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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
*
* 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.client;
import java.util.Arrays;
import java.util.Collection;
import java.util.Comparator;
import java.util.Iterator;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.yetus.audience.InterfaceAudience;
/**
* TableDescriptor contains the details about an HBase table such as the descriptors of all the
* column families, is the table a catalog table, hbase:meta , if the table is read
* only, the maximum size of the memstore, when the region split should occur, coprocessors
* associated with it etc...
*/
@InterfaceAudience.Public
public interface TableDescriptor {
@InterfaceAudience.Private
Comparator COMPARATOR = getComparator(ColumnFamilyDescriptor.COMPARATOR);
@InterfaceAudience.Private
Comparator COMPARATOR_IGNORE_REPLICATION =
getComparator(ColumnFamilyDescriptor.COMPARATOR_IGNORE_REPLICATION);
static Comparator
getComparator(Comparator cfComparator) {
return (TableDescriptor lhs, TableDescriptor rhs) -> {
int result = lhs.getTableName().compareTo(rhs.getTableName());
if (result != 0) {
return result;
}
Collection lhsFamilies = Arrays.asList(lhs.getColumnFamilies());
Collection rhsFamilies = Arrays.asList(rhs.getColumnFamilies());
result = Integer.compare(lhsFamilies.size(), rhsFamilies.size());
if (result != 0) {
return result;
}
for (Iterator it = lhsFamilies.iterator(),
it2 = rhsFamilies.iterator(); it.hasNext();) {
result = cfComparator.compare(it.next(), it2.next());
if (result != 0) {
return result;
}
}
// punt on comparison for ordering, just calculate difference
return Integer.compare(lhs.getValues().hashCode(), rhs.getValues().hashCode());
};
}
/**
* Returns the count of the column families of the table.
* @return Count of column families of the table
*/
int getColumnFamilyCount();
/**
* Return the list of attached co-processor represented
* @return The list of CoprocessorDescriptor
*/
Collection getCoprocessorDescriptors();
/**
* Return the list of attached co-processor represented by their name className
* @return The list of co-processors classNames
* @deprecated As of release 2.0.0, this will be removed in HBase 3.0.0. Use
* {@link #getCoprocessorDescriptors()} instead
*/
@Deprecated
default Collection getCoprocessors() {
return getCoprocessorDescriptors().stream().map(CoprocessorDescriptor::getClassName)
.collect(Collectors.toList());
}
/**
* Returns the durability setting for the table.
* @return durability setting for the table.
*/
Durability getDurability();
/**
* Returns an unmodifiable collection of all the {@link ColumnFamilyDescriptor} of all the column
* families of the table.
* @return An array of {@link ColumnFamilyDescriptor} of all the column families.
*/
ColumnFamilyDescriptor[] getColumnFamilies();
/**
* Returns all the column family names of the current table. The map of TableDescriptor contains
* mapping of family name to ColumnDescriptor. This returns all the keys of the family map which
* represents the column family names of the table.
* @return Immutable sorted set of the keys of the families.
*/
Set getColumnFamilyNames();
/**
* Returns the ColumnDescriptor for a specific column family with name as specified by the
* parameter column.
* @param name Column family name
* @return Column descriptor for the passed family name or the family on passed in column.
*/
ColumnFamilyDescriptor getColumnFamily(final byte[] name);
/**
* This gets the class associated with the flush policy which determines the stores need to be
* flushed when flushing a region. The class used by default is defined in
* org.apache.hadoop.hbase.regionserver.FlushPolicy.
* @return the class name of the flush policy for this table. If this returns null, the default
* flush policy is used.
*/
String getFlushPolicyClassName();
/**
* Returns the maximum size upto which a region can grow to after which a region split is
* triggered. The region size is represented by the size of the biggest store file in that region.
* @return max hregion size for table, -1 if not set.
*/
long getMaxFileSize();
/**
* Returns the size of the memstore after which a flush to filesystem is triggered.
* @return memory cache flush size for each hregion, -1 if not set.
*/
long getMemStoreFlushSize();
// TODO: Currently this is used RPC scheduling only. Make it more generic than this; allow it
// to also be priority when scheduling procedures that pertain to this table scheduling first
// those tables with the highest priority (From Yi Liang over on HBASE-18109).
int getPriority();
/** Returns Returns the configured replicas per region */
int getRegionReplication();
/**
* This gets the class associated with the region split policy which determines when a region
* split should occur. The class used by default is defined in
* org.apache.hadoop.hbase.regionserver.RegionSplitPolicy
* @return the class name of the region split policy for this table. If this returns null, the
* default split policy is used.
*/
String getRegionSplitPolicyClassName();
/**
* Get the name of the table
*/
TableName getTableName();
/**
* Get the owner name as a string.
* @deprecated since 2.0.0 and will be removed in 3.0.0.
* @see HBASE-15583
*/
@Deprecated
String getOwnerString();
/**
* Getter for accessing the metadata associated with the key.
* @param key The key.
* @return A clone value. Null if no mapping for the key
*/
Bytes getValue(Bytes key);
/**
* Getter for accessing the metadata associated with the key.
* @param key The key.
* @return A clone value. Null if no mapping for the key
*/
byte[] getValue(byte[] key);
/**
* Getter for accessing the metadata associated with the key.
* @param key The key.
* @return Null if no mapping for the key
*/
String getValue(String key);
/** Returns Getter for fetching an unmodifiable map. */
Map getValues();
/**
* Check if the table has an attached co-processor represented by the name className
* @param classNameToMatch - Class name of the co-processor
* @return true of the table has a co-processor className
*/
boolean hasCoprocessor(String classNameToMatch);
/**
* Checks to see if this table contains the given column family
* @param name Family name or column name.
* @return true if the table contains the specified family name
*/
boolean hasColumnFamily(final byte[] name);
/** Returns true if the read-replicas memstore replication is enabled. */
boolean hasRegionMemStoreReplication();
/**
* Check if the compaction enable flag of the table is true. If flag is false then no minor/major
* compactions will be done in real.
* @return true if table compaction enabled
*/
boolean isCompactionEnabled();
/**
* Check if the split enable flag of the table is true. If flag is false then no region split will
* be done.
* @return true if table region split enabled
*/
boolean isSplitEnabled();
/**
* Check if the merge enable flag of the table is true. If flag is false then no region merge will
* be done.
* @return true if table region merge enabled
*/
boolean isMergeEnabled();
/**
* Checks if this table is hbase:meta region.
* @return true if this table is hbase:meta region
*/
boolean isMetaRegion();
/**
* Checks if the table is a hbase:meta table
* @return true if table is hbase:meta region.
*/
boolean isMetaTable();
/**
* Check if normalization enable flag of the table is true. If flag is false then region
* normalizer won't attempt to normalize this table.
* @return true if region normalization is enabled for this table
*/
boolean isNormalizationEnabled();
/**
* Check if there is the target region count. If so, the normalize plan will be calculated based
* on the target region count.
* @return target region count after normalize done
*/
int getNormalizerTargetRegionCount();
/**
* Check if there is the target region size. If so, the normalize plan will be calculated based on
* the target region size.
* @return target region size after normalize done
*/
long getNormalizerTargetRegionSize();
/**
* Check if the readOnly flag of the table is set. If the readOnly flag is set then the contents
* of the table can only be read from but not modified.
* @return true if all columns in the table should be read only
*/
boolean isReadOnly();
/**
* The HDFS erasure coding policy for a table. This will be set on the data dir of the table, and
* is an alternative to normal replication which takes less space at the cost of locality.
* @return the current policy, or null if undefined
*/
default String getErasureCodingPolicy() {
return null;
}
/**
* Returns Name of this table and then a map of all of the column family descriptors (with only
* the non-default column family attributes)
*/
String toStringCustomizedValues();
/**
* Check if any of the table's cfs' replication scope are set to
* {@link HConstants#REPLICATION_SCOPE_GLOBAL}.
* @return {@code true} if we have, otherwise {@code false}.
*/
default boolean hasGlobalReplicationScope() {
return Stream.of(getColumnFamilies())
.anyMatch(cf -> cf.getScope() == HConstants.REPLICATION_SCOPE_GLOBAL);
}
/**
* Check if the table's cfs' replication scope matched with the replication state
* @param enabled replication state
* @return true if matched, otherwise false
*/
default boolean matchReplicationScope(boolean enabled) {
boolean hasEnabled = false;
boolean hasDisabled = false;
for (ColumnFamilyDescriptor cf : getColumnFamilies()) {
if (cf.getScope() != HConstants.REPLICATION_SCOPE_GLOBAL) {
hasDisabled = true;
} else {
hasEnabled = true;
}
}
if (hasEnabled && hasDisabled) {
return false;
}
if (hasEnabled) {
return enabled;
}
return !enabled;
}
/**
* Get the region server group this table belongs to. The regions of this table will be placed
* only on the region servers within this group. If not present, will be placed on
* {@link org.apache.hadoop.hbase.rsgroup.RSGroupInfo#DEFAULT_GROUP}.
*/
Optional getRegionServerGroup();
}
