int META_ROW_DELIMITER = ',';
/** The catalog family as a string*/
public static final String CATALOG_FAMILY_STR = "info";
/** The catalog family */
public static final byte [] CATALOG_FAMILY = Bytes.toBytes(CATALOG_FAMILY_STR);
/** The regioninfo column qualifier */
public static final byte [] REGIONINFO_QUALIFIER = Bytes.toBytes("regioninfo");
/** The server column qualifier */
public static final byte [] SERVER_QUALIFIER = Bytes.toBytes("server");
/** The startcode column qualifier */
public static final byte [] STARTCODE_QUALIFIER = Bytes.toBytes("serverstartcode");
/** The lower-half split region column qualifier */
public static final byte [] SPLITA_QUALIFIER = Bytes.toBytes("splitA");
/** The upper-half split region column qualifier */
public static final byte [] SPLITB_QUALIFIER = Bytes.toBytes("splitB");
/**
* The meta table version column qualifier.
* We keep current version of the meta table in this column in -ROOT-
* table: i.e. in the 'info:v' column.
*/
public static final byte [] META_VERSION_QUALIFIER = Bytes.toBytes("v");
/**
* The current version of the meta table.
* Before this the meta had HTableDescriptor serialized into the HRegionInfo;
* i.e. pre-hbase 0.92. There was no META_VERSION column in the root table
* in this case. The presence of a version and its value being zero indicates
* meta is up-to-date.
*/
public static final short META_VERSION = 0;
// Other constants
/**
* An empty instance.
*/
public static final byte [] EMPTY_BYTE_ARRAY = new byte [0];
/**
* Used by scanners, etc when they want to start at the beginning of a region
*/
public static final byte [] EMPTY_START_ROW = EMPTY_BYTE_ARRAY;
/**
* Last row in a table.
*/
public static final byte [] EMPTY_END_ROW = EMPTY_START_ROW;
/**
* Used by scanners and others when they're trying to detect the end of a
* table
*/
public static final byte [] LAST_ROW = EMPTY_BYTE_ARRAY;
/**
* Max length a row can have because of the limitation in TFile.
*/
public static final int MAX_ROW_LENGTH = Short.MAX_VALUE;
/** When we encode strings, we always specify UTF8 encoding */
public static final String UTF8_ENCODING = "UTF-8";
/**
* Timestamp to use when we want to refer to the latest cell.
* This is the timestamp sent by clients when no timestamp is specified on
* commit.
*/
public static final long LATEST_TIMESTAMP = Long.MAX_VALUE;
/**
* Timestamp to use when we want to refer to the oldest cell.
*/
public static final long OLDEST_TIMESTAMP = Long.MIN_VALUE;
/**
* LATEST_TIMESTAMP in bytes form
*/
public static final byte [] LATEST_TIMESTAMP_BYTES = Bytes.toBytes(LATEST_TIMESTAMP);
/**
* Define for 'return-all-versions'.
*/
public static final int ALL_VERSIONS = Integer.MAX_VALUE;
/**
* Unlimited time-to-live.
*/
// public static final int FOREVER = -1;
public static final int FOREVER = Integer.MAX_VALUE;
/**
* Seconds in a week
*/
public static final int WEEK_IN_SECONDS = 7 * 24 * 3600;
//TODO: although the following are referenced widely to format strings for
// the shell. They really aren't a part of the public API. It would be
// nice if we could put them somewhere where they did not need to be
// public. They could have package visibility
public static final String NAME = "NAME";
public static final String VERSIONS = "VERSIONS";
public static final String IN_MEMORY = "IN_MEMORY";
/**
* This is a retry backoff multiplier table similar to the BSD TCP syn
* backoff table, a bit more aggressive than simple exponential backoff.
*/
public static int RETRY_BACKOFF[] = { 1, 1, 1, 2, 2, 4, 4, 8, 16, 32 };
public static final String REGION_IMPL = "hbase.hregion.impl";
/** modifyTable op for replacing the table descriptor */
public static enum Modify {
CLOSE_REGION,
TABLE_COMPACT,
TABLE_FLUSH,
TABLE_MAJOR_COMPACT,
TABLE_SET_HTD,
TABLE_SPLIT
}
/**
* Scope tag for locally scoped data.
* This data will not be replicated.
*/
public static final int REPLICATION_SCOPE_LOCAL = 0;
/**
* Scope tag for globally scoped data.
* This data will be replicated to all peers.
*/
public static final int REPLICATION_SCOPE_GLOBAL = 1;
/**
* Default cluster ID, cannot be used to identify a cluster so a key with
* this value means it wasn't meant for replication.
*/
public static final UUID DEFAULT_CLUSTER_ID = new UUID(0L,0L);
/**
* Parameter name for maximum number of bytes returned when calling a
* scanner's next method.
*/
public static String HBASE_CLIENT_SCANNER_MAX_RESULT_SIZE_KEY = "hbase.client.scanner.max.result.size";
/**
* Maximum number of bytes returned when calling a scanner's next method.
* Note that when a single row is larger than this limit the row is still
* returned completely.
*
* The default value is unlimited.
*/
public static long DEFAULT_HBASE_CLIENT_SCANNER_MAX_RESULT_SIZE = Long.MAX_VALUE;
/**
* Parameter name for client pause value, used mostly as value to wait
* before running a retry of a failed get, region lookup, etc.
*/
public static String HBASE_CLIENT_PAUSE = "hbase.client.pause";
/**
* Default value of {@link #HBASE_CLIENT_PAUSE}.
*/
public static long DEFAULT_HBASE_CLIENT_PAUSE = 1000;
/**
* Parameter name for maximum retries, used as maximum for all retryable
* operations such as fetching of the root region from root region server,
* getting a cell's value, starting a row update, etc.
*/
public static String HBASE_CLIENT_RETRIES_NUMBER = "hbase.client.retries.number";
/**
* Default value of {@link #HBASE_CLIENT_RETRIES_NUMBER}.
*/
public static int DEFAULT_HBASE_CLIENT_RETRIES_NUMBER = 10;
/**
* Parameter name for maximum attempts, used to limit the number of times the
* client will try to obtain the proxy for a given region server.
*/
public static String HBASE_CLIENT_RPC_MAXATTEMPTS = "hbase.client.rpc.maxattempts";
/**
* Default value of {@link #HBASE_CLIENT_RPC_MAXATTEMPTS}.
*/
public static int DEFAULT_HBASE_CLIENT_RPC_MAXATTEMPTS = 1;
/**
* Parameter name for client prefetch limit, used as the maximum number of regions
* info that will be prefetched.
*/
public static String HBASE_CLIENT_PREFETCH_LIMIT = "hbase.client.prefetch.limit";
/**
* Default value of {@link #HBASE_CLIENT_PREFETCH_LIMIT}.
*/
public static int DEFAULT_HBASE_CLIENT_PREFETCH_LIMIT = 10;
/**
* Parameter name for number of rows that will be fetched when calling next on
* a scanner if it is not served from memory. Higher caching values will
* enable faster scanners but will eat up more memory and some calls of next
* may take longer and longer times when the cache is empty.
*/
public static String HBASE_META_SCANNER_CACHING = "hbase.meta.scanner.caching";
/**
* Default value of {@link #HBASE_META_SCANNER_CACHING}.
*/
public static int DEFAULT_HBASE_META_SCANNER_CACHING = 100;
/**
* Parameter name for unique identifier for this {@link org.apache.hadoop.conf.Configuration}
* instance. If there are two or more {@link org.apache.hadoop.conf.Configuration} instances that,
* for all intents and purposes, are the same except for their instance ids,
* then they will not be able to share the same {@link org.apache.hadoop.hbase.client.HConnection} instance.
* On the other hand, even if the instance ids are the same, it could result
* in non-shared {@link org.apache.hadoop.hbase.client.HConnection}
* instances if some of the other connection parameters differ.
*/
public static String HBASE_CLIENT_INSTANCE_ID = "hbase.client.instance.id";
/**
* HRegion server lease period in milliseconds. Clients must report in within this period
* else they are considered dead. Unit measured in ms (milliseconds).
*/
public static String HBASE_REGIONSERVER_LEASE_PERIOD_KEY =
"hbase.regionserver.lease.period";
/**
* Default value of {@link #HBASE_REGIONSERVER_LEASE_PERIOD_KEY}.
*/
public static long DEFAULT_HBASE_REGIONSERVER_LEASE_PERIOD = 60000;
/**
* timeout for each RPC
*/
public static String HBASE_RPC_TIMEOUT_KEY = "hbase.rpc.timeout";
/**
* Default value of {@link #HBASE_RPC_TIMEOUT_KEY}
*/
public static int DEFAULT_HBASE_RPC_TIMEOUT = 60000;
/*
* cluster replication constants.
*/
public static final String
REPLICATION_ENABLE_KEY = "hbase.replication";
public static final String
REPLICATION_SOURCE_SERVICE_CLASSNAME = "hbase.replication.source.service";
public static final String
REPLICATION_SINK_SERVICE_CLASSNAME = "hbase.replication.sink.service";
public static final String REPLICATION_SERVICE_CLASSNAME_DEFAULT =
"org.apache.hadoop.hbase.replication.regionserver.Replication";
/** HBCK special code name used as server name when manipulating ZK nodes */
public static final String HBCK_CODE_NAME = "HBCKServerName";
public static final ServerName HBCK_CODE_SERVERNAME =
new ServerName(HBCK_CODE_NAME, -1, -1L);
public static final String KEY_FOR_HOSTNAME_SEEN_BY_MASTER =
"hbase.regionserver.hostname.seen.by.master";
public static final String HBASE_MASTER_LOGCLEANER_PLUGINS =
"hbase.master.logcleaner.plugins";
public static final String HBASE_REGION_SPLIT_POLICY_KEY =
"hbase.regionserver.region.split.policy";
/**
* Configuration key for the size of the block cache
*/
public static final String HFILE_BLOCK_CACHE_SIZE_KEY =
"hfile.block.cache.size";
public static final float HFILE_BLOCK_CACHE_SIZE_DEFAULT = 0.25f;
/*
* Minimum percentage of free heap necessary for a successful cluster startup.
*/
public static final float HBASE_CLUSTER_MINIMUM_MEMORY_THRESHOLD = 0.2f;
public static final List HBASE_NON_USER_TABLE_DIRS = new ArrayList(
Arrays.asList(new String[]{ HREGION_LOGDIR_NAME, HREGION_OLDLOGDIR_NAME,
CORRUPT_DIR_NAME, Bytes.toString(META_TABLE_NAME),
Bytes.toString(ROOT_TABLE_NAME), SPLIT_LOGDIR_NAME,
HBCK_SIDELINEDIR_NAME }));
public static final Pattern CP_HTD_ATTR_KEY_PATTERN = Pattern.compile
("^coprocessor\\$([0-9]+)$", Pattern.CASE_INSENSITIVE);
public static final Pattern CP_HTD_ATTR_VALUE_PATTERN =
Pattern.compile("(^[^\\|]*)\\|([^\\|]+)\\|[\\s]*([\\d]*)[\\s]*(\\|.*)?$");
public static final String CP_HTD_ATTR_VALUE_PARAM_KEY_PATTERN = "[^=,]+";
public static final String CP_HTD_ATTR_VALUE_PARAM_VALUE_PATTERN = "[^,]+";
public static final Pattern CP_HTD_ATTR_VALUE_PARAM_PATTERN = Pattern.compile(
"(" + CP_HTD_ATTR_VALUE_PARAM_KEY_PATTERN + ")=(" +
CP_HTD_ATTR_VALUE_PARAM_VALUE_PATTERN + "),?");
/** The delay when re-trying a socket operation in a loop (HBASE-4712) */
public static final int SOCKET_RETRY_WAIT_MS = 200;
/** Host name of the local machine */
public static final String LOCALHOST = "localhost";
/** Enable file permission modification from standard hbase */
public static final String ENABLE_DATA_FILE_UMASK = "hbase.data.umask.enable";
/** File permission umask to use when creating hbase data files */
public static final String DATA_FILE_UMASK_KEY = "hbase.data.umask";
/**
* If this parameter is set to true, then hbase will read
* data and then verify checksums. Checksum verification
* inside hdfs will be switched off. However, if the hbase-checksum
* verification fails, then it will switch back to using
* hdfs checksums for verifiying data that is being read from storage.
*
* If this parameter is set to false, then hbase will not
* verify any checksums, instead it will depend on checksum verification
* being done in the hdfs client.
*/
public static final String HBASE_CHECKSUM_VERIFICATION =
"hbase.regionserver.checksum.verify";
/**
* The name of the configuration parameter that specifies
* the number of bytes in a newly created checksum chunk.
*/
public static final String BYTES_PER_CHECKSUM =
"hbase.hstore.bytes.per.checksum";
/**
* The name of the configuration parameter that specifies
* the name of an algorithm that is used to compute checksums
* for newly created blocks.
*/
public static final String CHECKSUM_TYPE_NAME =
"hbase.hstore.checksum.algorithm";
/** Configuration name of HLog Compression */
public static final String ENABLE_WAL_COMPRESSION =
"hbase.regionserver.wal.enablecompression";
/**
* QOS attributes: these attributes are used to demarcate RPC call processing
* by different set of handlers. For example, HIGH_QOS tagged methods are
* handled by high priority handlers.
*/
public static final int NORMAL_QOS = 0;
public static final int QOS_THRESHOLD = 10;
public static final int HIGH_QOS = 100;
public static final int REPLICATION_QOS = 5; // normal_QOS < replication_QOS < high_QOS
private HConstants() {
// Can't be instantiated with this ctor.
}
}
