Lucene.Net
3.0.3
Lucene.Net is a port of the Lucene search engine library, written in C# and targeted at .NET runtime users.
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This class implements a MergePolicy that tries to merge segments into levels of exponentially increasing size, where each level has fewer segments than the value of the merge factor. Whenever extra segments (beyond the merge factor upper bound) are encountered, all segments within the level are merged. You can get or set the merge factor using MergeFactor and MergeFactor respectively. More...
Inherits Lucene.Net.Index.MergePolicy.
Inherited by Lucene.Net.Index.LogByteSizeMergePolicy, and Lucene.Net.Index.LogDocMergePolicy.
Public Member Functions | |
override bool | UseCompoundFile (SegmentInfos infos, SegmentInfo info) |
Returns true if a newly flushed (not from merge) segment should use the compound file format. | |
virtual void | SetUseCompoundFile (bool useCompoundFile) |
Gets or sets whether compound file format should be used for newly flushed and newly merged segments. | |
virtual bool | GetUseCompoundFile () |
override bool | UseCompoundDocStore (SegmentInfos infos) |
Returns true if the doc store files should use the compound file format. | |
virtual void | SetUseCompoundDocStore (bool useCompoundDocStore) |
Sets whether compound file format should be used for newly flushed and newly merged doc store segment files (term vectors and stored fields). | |
virtual bool | GetUseCompoundDocStore () |
Returns true if newly flushed and newly merge doc store segment files (term vectors and stored fields) | |
override MergeSpecification | FindMergesForOptimize (SegmentInfos infos, int maxNumSegments, ISet< SegmentInfo > segmentsToOptimize) |
Returns the merges necessary to optimize the index. This merge policy defines "optimized" to mean only one segment in the index, where that segment has no deletions pending nor separate norms, and it is in compound file format if the current useCompoundFile setting is true. This method returns multiple merges (mergeFactor at a time) so the MergeScheduler in use may make use of concurrency. | |
override MergeSpecification | FindMergesToExpungeDeletes (SegmentInfos segmentInfos) |
Finds merges necessary to expunge all deletes from the index. We simply merge adjacent segments that have deletes, up to mergeFactor at a time. | |
override MergeSpecification | FindMerges (SegmentInfos infos) |
Checks if any merges are now necessary and returns a MergePolicy.MergeSpecification if so. A merge is necessary when there are more than MergeFactor segments at a given level. When multiple levels have too many segments, this method will return multiple merges, allowing the MergeScheduler to use concurrency. | |
Public Member Functions inherited from Lucene.Net.Index.MergePolicy | |
void | Close () |
Release all resources for the policy. | |
void | Dispose () |
Release all resources for the policy. | |
Public Attributes | |
const double | LEVEL_LOG_SPAN = 0.75 |
Defines the allowed range of log(size) for each level. A level is computed by taking the max segment log size, minus LEVEL_LOG_SPAN, and finding all segments falling within that range. | |
const int | DEFAULT_MERGE_FACTOR = 10 |
Default merge factor, which is how many segments are merged at a time | |
Static Public Attributes | |
static readonly int | DEFAULT_MAX_MERGE_DOCS = System.Int32.MaxValue |
Default maximum segment size. A segment of this size | |
static double | DEFAULT_NO_CFS_RATIO = 0.1 |
Default noCFSRatio. If a merge's size is >= 10% of the index, then we disable compound file for it. See NoCFSRatio | |
Protected Member Functions | |
LogMergePolicy (IndexWriter writer) | |
OneMerge | MakeOneMerge (SegmentInfos infos, SegmentInfos infosToMerge) |
Protected Member Functions inherited from Lucene.Net.Index.MergePolicy | |
MergePolicy (IndexWriter writer) | |
abstract void | Dispose (bool disposing) |
Protected Attributes | |
double | internalNoCFSRatio = DEFAULT_NO_CFS_RATIO |
Properties | |
double | NoCFSRatio [get, set] |
virtual int | MergeFactor [get, set] |
Gets or sets how often segment indices are merged by addDocument(). With smaller values, less RAM is used while indexing, and searches on unoptimized indices are faster, but indexing speed is slower. With larger values, more RAM is used during indexing, and while searches on unoptimized indices are slower, indexing is faster. Thus larger values (> 10) are best for batch index creation, and smaller values (< 10) for indices that are interactively maintained. | |
virtual bool | CalibrateSizeByDeletes [get, set] |
Gets or sets whether the segment size should be calibrated by the number of deletes when choosing segments for merge. | |
virtual int | MaxMergeDocs [get, set] |
Gets or sets the largest segment (measured by document count) that may be merged with other segments. Determines the largest segment (measured by document count) that may be merged with other segments. Small values (e.g., less than 10,000) are best for interactive indexing, as this limits the length of pauses while indexing to a few seconds. Larger values are best for batched indexing and speedier searches. | |
This class implements a MergePolicy that tries to merge segments into levels of exponentially increasing size, where each level has fewer segments than the value of the merge factor. Whenever extra segments (beyond the merge factor upper bound) are encountered, all segments within the level are merged. You can get or set the merge factor using MergeFactor and MergeFactor respectively.
This class is abstract and requires a subclass to define the Size method which specifies how a segment's size is determined. LogDocMergePolicy is one subclass that measures size by document count in the segment. LogByteSizeMergePolicy is another subclass that measures size as the total byte size of the file(s) for the segment.
Definition at line 42 of file LogMergePolicy.cs.
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Definition at line 82 of file LogMergePolicy.cs.
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Checks if any merges are now necessary and returns a MergePolicy.MergeSpecification if so. A merge is necessary when there are more than MergeFactor segments at a given level. When multiple levels have too many segments, this method will return multiple merges, allowing the MergeScheduler to use concurrency.
Implements Lucene.Net.Index.MergePolicy.
Definition at line 413 of file LogMergePolicy.cs.
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Returns the merges necessary to optimize the index. This merge policy defines "optimized" to mean only one segment in the index, where that segment has no deletions pending nor separate norms, and it is in compound file format if the current useCompoundFile setting is true. This method returns multiple merges (mergeFactor at a time) so the MergeScheduler in use may make use of concurrency.
Implements Lucene.Net.Index.MergePolicy.
Definition at line 259 of file LogMergePolicy.cs.
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Finds merges necessary to expunge all deletes from the index. We simply merge adjacent segments that have deletes, up to mergeFactor at a time.
Implements Lucene.Net.Index.MergePolicy.
Definition at line 354 of file LogMergePolicy.cs.
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Returns true if newly flushed and newly merge doc store segment files (term vectors and stored fields)
Definition at line 177 of file LogMergePolicy.cs.
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Definition at line 151 of file LogMergePolicy.cs.
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Definition at line 526 of file LogMergePolicy.cs.
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Sets whether compound file format should be used for newly flushed and newly merged doc store segment files (term vectors and stored fields).
Definition at line 166 of file LogMergePolicy.cs.
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Gets or sets whether compound file format should be used for newly flushed and newly merged segments.
Definition at line 145 of file LogMergePolicy.cs.
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Returns true if the doc store files should use the compound file format.
Implements Lucene.Net.Index.MergePolicy.
Definition at line 157 of file LogMergePolicy.cs.
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Returns true if a newly flushed (not from merge) segment should use the compound file format.
Implements Lucene.Net.Index.MergePolicy.
Definition at line 137 of file LogMergePolicy.cs.
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Default maximum segment size. A segment of this size
Definition at line 60 of file LogMergePolicy.cs.
const int Lucene.Net.Index.LogMergePolicy.DEFAULT_MERGE_FACTOR = 10 |
Default merge factor, which is how many segments are merged at a time
Definition at line 55 of file LogMergePolicy.cs.
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Default noCFSRatio. If a merge's size is >= 10% of the index, then we disable compound file for it. See NoCFSRatio
Definition at line 66 of file LogMergePolicy.cs.
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Definition at line 74 of file LogMergePolicy.cs.
const double Lucene.Net.Index.LogMergePolicy.LEVEL_LOG_SPAN = 0.75 |
Defines the allowed range of log(size) for each level. A level is computed by taking the max segment log size, minus LEVEL_LOG_SPAN, and finding all segments falling within that range.
Definition at line 50 of file LogMergePolicy.cs.
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Gets or sets whether the segment size should be calibrated by the number of deletes when choosing segments for merge.
Definition at line 186 of file LogMergePolicy.cs.
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Gets or sets the largest segment (measured by document count) that may be merged with other segments. Determines the largest segment (measured by document count) that may be merged with other segments. Small values (e.g., less than 10,000) are best for interactive indexing, as this limits the length of pauses while indexing to a few seconds. Larger values are best for batched indexing and speedier searches.
The default value is int.MaxValue.
The default merge policy (LogByteSizeMergePolicy) also allows you to set this limit by net size (in MB) of the segment, using LogByteSizeMergePolicy.MaxMergeMB.
Definition at line 575 of file LogMergePolicy.cs.
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Gets or sets how often segment indices are merged by addDocument(). With smaller values, less RAM is used while indexing, and searches on unoptimized indices are faster, but indexing speed is slower. With larger values, more RAM is used during indexing, and while searches on unoptimized indices are slower, indexing is faster. Thus larger values (> 10) are best for batch index creation, and smaller values (< 10) for indices that are interactively maintained.
Definition at line 127 of file LogMergePolicy.cs.
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Definition at line 92 of file LogMergePolicy.cs.