org.apache.lucene.index
Class LogDocMergePolicy
java.lang.Object
org.apache.lucene.index.MergePolicy
org.apache.lucene.index.LogMergePolicy
org.apache.lucene.index.LogDocMergePolicy
- All Implemented Interfaces:
- Closeable, Cloneable
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).
Constructor Summary |
LogDocMergePolicy()
Sole constructor, setting all settings to their
defaults. |
Method Summary |
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(SegmentCommitInfo info)
Return the byte size of the provided SegmentCommitInfo , pro-rated by percentage of
non-deleted documents is set. |
Methods inherited from class org.apache.lucene.index.LogMergePolicy |
close, findForcedDeletesMerges, findForcedMerges, findMerges, getCalibrateSizeByDeletes, getMaxMergeDocs, getMergeFactor, isMerged, message, setCalibrateSizeByDeletes, setMaxMergeDocs, setMergeFactor, sizeBytes, sizeDocs, toString, verbose |
DEFAULT_MIN_MERGE_DOCS
public static final int DEFAULT_MIN_MERGE_DOCS
- Default minimum segment size. @see setMinMergeDocs
- See Also:
- Constant Field Values
LogDocMergePolicy
public LogDocMergePolicy()
- Sole constructor, setting all settings to their
defaults.
size
protected long size(SegmentCommitInfo info)
throws IOException
- Description copied from class:
MergePolicy
- Return the byte size of the provided
SegmentCommitInfo
, pro-rated by percentage of
non-deleted documents is set.
- Overrides:
size
in class MergePolicy
- 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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