LogDocMergePolicy (Lucene 3.6.2 API)

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java.lang.Object
- org.apache.lucene.index.MergePolicy
- - org.apache.lucene.index.LogMergePolicy
  - - org.apache.lucene.index.LogDocMergePolicy

All Implemented Interfaces:

Closeable, AutoCloseable
```
public class LogDocMergePolicy
extends LogMergePolicy
```
This is a LogMergePolicy that measures size of a segment as the number of documents (not taking deletions into account).

Nested Class Summary
- Nested classes/interfaces inherited from class org.apache.lucene.index.MergePolicy
  MergePolicy.MergeAbortedException, MergePolicy.MergeException, MergePolicy.MergeSpecification, MergePolicy.OneMerge

Field Summary

Fields
Modifier and Type Field Description

static int DEFAULT_MIN_MERGE_DOCS
Default minimum segment size.
- Fields inherited from class org.apache.lucene.index.LogMergePolicy
  calibrateSizeByDeletes, DEFAULT_MAX_MERGE_DOCS, DEFAULT_MERGE_FACTOR, DEFAULT_NO_CFS_RATIO, LEVEL_LOG_SPAN, maxMergeDocs, maxMergeSize, maxMergeSizeForForcedMerge, mergeFactor, minMergeSize, noCFSRatio, useCompoundFile
- Fields inherited from class org.apache.lucene.index.MergePolicy
  writer

Constructor Summary

Constructors
Constructor Description

LogDocMergePolicy()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`int`	`getMinMergeDocs()`	Get the minimum size for a segment to remain un-merged.
`void`	`setMinMergeDocs(int minMergeDocs)`	Sets the minimum size for the lowest level segments.
`protected long`	`size(SegmentInfo info)`

Methods inherited from class org.apache.lucene.index.LogMergePolicy
close, findForcedDeletesMerges, findForcedMerges, findMerges, getCalibrateSizeByDeletes, getMaxMergeDocs, getMergeFactor, getNoCFSRatio, getUseCompoundFile, isMerged, isMerged, message, setCalibrateSizeByDeletes, setMaxMergeDocs, setMergeFactor, setNoCFSRatio, setUseCompoundFile, sizeBytes, sizeDocs, toString, useCompoundFile, verbose

Methods inherited from class org.apache.lucene.index.MergePolicy
setIndexWriter

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Field Detail
  - DEFAULT_MIN_MERGE_DOCS
```
public static final int DEFAULT_MIN_MERGE_DOCS
```
    Default minimum segment size. @see setMinMergeDocs
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - LogDocMergePolicy
```
public LogDocMergePolicy()
```
- Method Detail
  - size
```
protected long size(SegmentInfo info)
             throws IOException
```
    Specified by:
    
    size in class LogMergePolicy
    
    Throws:
    
    IOException
  - setMinMergeDocs
```
public void setMinMergeDocs(int minMergeDocs)
```
    Sets the minimum size for the lowest level segments. Any segments below this size are considered to be on the same level (even if they vary drastically in size) and will be merged whenever there are mergeFactor of them. This effectively truncates the "long tail" of small segments that would otherwise be created into a single level. If you set this too large, it could greatly increase the merging cost during indexing (if you flush many small segments).
  - getMinMergeDocs
```
public int getMinMergeDocs()
```
    Get the minimum size for a segment to remain un-merged.
    
    See Also:
    
    setMinMergeDocs(int)

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