Package org.rocksdb

Class MemoryUtil

java.lang.Object

org.rocksdb.MemoryUtil

public class MemoryUtil
extends Object

JNI passthrough for MemoryUtil.

Constructor Summary

Constructors

Constructor	Description
MemoryUtil()

Method Summary

Modifier and Type	Method	Description
static Map<MemoryUsageType,Long>	getApproximateMemoryUsageByType(List<RocksDB> dbs, Set<Cache> caches)	Returns the approximate memory usage of different types in the input list of DBs and Cache set.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

MemoryUtil

public MemoryUtil()

Method Details

getApproximateMemoryUsageByType

public static Map<MemoryUsageType,Long> getApproximateMemoryUsageByType(List<RocksDB> dbs,
 Set<Cache> caches)

Returns the approximate memory usage of different types in the input list of DBs and Cache set. For instance, in the output map the key kMemTableTotal will be associated with the memory usage of all the mem-tables from all the input rocksdb instances.

Note that for memory usage inside Cache class, we will only report the usage of the input "cache_set" without including those Cache usage inside the input list "dbs" of DBs.

Parameters:

dbs - List of dbs to collect memory usage for.

caches - Set of caches to collect memory usage for.

Returns:

Map from MemoryUsageType to memory usage as a Long.