一、配置说明
import org.apache.hadoop.hbase.HConstants
二、源代码信息如下
/**
* 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 static org.apache.hadoop.hbase.io.hfile.BlockType.MAGIC_LENGTH;
import java.nio.charset.Charset;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.UUID;
import java.util.regex.Pattern;
import org.apache.commons.lang.ArrayUtils;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.classification.InterfaceStability;
import org.apache.hadoop.hbase.util.Bytes;
/**
* HConstants holds a bunch of HBase-related constants
*/
@InterfaceAudience.Public
@InterfaceStability.Stable
public final class HConstants {
// NOTICE!!!! Please do not add a constants here, unless they are referenced by a lot of classes.
//Bytes.UTF8_ENCODING should be updated if this changed
/** When we encode strings, we always specify UTF8 encoding */
public static final String UTF8_ENCODING = "UTF-8";
//Bytes.UTF8_CHARSET should be updated if this changed
/** When we encode strings, we always specify UTF8 encoding */
public static final Charset UTF8_CHARSET = Charset.forName(UTF8_ENCODING);
/**
* Default block size for an HFile.
*/
public final static int DEFAULT_BLOCKSIZE = 64 * 1024;
/** Used as a magic return value while optimized index key feature enabled(HBASE-7845) */
public final static int INDEX_KEY_MAGIC = -2;
/*
* Name of directory that holds recovered edits written by the wal log
* splitting code, one per region
*/
public static final String RECOVERED_EDITS_DIR = "recovered.edits";
/**
* The first four bytes of Hadoop RPC connections
*/
public static final byte[] RPC_HEADER = new byte[] { 'H', 'B', 'a', 's' };
public static final byte RPC_CURRENT_VERSION = 0;
// HFileBlock constants.
/** The size data structures with minor version is 0 */
public static final int HFILEBLOCK_HEADER_SIZE_NO_CHECKSUM = MAGIC_LENGTH + 2 * Bytes.SIZEOF_INT
+ Bytes.SIZEOF_LONG;
/** The size of a version 2 HFile block header, minor version 1.
* There is a 1 byte checksum type, followed by a 4 byte bytesPerChecksum
* followed by another 4 byte value to store sizeofDataOnDisk.
*/
public static final int HFILEBLOCK_HEADER_SIZE = HFILEBLOCK_HEADER_SIZE_NO_CHECKSUM +
Bytes.SIZEOF_BYTE + 2 * Bytes.SIZEOF_INT;
/** Just an array of bytes of the right size. */
public static final byte[] HFILEBLOCK_DUMMY_HEADER = new byte[HFILEBLOCK_HEADER_SIZE];
//End HFileBlockConstants.
/**
* Status codes used for return values of bulk operations.
*/
@InterfaceAudience.Private
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..
* Version 8 introduces namespace
*/
// public static final String FILE_SYSTEM_VERSION = "6";
public static final String FILE_SYSTEM_VERSION = "8";
// 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";
/** Config for pluggable region normalizer */
public static final String HBASE_MASTER_NORMALIZER_CLASS =
"hbase.master.normalizer.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;
/** Configuration key for master web API port */
public static final String MASTER_INFO_PORT = "hbase.master.info.port";
/** 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";
/** Parameter name for the ZK tick time */
public static final String ZOOKEEPER_TICK_TIME =
ZK_CFG_PROPERTY_PREFIX + "tickTime";
/** 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;
/** Configuration key for whether to use ZK.multi */
public static final String ZOOKEEPER_USEMULTI = "hbase.zookeeper.useMulti";
/** 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 configuration key for regionserver info port */
public static final String REGIONSERVER_INFO_PORT =
"hbase.regionserver.info.port";
/** A flag that enables automatic selection of regionserver info port */
public static final String REGIONSERVER_INFO_PORT_AUTO =
REGIONSERVER_INFO_PORT + ".auto";
/** Parameter name for what region server implementation to use. */
public static final String REGION_SERVER_IMPL= "hbase.regionserver.impl";
/** Parameter name for what master implementation to use. */
public static final String MASTER_IMPL= "hbase.master.impl";
/** Parameter name for what hbase client implementation to use. */
public static final String HBASECLIENT_IMPL= "hbase.hbaseclient.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";
public static final int COMPACTION_KV_MAX_DEFAULT = 10;
/** 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";
/** Parameter name for HBase client operation timeout, which overrides RPC timeout */
public static final String HBASE_CLIENT_META_OPERATION_TIMEOUT =
"hbase.client.meta.operation.timeout";
/** Default HBase client operation timeout, which is tantamount to a blocking call */
public static final int DEFAULT_HBASE_CLIENT_OPERATION_TIMEOUT = 1200000;
/** Used to construct the name of the log directory for a region server */
public static final String HREGION_LOGDIR_NAME = "WALs";
/** Used to construct the name of the splitlog directory for a region server */
public static final String SPLIT_LOGDIR_NAME = "splitWAL";
/** Like the previous, but for old logs that are about to be deleted */
public static final String HREGION_OLDLOGDIR_NAME = "oldWALs";
public static final String CORRUPT_DIR_NAME = "corrupt";
/** Used by HBCK to sideline backup data */
public static final String HBCK_SIDELINEDIR_NAME = ".hbck";
/** Any artifacts left from migration can be moved here */
public static final String MIGRATION_NAME = ".migration";
/**
* The directory from which co-processor/custom filter jars can be loaded
* dynamically by the region servers. This value can be overridden by the
* hbase.dynamic.jars.dir config.
*/
public static final String LIB_DIR = "lib";
/** 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;
/**
* Max size of single row for Get's or Scan's without in-row scanning flag set.
*/
public static final String TABLE_MAX_ROWSIZE_KEY = "hbase.table.max.rowsize";
/**
* Default max row size (1 Gb).
*/
public static final long TABLE_MAX_ROWSIZE_DEFAULT = 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;
/**
* Block updates if memstore has hbase.hregion.memstore.block.multiplier
* times hbase.hregion.memstore.flush.size bytes. Useful preventing
* runaway memstore during spikes in update traffic.
*/
public static final String HREGION_MEMSTORE_BLOCK_MULTIPLIER =
"hbase.hregion.memstore.block.multiplier";
/**
* Default value for hbase.hregion.memstore.block.multiplier
*/
public static final int DEFAULT_HREGION_MEMSTORE_BLOCK_MULTIPLIER = 4;
/** 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";
public static final String HREGION_EDITS_REPLAY_SKIP_ERRORS =
"hbase.hregion.edits.replay.skip.errors";
public static final boolean DEFAULT_HREGION_EDITS_REPLAY_SKIP_ERRORS =
false;
/** Maximum value length, enforced on KeyValue construction */
public static final int MAXIMUM_VALUE_LENGTH = Integer.MAX_VALUE - 1;
/** name of the file for unique cluster ID */
public static final String CLUSTER_ID_FILE_NAME = "hbase.id";
/** Default value for cluster ID */
public static final String CLUSTER_ID_DEFAULT = "default-cluster";
/** Parameter name for # days to keep MVCC values during a major compaction */
public static final String KEEP_SEQID_PERIOD = "hbase.hstore.compaction.keep.seqId.period";
/** At least to keep MVCC values in hfiles for 5 days */
public static final int MIN_KEEP_SEQID_PERIOD = 5;
// 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 hbase:meta table's name.
* @deprecated For upgrades of 0.94 to 0.96
*/
@Deprecated // for compat from 0.94 -> 0.96.
public static final byte[] META_TABLE_NAME = TableName.META_TABLE_NAME.getName();
public static final String BASE_NAMESPACE_DIR = "data";
/** 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 qualifier as a string */
public static final String REGIONINFO_QUALIFIER_STR = "regioninfo";
/** The regioninfo column qualifier */
public static final byte [] REGIONINFO_QUALIFIER = Bytes.toBytes(REGIONINFO_QUALIFIER_STR);
/** The server column qualifier */
public static final String SERVER_QUALIFIER_STR = "server";
/** The server column qualifier */
public static final byte [] SERVER_QUALIFIER = Bytes.toBytes(SERVER_QUALIFIER_STR);
/** The startcode column qualifier */
public static final String STARTCODE_QUALIFIER_STR = "serverstartcode";
/** The startcode column qualifier */
public static final byte [] STARTCODE_QUALIFIER = Bytes.toBytes(STARTCODE_QUALIFIER_STR);
/** The open seqnum column qualifier */
public static final String SEQNUM_QUALIFIER_STR = "seqnumDuringOpen";
/** The open seqnum column qualifier */
public static final byte [] SEQNUM_QUALIFIER = Bytes.toBytes(SEQNUM_QUALIFIER_STR);
/** The state column qualifier */
public static final String STATE_QUALIFIER_STR = "state";
public static final byte [] STATE_QUALIFIER = Bytes.toBytes(STATE_QUALIFIER_STR);
/**
* The serverName column qualifier. Its the server where the region is
* transitioning on, while column server is the server where the region is
* opened on. They are the same when the region is in state OPEN.
*/
public static final String SERVERNAME_QUALIFIER_STR = "sn";
public static final byte [] SERVERNAME_QUALIFIER = Bytes.toBytes(SERVERNAME_QUALIFIER_STR);
/** 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 lower-half merge region column qualifier */
public static final byte[] MERGEA_QUALIFIER = Bytes.toBytes("mergeA");
/** The upper-half merge region column qualifier */
public static final byte[] MERGEB_QUALIFIER = Bytes.toBytes("mergeB");
/**
* 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.
* - pre-hbase 0.92. There is no META_VERSION column in the root table
* in this case. The meta has HTableDescriptor serialized into the HRegionInfo;
* - version 0 is 0.92 and 0.94. Meta data has serialized HRegionInfo's using
* Writable serialization, and HRegionInfo's does not contain HTableDescriptors.
* - version 1 for 0.96+ keeps HRegionInfo data structures, but changes the
* byte[] serialization from Writables to Protobuf.
* See HRegionInfo.VERSION
*/
public static final short META_VERSION = 1;
// 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;
/**
* 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 = {
// big-endian
(byte) (LATEST_TIMESTAMP >>> 56),
(byte) (LATEST_TIMESTAMP >>> 48),
(byte) (LATEST_TIMESTAMP >>> 40),
(byte) (LATEST_TIMESTAMP >>> 32),
(byte) (LATEST_TIMESTAMP >>> 24),
(byte) (LATEST_TIMESTAMP >>> 16),
(byte) (LATEST_TIMESTAMP >>> 8),
(byte) 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;
/**
* Seconds in a day, hour and minute
*/
public static final int DAY_IN_SECONDS = 24 * 60 * 60;
public static final int HOUR_IN_SECONDS = 60 * 60;
public static final int MINUTE_IN_SECONDS = 60;
//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";
public static final String METADATA = "METADATA";
public static final String CONFIGURATION = "CONFIGURATION";
/**
* Retrying we multiply hbase.client.pause setting by what we have in this array until we
* run out of array items. Retries beyond this use the last number in the array. So, for
* example, if hbase.client.pause is 1 second, and maximum retries count
* hbase.client.retries.number is 10, we will retry at the following intervals:
* 1, 2, 3, 5, 10, 20, 40, 100, 100, 100.
* With 100ms, a back-off of 200 means 20s
*/
public static final int [] RETRY_BACKOFF = {1, 2, 3, 5, 10, 20, 40, 100, 100, 100, 100, 200, 200};
public static final String REGION_IMPL = "hbase.hregion.impl";
/** modifyTable op for replacing the table descriptor */
@InterfaceAudience.Private
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.
* Controlled by the client.
*/
public static final String HBASE_CLIENT_SCANNER_MAX_RESULT_SIZE_KEY =
"hbase.client.scanner.max.result.size";
/**
* Parameter name for maximum number of bytes returned when calling a scanner's next method.
* Controlled by the server.
*/
public static final String HBASE_SERVER_SCANNER_MAX_RESULT_SIZE_KEY =
"hbase.server.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 2MB.
*/
public static final long DEFAULT_HBASE_CLIENT_SCANNER_MAX_RESULT_SIZE = 2 * 1024 * 1024;
/**
* 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.
* Safety setting to protect the region server.
*
* The default value is 100MB. (a client would rarely request larger chunks on purpose)
*/
public static final long DEFAULT_HBASE_SERVER_SCANNER_MAX_RESULT_SIZE = 100 * 1024 * 1024;
/**
* 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 final String HBASE_CLIENT_PAUSE = "hbase.client.pause";
/**
* Default value of {@link #HBASE_CLIENT_PAUSE}.
*/
public static final long DEFAULT_HBASE_CLIENT_PAUSE = 100;
/**
* The maximum number of concurrent connections the client will maintain.
*/
public static final String HBASE_CLIENT_MAX_TOTAL_TASKS = "hbase.client.max.total.tasks";
/**
* Default value of {@link #HBASE_CLIENT_MAX_TOTAL_TASKS}.
*/
public static final int DEFAULT_HBASE_CLIENT_MAX_TOTAL_TASKS = 100;
/**
* The maximum number of concurrent connections the client will maintain to a single
* RegionServer.
*/
public static final String HBASE_CLIENT_MAX_PERSERVER_TASKS = "hbase.client.max.perserver.tasks";
/**
* Default value of {@link #HBASE_CLIENT_MAX_PERSERVER_TASKS}.
*/
public static final int DEFAULT_HBASE_CLIENT_MAX_PERSERVER_TASKS = 2;
/**
* The maximum number of concurrent connections the client will maintain to a single
* Region.
*/
public static final String HBASE_CLIENT_MAX_PERREGION_TASKS = "hbase.client.max.perregion.tasks";
/**
* Default value of {@link #HBASE_CLIENT_MAX_PERREGION_TASKS}.
*/
public static final int DEFAULT_HBASE_CLIENT_MAX_PERREGION_TASKS = 1;
/**
* Parameter name for server pause value, used mostly as value to wait before
* running a retry of a failed operation.
*/
public static final String HBASE_SERVER_PAUSE = "hbase.server.pause";
/**
* Default value of {@link #HBASE_SERVER_PAUSE}.
*/
public static final int DEFAULT_HBASE_SERVER_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 final String HBASE_CLIENT_RETRIES_NUMBER = "hbase.client.retries.number";
/**
* Default value of {@link #HBASE_CLIENT_RETRIES_NUMBER}.
*/
public static final int DEFAULT_HBASE_CLIENT_RETRIES_NUMBER = 31;
/**
* Parameter name for client region location prefetch toggle.
*/
public static String HBASE_CLIENT_PREFETCH = "hbase.client.prefetch";
/**
* Default value of {@link #HBASE_CLIENT_PREFETCH}.
*/
public static boolean DEFAULT_HBASE_CLIENT_PREFETCH = true;
/**
* 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 to set the default scanner caching for all clients.
*/
public static final String HBASE_CLIENT_SCANNER_CACHING = "hbase.client.scanner.caching";
/**
* Default value for {@link #HBASE_CLIENT_SCANNER_CACHING}
*/
public static final int DEFAULT_HBASE_CLIENT_SCANNER_CACHING = Integer.MAX_VALUE;
/**
* Parameter name for number of versions, kept by meta table.
*/
public static String HBASE_META_VERSIONS = "hbase.meta.versions";
/**
* Default value of {@link #HBASE_META_VERSIONS}.
*/
public static int DEFAULT_HBASE_META_VERSIONS = 10;
/**
* Parameter name for number of versions, kept by meta table.
*/
public static String HBASE_META_BLOCK_SIZE = "hbase.meta.blocksize";
/**
* Default value of {@link #HBASE_META_BLOCK_SIZE}.
*/
public static int DEFAULT_HBASE_META_BLOCK_SIZE = 8 * 1024;
/**
* 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 final String HBASE_META_SCANNER_CACHING = "hbase.meta.scanner.caching";
/**
* Default value of {@link #HBASE_META_SCANNER_CACHING}.
*/
public static final 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 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
* org.apache.hadoop.hbase.client.HConnection instances if some of the other connection parameters
* differ.
*/
public static final String HBASE_CLIENT_INSTANCE_ID = "hbase.client.instance.id";
/**
* The client scanner timeout period in milliseconds.
*/
public static final String HBASE_CLIENT_SCANNER_TIMEOUT_PERIOD = "hbase.client.scanner.timeout.period";
/**
* Use {@link #HBASE_CLIENT_SCANNER_TIMEOUT_PERIOD} instead.
* @deprecated This config option is deprecated. Will be removed at later releases after 0.96.
*/
@Deprecated
public static final String HBASE_REGIONSERVER_LEASE_PERIOD_KEY =
"hbase.regionserver.lease.period";
/**
* Default value of {@link #HBASE_CLIENT_SCANNER_TIMEOUT_PERIOD}.
*/
public static final int DEFAULT_HBASE_CLIENT_SCANNER_TIMEOUT_PERIOD = 60000;
/**
* timeout for each RPC
*/
public static final String HBASE_RPC_TIMEOUT_KEY = "hbase.rpc.timeout";
/**
* Default value of {@link #HBASE_RPC_TIMEOUT_KEY}
*/
public static final int DEFAULT_HBASE_RPC_TIMEOUT = 60000;
/**
* timeout for short operation RPC
*/
public static final String HBASE_RPC_SHORTOPERATION_TIMEOUT_KEY =
"hbase.rpc.shortoperation.timeout";
/**
* Default value of {@link #HBASE_RPC_SHORTOPERATION_TIMEOUT_KEY}
*/
public static final int DEFAULT_HBASE_RPC_SHORTOPERATION_TIMEOUT = 10000;
/**
* Value indicating the server name was saved with no sequence number.
*/
public static final long NO_SEQNUM = -1;
/*
* cluster replication constants.
*/
public static final String
REPLICATION_ENABLE_KEY = "hbase.replication";
public static final boolean
REPLICATION_ENABLE_DEFAULT = true;
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 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";
/** Whether nonces are enabled; default is true. */
public static final String HBASE_RS_NONCES_ENABLED = "hbase.regionserver.nonces.enabled";
/**
* 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 = 0.4f;
/*
* 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 Pattern CP_HTD_ATTR_KEY_PATTERN =
Pattern.compile("^coprocessor\\$([0-9]+)$", Pattern.CASE_INSENSITIVE);
/**
* Pattern that matches a coprocessor specification. Form is:
*
*<coprocessor jar file location> '|' < ['|' <priority> ['|' <arguments>]]
*
* ...where arguments are
<KEY> '=' <VALUE> [,...]
*
三、里面包含所有的hbase配置说明！这又有什么用呢？举例如下
获取hbase链接时，不使用默认的znode目录"/hbase"：
//常规方式获取链接
def getHbaseConn( ipStr:String) :HBaseAdmin= {
//获取配置
val conf: Configuration =HBaseConfiguration.create()
//配置说明：package org.apache.hadoop.hbase.HConstants
conf.set("hbase.zookeeper.quorum",ipStr)
conf.set("zookeeper.znode.parent","/hbase02") //不使用默认的目录"/hbase"
//获取Hbase的master
val admin=new HBaseAdmin(conf)
admin
}
