org.apache.flink.contrib.streaming.state.sstmerge

Interface RocksDBManualCompactionManager

All Superinterfaces:

AutoCloseable

public interface RocksDBManualCompactionManager
extends AutoCloseable

Manages compactions of small and disjoint RocksDB SST files that otherwise would not be merged to reduce write amplification.

Such files are usually small and are inlined into the Checkpoint metadata. Which might lead to exceeding RPC message size on checkpoint ACK or recovery.

This class manages compactions of one or more Column Families of a single RocksDB instance.

Note that "manual" means that the compactions are requested manually (by Flink), but they are still executed by RocksDB.

Field Summary

Fields

Modifier and Type	Field and Description
static org.slf4j.Logger	LOG
static RocksDBManualCompactionManager	NO_OP

Method Summary

Modifier and Type	Method and Description
void	close()
static RocksDBManualCompactionManager	create(org.rocksdb.RocksDB db, RocksDBManualCompactionConfig settings, ExecutorService ioExecutor)
void	register(RocksDBKeyedStateBackend.RocksDbKvStateInfo stateInfo)
void	start()

Field Detail

LOG

static final org.slf4j.Logger LOG

NO_OP

static final RocksDBManualCompactionManager NO_OP

Method Detail

create

static RocksDBManualCompactionManager create(org.rocksdb.RocksDB db,
                                             RocksDBManualCompactionConfig settings,
                                             ExecutorService ioExecutor)

register

void register(RocksDBKeyedStateBackend.RocksDbKvStateInfo stateInfo)

close

void close()
    throws Exception

Specified by:

close in interface AutoCloseable

Throws:

Exception

start

void start()