Class Lucene46SegmentInfoFormat

java.lang.Object
org.apache.lucene.codecs.SegmentInfoFormat
org.apache.lucene.codecs.lucene46.Lucene46SegmentInfoFormat

public class Lucene46SegmentInfoFormat extends SegmentInfoFormat
Lucene 4.6 Segment info format.

Files:

  • .si: Header, SegVersion, SegSize, IsCompoundFile, Diagnostics, 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.
  • Files is a list of files referred to by this segment.

See Also: