Lucene.Net  3.0.3
Lucene.Net is a .NET port of the Java Lucene Indexing Library
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Lucene.Net.Index.MergePolicy Class Referenceabstract

Expert: a MergePolicy determines the sequence of primitive merge operations to be used for overall merge and optimize operations. More...

Inherits IDisposable.

Inherited by Lucene.Net.Index.LogMergePolicy.

Classes

class  MergeAbortedException
 
class  MergeException
 Exception thrown if there are any problems while executing a merge. More...
 
class  MergeSpecification
 A MergeSpecification instance provides the information necessary to perform multiple merges. It simply contains a list of OneMerge instances. More...
 
class  OneMerge
 OneMerge provides the information necessary to perform an individual primitive merge operation, resulting in a single new segment. The merge spec includes the subset of segments to be merged as well as whether the new segment should use the compound file format. More...
 

Public Member Functions

abstract MergeSpecification FindMerges (SegmentInfos segmentInfos)
 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.
 
abstract MergeSpecification FindMergesForOptimize (SegmentInfos segmentInfos, int maxSegmentCount, ISet< SegmentInfo > segmentsToOptimize)
 Determine what set of merge operations is necessary in order to optimize the index. IndexWriter calls this when its IndexWriter.Optimize() method is called. This call is always synchronized on the IndexWriter instance so only one thread at a time will call this method.
 
abstract MergeSpecification FindMergesToExpungeDeletes (SegmentInfos segmentInfos)
 Determine what set of merge operations is necessary in order to expunge all deletes from the index.
 
void Close ()
 Release all resources for the policy.
 
void Dispose ()
 Release all resources for the policy.
 
abstract bool UseCompoundFile (SegmentInfos segments, SegmentInfo newSegment)
 Returns true if a newly flushed (not from merge) segment should use the compound file format.
 
abstract bool UseCompoundDocStore (SegmentInfos segments)
 Returns true if the doc store files should use the compound file format.
 

Protected Member Functions

 MergePolicy (IndexWriter writer)
 
abstract void Dispose (bool disposing)
 

Detailed Description

Expert: a MergePolicy determines the sequence of primitive merge operations to be used for overall merge and optimize operations.

Whenever the segments in an index have been altered by IndexWriter, either the addition of a newly flushed segment, addition of many segments from addIndexes* calls, or a previous merge that may now need to cascade, IndexWriter invokes FindMerges to give the MergePolicy a chance to pick merges that are now required. This method returns a MergeSpecification instance describing the set of merges that should be done, or null if no merges are necessary. When IndexWriter.optimize is called, it calls FindMergesForOptimize and the MergePolicy should then return the necessary merges.

Note that the policy can return more than one merge at a time. In this case, if the writer is using SerialMergeScheduler , the merges will be run sequentially but if it is using ConcurrentMergeScheduler they will be run concurrently.

The default MergePolicy is LogByteSizeMergePolicy .

NOTE: This API is new and still experimental (subject to change suddenly in the next release)

NOTE: This class typically requires access to package-private APIs (e.g. SegmentInfos) to do its job; if you implement your own MergePolicy, you'll need to put it in package Lucene.Net.Index in order to use these APIs.

Definition at line 61 of file MergePolicy.cs.

Constructor & Destructor Documentation

Lucene.Net.Index.MergePolicy.MergePolicy ( IndexWriter  writer)
protected

Definition at line 243 of file MergePolicy.cs.

Member Function Documentation

void Lucene.Net.Index.MergePolicy.Close ( )

Release all resources for the policy.

Definition at line 286 of file MergePolicy.cs.

void Lucene.Net.Index.MergePolicy.Dispose ( )

Release all resources for the policy.

Definition at line 292 of file MergePolicy.cs.

abstract void Lucene.Net.Index.MergePolicy.Dispose ( bool  disposing)
protectedpure virtual
abstract MergeSpecification Lucene.Net.Index.MergePolicy.FindMerges ( SegmentInfos  segmentInfos)
pure virtual

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.

Parameters
segmentInfosthe total set of segments in the index

Implemented in Lucene.Net.Index.LogMergePolicy.

abstract MergeSpecification Lucene.Net.Index.MergePolicy.FindMergesForOptimize ( SegmentInfos  segmentInfos,
int  maxSegmentCount,
ISet< SegmentInfo segmentsToOptimize 
)
pure virtual

Determine what set of merge operations is necessary in order to optimize the index. IndexWriter calls this when its IndexWriter.Optimize() method is called. This call is always synchronized on the IndexWriter instance so only one thread at a time will call this method.

Parameters
segmentInfosthe total set of segments in the index
maxSegmentCountrequested maximum number of segments in the index (currently this is always 1)
segmentsToOptimizecontains the specific SegmentInfo instances that must be merged away. This may be a subset of all SegmentInfos.

Implemented in Lucene.Net.Index.LogMergePolicy.

abstract MergeSpecification Lucene.Net.Index.MergePolicy.FindMergesToExpungeDeletes ( SegmentInfos  segmentInfos)
pure virtual

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

Parameters
segmentInfosthe total set of segments in the index

Implemented in Lucene.Net.Index.LogMergePolicy.

abstract bool Lucene.Net.Index.MergePolicy.UseCompoundDocStore ( SegmentInfos  segments)
pure virtual

Returns true if the doc store files should use the compound file format.

Implemented in Lucene.Net.Index.LogMergePolicy.

abstract bool Lucene.Net.Index.MergePolicy.UseCompoundFile ( SegmentInfos  segments,
SegmentInfo  newSegment 
)
pure virtual

Returns true if a newly flushed (not from merge) segment should use the compound file format.

Implemented in Lucene.Net.Index.LogMergePolicy.


The documentation for this class was generated from the following file: