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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
package org.rocksdb;
import java.util.Map;
/**
* SstFileManager is used to track SST files in the DB and control their
* deletion rate.
*
* All SstFileManager public functions are thread-safe.
*
* SstFileManager is not extensible.
*/
//@ThreadSafe
public final class SstFileManager extends RocksObject {
public static final long RATE_BYTES_PER_SEC_DEFAULT = 0;
public static final boolean DELETE_EXISTING_TRASH_DEFAULT = true;
public static final double MAX_TRASH_DB_RATION_DEFAULT = 0.25;
public static final long BYTES_MAX_DELETE_CHUNK_DEFAULT = 64 * 1024 * 1024;
/**
* Create a new SstFileManager that can be shared among multiple RocksDB
* instances to track SST file and control there deletion rate.
*
* @param env the environment.
*
* @throws RocksDBException thrown if error happens in underlying native library.
*/
public SstFileManager(final Env env) throws RocksDBException {
this(env, null);
}
/**
* Create a new SstFileManager that can be shared among multiple RocksDB
* instances to track SST file and control there deletion rate.
*
* @param env the environment.
* @param logger if not null, the logger will be used to log errors.
*
* @throws RocksDBException thrown if error happens in underlying native library.
*/
public SstFileManager(final Env env, /*@Nullable*/ final Logger logger)
throws RocksDBException {
this(env, logger, RATE_BYTES_PER_SEC_DEFAULT);
}
/**
* Create a new SstFileManager that can be shared among multiple RocksDB
* instances to track SST file and control there deletion rate.
*
* @param env the environment.
* @param logger if not null, the logger will be used to log errors.
*
* == Deletion rate limiting specific arguments ==
* @param rateBytesPerSec how many bytes should be deleted per second, If
* this value is set to 1024 (1 Kb / sec) and we deleted a file of size
* 4 Kb in 1 second, we will wait for another 3 seconds before we delete
* other files, Set to 0 to disable deletion rate limiting.
*
* @throws RocksDBException thrown if error happens in underlying native library.
*/
public SstFileManager(final Env env, /*@Nullable*/ final Logger logger,
final long rateBytesPerSec) throws RocksDBException {
this(env, logger, rateBytesPerSec, MAX_TRASH_DB_RATION_DEFAULT);
}
/**
* Create a new SstFileManager that can be shared among multiple RocksDB
* instances to track SST file and control there deletion rate.
*
* @param env the environment.
* @param logger if not null, the logger will be used to log errors.
*
* == Deletion rate limiting specific arguments ==
* @param rateBytesPerSec how many bytes should be deleted per second, If
* this value is set to 1024 (1 Kb / sec) and we deleted a file of size
* 4 Kb in 1 second, we will wait for another 3 seconds before we delete
* other files, Set to 0 to disable deletion rate limiting.
* @param maxTrashDbRatio if the trash size constitutes for more than this
* fraction of the total DB size we will start deleting new files passed
* to DeleteScheduler immediately.
*
* @throws RocksDBException thrown if error happens in underlying native library.
*/
public SstFileManager(final Env env, /*@Nullable*/ final Logger logger,
final long rateBytesPerSec, final double maxTrashDbRatio)
throws RocksDBException {
this(env, logger, rateBytesPerSec, maxTrashDbRatio,
BYTES_MAX_DELETE_CHUNK_DEFAULT);
}
/**
* Create a new SstFileManager that can be shared among multiple RocksDB
* instances to track SST file and control there deletion rate.
*
* @param env the environment.
* @param logger if not null, the logger will be used to log errors.
*
* == Deletion rate limiting specific arguments ==
* @param rateBytesPerSec how many bytes should be deleted per second, If
* this value is set to 1024 (1 Kb / sec) and we deleted a file of size
* 4 Kb in 1 second, we will wait for another 3 seconds before we delete
* other files, Set to 0 to disable deletion rate limiting.
* @param maxTrashDbRatio if the trash size constitutes for more than this
* fraction of the total DB size we will start deleting new files passed
* to DeleteScheduler immediately.
* @param bytesMaxDeleteChunk if a single file is larger than delete chunk,
* ftruncate the file by this size each time, rather than dropping the whole
* file. 0 means to always delete the whole file.
*
* @throws RocksDBException thrown if error happens in underlying native library.
*/
public SstFileManager(final Env env, /*@Nullable*/final Logger logger,
final long rateBytesPerSec, final double maxTrashDbRatio,
final long bytesMaxDeleteChunk) throws RocksDBException {
super(newSstFileManager(env.nativeHandle_,
logger != null ? logger.nativeHandle_ : 0,
rateBytesPerSec, maxTrashDbRatio, bytesMaxDeleteChunk));
}
/**
* Update the maximum allowed space that should be used by RocksDB, if
* the total size of the SST files exceeds {@code maxAllowedSpace}, writes to
* RocksDB will fail.
*
* Setting {@code maxAllowedSpace} to 0 will disable this feature;
* maximum allowed space will be infinite (Default value).
*
* @param maxAllowedSpace the maximum allowed space that should be used by
* RocksDB.
*/
public void setMaxAllowedSpaceUsage(final long maxAllowedSpace) {
setMaxAllowedSpaceUsage(nativeHandle_, maxAllowedSpace);
}
/**
* Set the amount of buffer room each compaction should be able to leave.
* In other words, at its maximum disk space consumption, the compaction
* should still leave {@code compactionBufferSize} available on the disk so
* that other background functions may continue, such as logging and flushing.
*
* @param compactionBufferSize the amount of buffer room each compaction
* should be able to leave.
*/
public void setCompactionBufferSize(final long compactionBufferSize) {
setCompactionBufferSize(nativeHandle_, compactionBufferSize);
}
/**
* Determines if the total size of SST files exceeded the maximum allowed
* space usage.
*
* @return true when the maximum allows space usage has been exceeded.
*/
public boolean isMaxAllowedSpaceReached() {
return isMaxAllowedSpaceReached(nativeHandle_);
}
/**
* Determines if the total size of SST files as well as estimated size
* of ongoing compactions exceeds the maximums allowed space usage.
*
* @return true when the total size of SST files as well as estimated size
* of ongoing compactions exceeds the maximums allowed space usage.
*/
public boolean isMaxAllowedSpaceReachedIncludingCompactions() {
return isMaxAllowedSpaceReachedIncludingCompactions(nativeHandle_);
}
/**
* Get the total size of all tracked files.
*
* @return the total size of all tracked files.
*/
public long getTotalSize() {
return getTotalSize(nativeHandle_);
}
/**
* Gets all tracked files and their corresponding sizes.
*
* @return a map containing all tracked files and there corresponding sizes.
*/
public Map getTrackedFiles() {
return getTrackedFiles(nativeHandle_);
}
/**
* Gets the delete rate limit.
*
* @return the delete rate limit (in bytes per second).
*/
public long getDeleteRateBytesPerSecond() {
return getDeleteRateBytesPerSecond(nativeHandle_);
}
/**
* Set the delete rate limit.
*
* Zero means disable delete rate limiting and delete files immediately.
*
* @param deleteRate the delete rate limit (in bytes per second).
*/
public void setDeleteRateBytesPerSecond(final long deleteRate) {
setDeleteRateBytesPerSecond(nativeHandle_, deleteRate);
}
/**
* Get the trash/DB size ratio where new files will be deleted immediately.
*
* @return the trash/DB size ratio.
*/
public double getMaxTrashDBRatio() {
return getMaxTrashDBRatio(nativeHandle_);
}
/**
* Set the trash/DB size ratio where new files will be deleted immediately.
*
* @param ratio the trash/DB size ratio.
*/
public void setMaxTrashDBRatio(final double ratio) {
setMaxTrashDBRatio(nativeHandle_, ratio);
}
private native static long newSstFileManager(final long handle,
final long logger_handle, final long rateBytesPerSec,
final double maxTrashDbRatio, final long bytesMaxDeleteChunk)
throws RocksDBException;
private native void setMaxAllowedSpaceUsage(final long handle,
final long maxAllowedSpace);
private native void setCompactionBufferSize(final long handle,
final long compactionBufferSize);
private native boolean isMaxAllowedSpaceReached(final long handle);
private native boolean isMaxAllowedSpaceReachedIncludingCompactions(
final long handle);
private native long getTotalSize(final long handle);
private native Map getTrackedFiles(final long handle);
private native long getDeleteRateBytesPerSecond(final long handle);
private native void setDeleteRateBytesPerSecond(final long handle,
final long deleteRate);
private native double getMaxTrashDBRatio(final long handle);
private native void setMaxTrashDBRatio(final long handle, final double ratio);
@Override protected final native void disposeInternal(final long handle);
}
