Package org.apache.pinot.segment.local.segment.index.loader.invertedindex

Class FSTIndexHandler

java.lang.Object

org.apache.pinot.segment.local.segment.index.loader.invertedindex.FSTIndexHandler

All Implemented Interfaces:

IndexHandler

public class FSTIndexHandler
extends Object
implements IndexHandler

Helper class for fst indexes used by SegmentPreProcessor. to create FST index for column during segment load time. Currently FST index is always created (if enabled on a column) during segment generation (1) A new segment with FST index is created/refreshed. Server loads the segment. The handler detects the existence of FST index and returns. (2) A reload is issued on an existing segment with existing FST index. The handler detects the existence of FST index and returns. (3) A reload is issued on an existing segment after FST index is enabled on an existing column. Reads the dictionary to create FST index. (4) A reload is issued on an existing segment after FST index is enabled on a newly added column. In this case, the default column handler would have taken care of adding dictionary for the new column. Read the dictionary to create FST index.

Constructor Summary

Constructors

Constructor	Description
FSTIndexHandler(SegmentMetadata segmentMetadata, IndexLoadingConfig indexLoadingConfig)

Method Summary

Modifier and Type	Method	Description
boolean	needUpdateIndices(SegmentDirectory.Reader segmentReader)	Check if there is a need to add new indices or removes obsolete indices.
void	updateIndices(SegmentDirectory.Writer segmentWriter, IndexCreatorProvider indexCreatorProvider)	Adds new indices and removes obsolete indices.

Methods inherited from class java.lang.Object

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

Constructor Detail

FSTIndexHandler

public FSTIndexHandler(SegmentMetadata segmentMetadata,
                       IndexLoadingConfig indexLoadingConfig)

Method Detail

needUpdateIndices

public boolean needUpdateIndices(SegmentDirectory.Reader segmentReader)

Description copied from interface: IndexHandler

Check if there is a need to add new indices or removes obsolete indices.

Specified by:

needUpdateIndices in interface IndexHandler

Returns:

true if there is a need to update.

updateIndices

public void updateIndices(SegmentDirectory.Writer segmentWriter,
                          IndexCreatorProvider indexCreatorProvider)
                   throws Exception

Description copied from interface: IndexHandler

Adds new indices and removes obsolete indices.

Specified by:

updateIndices in interface IndexHandler

Throws:

Exception