Package org.apache.cassandra.index.sai.disk.v1.bbtree

Class NumericIndexWriter

java.lang.Object

org.apache.cassandra.index.sai.disk.v1.bbtree.NumericIndexWriter

All Implemented Interfaces:

SegmentWriter

public class NumericIndexWriter
extends Object
implements SegmentWriter

Specialized writer for values, that builds them into a BlockBalancedTreeWriter with auxiliary posting lists on eligible tree levels.

Given a sorted input, the flush process is optimised because we don't need to buffer all point values to sort them.

Field Summary

Fields

Modifier and Type	Field	Description
static final int	MAX_POINTS_IN_LEAF_NODE

Constructor Summary

Constructors

Constructor	Description
NumericIndexWriter(IndexDescriptor indexDescriptor, IndexIdentifier indexIdentifier, int bytesPerValue)
NumericIndexWriter(IndexDescriptor indexDescriptor, IndexIdentifier indexIdentifier, int maxPointsInLeafNode, int bytesPerValue)

Method Summary

Modifier and Type	Method	Description
long	getNumberOfRows()	Returns the number of rows written to the segment
String	toString()
SegmentMetadata.ComponentMetadataMap	writeCompleteSegment(Iterator<IndexEntry> iterator)	Appends a set of terms and associated postings to their respective overall SSTable component files.

Methods inherited from class java.lang.Object

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

Field Details

MAX_POINTS_IN_LEAF_NODE

public static final int MAX_POINTS_IN_LEAF_NODE

See Also:

• Constant Field Values

Constructor Details

NumericIndexWriter

public NumericIndexWriter(IndexDescriptor indexDescriptor,
 IndexIdentifier indexIdentifier,
 int bytesPerValue)

NumericIndexWriter

public NumericIndexWriter(IndexDescriptor indexDescriptor,
 IndexIdentifier indexIdentifier,
 int maxPointsInLeafNode,
 int bytesPerValue)

Method Details

toString

public String toString()

Overrides:

toString in class Object

writeCompleteSegment

public SegmentMetadata.ComponentMetadataMap writeCompleteSegment(Iterator<IndexEntry> iterator)
                                                          throws IOException

Description copied from interface: SegmentWriter

Appends a set of terms and associated postings to their respective overall SSTable component files.

Specified by:

writeCompleteSegment in interface SegmentWriter

Parameters:

iterator - an Iterator of IndexEntrys sorted in term order.

Returns:

metadata describing the location of this inverted index in the overall SSTable terms and postings component files

Throws:

IOException

getNumberOfRows

public long getNumberOfRows()

Description copied from interface: SegmentWriter

Returns the number of rows written to the segment

Specified by:

getNumberOfRows in interface SegmentWriter

Returns:

the number of rows