Package org.apache.lucene.codecs.lucene40

Class Lucene40SegmentInfoFormat

  • @Deprecated
public class Lucene40SegmentInfoFormat
extends SegmentInfoFormat
    Deprecated.
    Only for reading old 4.0-4.5 segments, and supporting IndexWriter.addIndexes
    Lucene 4.0 Segment info format.

    Files:

    • .si: Header, SegVersion, SegSize, IsCompoundFile, Diagnostics, Attributes, Files

    Data types:

    Field Descriptions:

    • SegVersion is the code version that created the segment.
    • SegSize is the number of documents contained in the segment index.
    • IsCompoundFile records whether the segment is written as a compound file or not. If this is -1, the segment is not a compound file. If it is 1, the segment is a compound file.
    • Checksum contains the CRC32 checksum of all bytes in the segments_N file up until the checksum. This is used to verify integrity of the file on opening the index.
    • The Diagnostics Map is privately written by IndexWriter, as a debugging aid, for each segment it creates. It includes metadata like the current Lucene version, OS, Java version, why the segment was created (merge, flush, addIndexes), etc.
    • Attributes: a key-value map of codec-private attributes.
    • Files is a list of files referred to by this segment.

    See Also:
    SegmentInfos