OneMergeWrappingMergePolicy

Determine what set of merge operations is necessary in order to expunge all deletes from the index.

Determine what set of merge operations is necessary in order to merge to <= the specified segment count. IndexWriter calls this when its IndexWriter.forceMerge method is called. This call is always synchronized on the IndexWriter instance so only one thread at a time will call this method.

Identifies merges that we want to execute (synchronously) on commit. By default, this will return .findMerges whose segments are all less than the .maxFullFlushMergeSize.

Define the set of merge operations to perform on provided codec readers in .

Determine what set of merge operations are now necessary on the index. IndexWriter calls this whenever there is a change to the segments. This call is always synchronized on the IndexWriter instance so only one thread at a time will call this method.

Returns true if the segment represented by the given CodecReader should be kept even if it's fully deleted. This is useful for testing of for instance if the merge policy implements retention policies for soft deletes.

Return the maximum size of segments to be included in full-flush merges by the default implementation of .findFullFlushMerges.

Returns the number of deletes that a merge would claim on the given segment. This method will by default return the sum of the del count on disk and the pending delete count. Yet, subclasses that wrap merge readers might modify this to reflect deletes that are carried over to the target segment in the case of soft deletes.

Return the byte size of the provided SegmentCommitInfo, prorated by percentage of non-deleted documents.

Unwraps this instance

Returns true if a new segment (regardless of its origin) should use the compound file format. The default implementation returns true iff the size of the given mergedInfo is less or equal to .getMaxCFSSegmentSizeMB and the size is less or equal to the TotalIndexSize * .getNoCFSRatio otherwise false.