com.bigdata.htree

Class HTreePageStats

java.lang.Object

com.bigdata.btree.BaseIndexStats

com.bigdata.btree.PageStats

com.bigdata.htree.HTreePageStats

public class HTreePageStats
extends PageStats

Field Summary

Fields inherited from class com.bigdata.btree.PageStats

blobs, histogram, leafBytes, maxLeafBytes, maxNodeBytes, minLeafBytes, minNodeBytes, nerrors, nodeBytes, nrawRecs, nvisited, rawRecBytes, SLOT_SIZES

Fields inherited from class com.bigdata.btree.BaseIndexStats

height, indexType, m, name, nleaves, nnodes, ntuples

Constructor Summary

Constructors

Constructor and Description
HTreePageStats()

Method Summary

Methods

Modifier and Type	Method and Description
int	getRecommendedBranchingFactor() This computes the recommended branching factor for the index based on an examination of the current branching factor, an assumed nominal page size of 8k, the min, max, and average node and leaf sizes, and the histogram of the allocation sizes for the index.
void	visit(AbstractHTree htree, com.bigdata.htree.AbstractPage node)

Methods inherited from class com.bigdata.btree.PageStats

getBytesPerLeaf, getBytesPerNode, getBytesPerRawRecord, getDataRow, getHeaderRow, getTotalBytes, toString, trackSlotSize, visit

Methods inherited from class com.bigdata.btree.BaseIndexStats

writeOn

Methods inherited from class java.lang.Object

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

Constructor Detail

HTreePageStats

public HTreePageStats()

Method Detail

visit

public void visit(AbstractHTree htree,
         com.bigdata.htree.AbstractPage node)

getRecommendedBranchingFactor

public int getRecommendedBranchingFactor()

This computes the recommended branching factor for the index based on an examination of the current branching factor, an assumed nominal page size of 8k, the min, max, and average node and leaf sizes, and the histogram of the allocation sizes for the index. TODO This method always returns the current value of [addressBits]. It should be modified to compute a target value for [addressBits] based on the same criteria that are used for the B+Tree.

Specified by:

getRecommendedBranchingFactor in class PageStats

Returns:

See Also:

Optimize RWStore allocator sizes TODO This says "branching factor", but {@link #m} is overloaded and is the branching factor for the BTree and the addressBits for the HTree. This method should be renamed (or moved into the concrete instances of this class).