public final class SortingMergePolicy extends MergePolicy
MergePolicy
that reorders documents according to a Sort
before merging them. As a consequence, all segments resulting from a merge
will be sorted while segments resulting from a flush will be in the order
in which documents have been added.
NOTE: Never use this policy if you rely on
IndexWriter.addDocuments
to have sequentially-assigned doc IDs, this policy will scatter doc IDs.
NOTE: This policy should only be used with idempotent Sort
s
so that the order of segments is predictable. For example, using
Sort.INDEXORDER
in reverse (which is not idempotent) will make
the order of documents in a segment depend on the number of times the segment
has been merged.
MergePolicy.DocMap, MergePolicy.MergeAbortedException, MergePolicy.MergeException, MergePolicy.MergeSpecification, MergePolicy.OneMerge
Modifier and Type | Field and Description |
---|---|
static String |
SORTER_ID_PROP
Put in the
diagnostics to denote that
this segment is sorted. |
DEFAULT_MAX_CFS_SEGMENT_SIZE, DEFAULT_NO_CFS_RATIO, maxCFSSegmentSize, noCFSRatio
Constructor and Description |
---|
SortingMergePolicy(MergePolicy in,
Sort sort)
Create a new
MergePolicy that sorts documents with the given sort . |
Modifier and Type | Method and Description |
---|---|
MergePolicy.MergeSpecification |
findForcedDeletesMerges(SegmentInfos segmentInfos,
IndexWriter writer) |
MergePolicy.MergeSpecification |
findForcedMerges(SegmentInfos segmentInfos,
int maxSegmentCount,
Map<SegmentCommitInfo,Boolean> segmentsToMerge,
IndexWriter writer) |
MergePolicy.MergeSpecification |
findMerges(MergeTrigger mergeTrigger,
SegmentInfos segmentInfos,
IndexWriter writer) |
Sort |
getSort()
Return the
Sort order that is used to sort segments when merging. |
static boolean |
isSorted(LeafReader reader,
Sort sort)
Returns
true if the given reader is sorted by the
sort given. |
protected long |
size(SegmentCommitInfo info,
IndexWriter writer) |
String |
toString() |
boolean |
useCompoundFile(SegmentInfos segments,
SegmentCommitInfo newSegment,
IndexWriter writer) |
getMaxCFSSegmentSizeMB, getNoCFSRatio, isMerged, setMaxCFSSegmentSizeMB, setNoCFSRatio
public static final String SORTER_ID_PROP
diagnostics
to denote that
this segment is sorted.public SortingMergePolicy(MergePolicy in, Sort sort)
MergePolicy
that sorts documents with the given sort
.public static boolean isSorted(LeafReader reader, Sort sort)
true
if the given reader
is sorted by the
sort
given. Typically the given sort
would be the
getSort()
order of a SortingMergePolicy
.public MergePolicy.MergeSpecification findMerges(MergeTrigger mergeTrigger, SegmentInfos segmentInfos, IndexWriter writer) throws IOException
findMerges
in class MergePolicy
IOException
public MergePolicy.MergeSpecification findForcedMerges(SegmentInfos segmentInfos, int maxSegmentCount, Map<SegmentCommitInfo,Boolean> segmentsToMerge, IndexWriter writer) throws IOException
findForcedMerges
in class MergePolicy
IOException
public MergePolicy.MergeSpecification findForcedDeletesMerges(SegmentInfos segmentInfos, IndexWriter writer) throws IOException
findForcedDeletesMerges
in class MergePolicy
IOException
public boolean useCompoundFile(SegmentInfos segments, SegmentCommitInfo newSegment, IndexWriter writer) throws IOException
useCompoundFile
in class MergePolicy
IOException
protected long size(SegmentCommitInfo info, IndexWriter writer) throws IOException
size
in class MergePolicy
IOException
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