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Server functionality for HBase
/**
* 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.regionserver;
import java.io.IOException;
import java.util.Collection;
import java.util.OptionalDouble;
import java.util.OptionalLong;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.hbase.CellComparator;
import org.apache.hadoop.hbase.HBaseInterfaceAudience;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.ColumnFamilyDescriptor;
import org.apache.hadoop.hbase.client.RegionInfo;
import org.apache.yetus.audience.InterfaceAudience;
import org.apache.yetus.audience.InterfaceStability;
/**
* Interface for objects that hold a column family in a Region. Its a memstore and a set of zero or
* more StoreFiles, which stretch backwards over time.
*/
@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.COPROC)
@InterfaceStability.Evolving
public interface Store {
/**
* The default priority for user-specified compaction requests.
* The user gets top priority unless we have blocking compactions. (Pri <= 0)
*/
int PRIORITY_USER = 1;
int NO_PRIORITY = Integer.MIN_VALUE;
// General Accessors
CellComparator getComparator();
Collection getStorefiles();
Collection getCompactedFiles();
/**
* When was the last edit done in the memstore
*/
long timeOfOldestEdit();
FileSystem getFileSystem();
/**
* Tests whether we should run a major compaction. For example, if the configured major compaction
* interval is reached.
* @return true if we should run a major compaction.
*/
boolean shouldPerformMajorCompaction() throws IOException;
/**
* See if there's too much store files in this store
* @return true if number of store files is greater than the number defined in
* minFilesToCompact
*/
boolean needsCompaction();
int getCompactPriority();
/**
* Returns whether this store is splittable, i.e., no reference file in this store.
*/
boolean canSplit();
/**
* @return true if the store has any underlying reference files to older HFiles
*/
boolean hasReferences();
/**
* @return The size of this store's memstore.
*/
MemStoreSize getMemStoreSize();
/**
* @return The amount of memory we could flush from this memstore; usually this is equal to
* {@link #getMemStoreSize()} unless we are carrying snapshots and then it will be the size of
* outstanding snapshots.
*/
MemStoreSize getFlushableSize();
/**
* @return size of the memstore snapshot
*/
MemStoreSize getSnapshotSize();
ColumnFamilyDescriptor getColumnFamilyDescriptor();
/**
* @return The maximum sequence id in all store files.
*/
OptionalLong getMaxSequenceId();
/**
* @return The maximum memstoreTS in all store files.
*/
OptionalLong getMaxMemStoreTS();
/** @return aggregate size of all HStores used in the last compaction */
long getLastCompactSize();
/** @return aggregate size of HStore */
long getSize();
/**
* @return Count of store files
*/
int getStorefilesCount();
/**
* @return Count of compacted store files
*/
int getCompactedFilesCount();
/**
* @return Max age of store files in this store
*/
OptionalLong getMaxStoreFileAge();
/**
* @return Min age of store files in this store
*/
OptionalLong getMinStoreFileAge();
/**
* @return Average age of store files in this store
*/
OptionalDouble getAvgStoreFileAge();
/**
* @return Number of reference files in this store
*/
long getNumReferenceFiles();
/**
* @return Number of HFiles in this store
*/
long getNumHFiles();
/**
* @return The size of the store files, in bytes, uncompressed.
*/
long getStoreSizeUncompressed();
/**
* @return The size of the store files, in bytes.
*/
long getStorefilesSize();
/**
* @return The size of only the store files which are HFiles, in bytes.
*/
long getHFilesSize();
/**
* @return The size of the store file root-level indexes, in bytes.
*/
long getStorefilesRootLevelIndexSize();
/**
* Returns the total size of all index blocks in the data block indexes, including the root level,
* intermediate levels, and the leaf level for multi-level indexes, or just the root level for
* single-level indexes.
* @return the total size of block indexes in the store
*/
long getTotalStaticIndexSize();
/**
* Returns the total byte size of all Bloom filter bit arrays. For compound Bloom filters even the
* Bloom blocks currently not loaded into the block cache are counted.
* @return the total size of all Bloom filters in the store
*/
long getTotalStaticBloomSize();
/**
* @return the parent region info hosting this store
*/
RegionInfo getRegionInfo();
boolean areWritesEnabled();
/**
* @return The smallest mvcc readPoint across all the scanners in this
* region. Writes older than this readPoint, are included in every
* read operation.
*/
long getSmallestReadPoint();
String getColumnFamilyName();
TableName getTableName();
/**
* @return The number of cells flushed to disk
*/
long getFlushedCellsCount();
/**
* @return The total size of data flushed to disk, in bytes
*/
long getFlushedCellsSize();
/**
* @return The total size of out output files on disk, in bytes
*/
long getFlushedOutputFileSize();
/**
* @return The number of cells processed during minor compactions
*/
long getCompactedCellsCount();
/**
* @return The total amount of data processed during minor compactions, in bytes
*/
long getCompactedCellsSize();
/**
* @return The number of cells processed during major compactions
*/
long getMajorCompactedCellsCount();
/**
* @return The total amount of data processed during major compactions, in bytes
*/
long getMajorCompactedCellsSize();
/**
* @return Whether this store has too many store files.
*/
boolean hasTooManyStoreFiles();
/**
* Checks the underlying store files, and opens the files that have not been opened, and removes
* the store file readers for store files no longer available. Mainly used by secondary region
* replicas to keep up to date with the primary region files.
* @throws IOException
*/
void refreshStoreFiles() throws IOException;
/**
* This value can represent the degree of emergency of compaction for this store. It should be
* greater than or equal to 0.0, any value greater than 1.0 means we have too many store files.
*
* - if getStorefilesCount <= getMinFilesToCompact, return 0.0
* - return (getStorefilesCount - getMinFilesToCompact) / (blockingFileCount -
* getMinFilesToCompact)
*
*
* And for striped stores, we should calculate this value by the files in each stripe separately
* and return the maximum value.
*
* It is similar to {@link #getCompactPriority()} except that it is more suitable to use in a
* linear formula.
*/
double getCompactionPressure();
boolean isPrimaryReplicaStore();
/**
* @return true if the memstore may need some extra memory space
*/
boolean isSloppyMemStore();
int getCurrentParallelPutCount();
/**
* @return the number of read requests purely from the memstore.
*/
long getMemstoreOnlyRowReadsCount();
/**
* @return the number of read requests from the files under this store.
*/
long getMixedRowReadsCount();
/**
* @return a read only configuration of this store; throws {@link UnsupportedOperationException}
* if you try to set a configuration.
*/
Configuration getReadOnlyConfiguration();
}