SegmentInfos Fields

The fields of the SegmentInfos class are listed below. For a complete list of SegmentInfos class members, see the SegmentInfos Members topic.

FORMAT	The file format version, a negative number.
FORMAT_LOCKLESS	This format adds details used for lockless commits. It differs slightly from the previous format in that file names are never re-used (write once). Instead, each file is written to the next generation. For example, segments_1, segments_2, etc. This allows us to not use a commit lock. See file formats for details.
FORMAT_SINGLE_NORM_FILE	This is the current file format written. It adds a "hasSingleNormFile" flag into each segment info. See LUCENE-756 for details.