Package org.apache.iotdb.db.metadata.mnode.estimator

Class BasicMNodSizeEstimator

java.lang.Object

org.apache.iotdb.db.metadata.mnode.estimator.BasicMNodSizeEstimator

All Implemented Interfaces:

IMNodeSizeEstimator

Direct Known Subclasses:

CachedMNodeSizeEstimator

public class BasicMNodSizeEstimator
extends java.lang.Object
implements IMNodeSizeEstimator

Field Summary

Fields

Modifier and Type	Field	Description
protected static int	ALIAS_BASE_SIZE
protected static int	ENTITY_NODE_BASE_SIZE	The basic extra memory occupied by an EntityMNode based on InternalMNode occupation isAligned, 1B aliasChildren reference, 8B lastCacheMap, 8B
protected static int	INTERNAL_NODE_BASE_SIZE	The basic extra memory occupied by an InternalMNode based on MNode occupation template reference, 8B boolean useTemplate, 1B MNodeContainer reference and basic occupation, 8 + 80B
protected static int	MEASUREMENT_NODE_BASE_SIZE	The basic extra memory occupied by an MeasurementMNode based on MNode occupation alias reference, 8B tagOffset, 8B estimated schema size, 32B lastCache, 8B
protected static int	NODE_BASE_SIZE	The basic memory occupied by any MNode object object header, 8B node attributes name reference, name length and name hash code, 8 + 4 + 4 = 16B parent reference, 8B fullPath reference, 8B cacheEntry reference, 8B trigger reference, 8B MapEntry in parent key reference, 8B value reference, 8B entry size, see ConcurrentHashMap.Node, 28
protected static int	STORAGE_GROUP_NODE_BASE_SIZE	The basic extra memory occupied by an StorageGroupMNode based on InternalMNode occupation dataTTL, 8B fullPath length and hashCode, 4 + 4 = 8B

Constructor Summary

Constructors

Constructor	Description
BasicMNodSizeEstimator()

Method Summary

Modifier and Type	Method	Description
int	estimateSize(IMNode node)

Methods inherited from class java.lang.Object

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

Field Detail

NODE_BASE_SIZE

protected static final int NODE_BASE_SIZE

The basic memory occupied by any MNode object

1. object header, 8B
2. node attributes
   1. name reference, name length and name hash code, 8 + 4 + 4 = 16B
   2. parent reference, 8B
   3. fullPath reference, 8B
   4. cacheEntry reference, 8B
   5. trigger reference, 8B
3. MapEntry in parent
   1. key reference, 8B
   2. value reference, 8B
   3. entry size, see ConcurrentHashMap.Node, 28

See Also:

Constant Field Values

INTERNAL_NODE_BASE_SIZE

protected static final int INTERNAL_NODE_BASE_SIZE

The basic extra memory occupied by an InternalMNode based on MNode occupation

1. template reference, 8B
2. boolean useTemplate, 1B
3. MNodeContainer reference and basic occupation, 8 + 80B

See Also:

Constant Field Values

STORAGE_GROUP_NODE_BASE_SIZE

protected static final int STORAGE_GROUP_NODE_BASE_SIZE

The basic extra memory occupied by an StorageGroupMNode based on InternalMNode occupation

1. dataTTL, 8B
2. fullPath length and hashCode, 4 + 4 = 8B

See Also:

Constant Field Values

ENTITY_NODE_BASE_SIZE

protected static final int ENTITY_NODE_BASE_SIZE

The basic extra memory occupied by an EntityMNode based on InternalMNode occupation

1. isAligned, 1B
2. aliasChildren reference, 8B
3. lastCacheMap, 8B

See Also:

Constant Field Values

MEASUREMENT_NODE_BASE_SIZE

protected static final int MEASUREMENT_NODE_BASE_SIZE

The basic extra memory occupied by an MeasurementMNode based on MNode occupation

1. alias reference, 8B
2. tagOffset, 8B
3. estimated schema size, 32B
4. lastCache, 8B

See Also:

Constant Field Values

ALIAS_BASE_SIZE

protected static final int ALIAS_BASE_SIZE

See Also:

Constant Field Values

Constructor Detail

BasicMNodSizeEstimator

public BasicMNodSizeEstimator()

Method Detail

estimateSize

public int estimateSize(IMNode node)

Specified by:

estimateSize in interface IMNodeSizeEstimator