public final class IndexWriterConfig extends LiveIndexWriterConfig
IndexWriter
.
Once IndexWriter
has been created with this object, changes to this
object will not affect the IndexWriter
instance. For that, use
LiveIndexWriterConfig
that is returned from IndexWriter.getConfig()
.
All setter methods return IndexWriterConfig
to allow chaining
settings conveniently, for example:
IndexWriterConfig conf = new IndexWriterConfig(analyzer); conf.setter1().setter2();
IndexWriter.getConfig()
Modifier and Type | Class and Description |
---|---|
static class |
IndexWriterConfig.OpenMode
Specifies the open mode for
IndexWriter . |
Modifier and Type | Field and Description |
---|---|
static boolean |
DEFAULT_COMMIT_ON_CLOSE
Default value for whether calls to
IndexWriter.close() include a commit. |
static int |
DEFAULT_MAX_BUFFERED_DELETE_TERMS
Disabled by default (because IndexWriter flushes by RAM usage by default).
|
static int |
DEFAULT_MAX_BUFFERED_DOCS
Disabled by default (because IndexWriter flushes by RAM usage by default).
|
static double |
DEFAULT_RAM_BUFFER_SIZE_MB
Default value is 16 MB (which means flush when buffered docs consume
approximately 16 MB RAM).
|
static int |
DEFAULT_RAM_PER_THREAD_HARD_LIMIT_MB
Default value is 1945.
|
static boolean |
DEFAULT_READER_POOLING
Default setting for
setReaderPooling(boolean) . |
static boolean |
DEFAULT_USE_COMPOUND_FILE_SYSTEM
Default value for compound file system for newly written segments
(set to
true ). |
static int |
DISABLE_AUTO_FLUSH
Denotes a flush trigger is disabled.
|
codec, commit, commitOnClose, delPolicy, flushPolicy, indexerThreadPool, indexingChain, infoStream, mergePolicy, mergeScheduler, openMode, perThreadHardLimitMB, readerPooling, similarity, useCompoundFile
Constructor and Description |
---|
IndexWriterConfig(Analyzer analyzer)
Creates a new config that with the default
Analyzer . |
Modifier and Type | Method and Description |
---|---|
Analyzer |
getAnalyzer()
Returns the default analyzer to use for indexing documents.
|
Codec |
getCodec()
Returns the current
Codec . |
IndexCommit |
getIndexCommit()
Returns the
IndexCommit as specified in
setIndexCommit(IndexCommit) or the default,
null which specifies to open the latest index commit point. |
IndexDeletionPolicy |
getIndexDeletionPolicy()
Returns the
IndexDeletionPolicy specified in
setIndexDeletionPolicy(IndexDeletionPolicy) or
the default KeepOnlyLastCommitDeletionPolicy / |
InfoStream |
getInfoStream()
Returns
InfoStream used for debugging. |
int |
getMaxBufferedDeleteTerms()
Returns the number of buffered deleted terms that will trigger a flush of all
buffered deletes if enabled.
|
int |
getMaxBufferedDocs()
Returns the number of buffered added documents that will trigger a flush if
enabled.
|
IndexWriter.IndexReaderWarmer |
getMergedSegmentWarmer()
Returns the current merged segment warmer.
|
MergePolicy |
getMergePolicy()
Returns the current MergePolicy in use by this writer.
|
MergeScheduler |
getMergeScheduler()
Returns the
MergeScheduler that was set by
setMergeScheduler(MergeScheduler) . |
IndexWriterConfig.OpenMode |
getOpenMode()
Returns the
IndexWriterConfig.OpenMode set by setOpenMode(OpenMode) . |
double |
getRAMBufferSizeMB()
Returns the value set by
LiveIndexWriterConfig.setRAMBufferSizeMB(double) if enabled. |
int |
getRAMPerThreadHardLimitMB()
Returns the max amount of memory each
DocumentsWriterPerThread can
consume until forcefully flushed. |
boolean |
getReaderPooling()
Returns
true if IndexWriter should pool readers even if
DirectoryReader.open(IndexWriter) has not been called. |
Similarity |
getSimilarity()
Expert: returns the
Similarity implementation used by this
IndexWriter . |
IndexWriterConfig |
setCodec(Codec codec)
Set the
Codec . |
IndexWriterConfig |
setCommitOnClose(boolean commitOnClose)
Sets if calls
IndexWriter.close() should first commit
before closing. |
IndexWriterConfig |
setIndexCommit(IndexCommit commit)
Expert: allows to open a certain commit point.
|
IndexWriterConfig |
setIndexDeletionPolicy(IndexDeletionPolicy delPolicy)
Expert: allows an optional
IndexDeletionPolicy implementation to be
specified. |
IndexWriterConfig |
setInfoStream(InfoStream infoStream)
Information about merges, deletes and a
message when maxFieldLength is reached will be printed
to this.
|
IndexWriterConfig |
setInfoStream(PrintStream printStream)
Convenience method that uses
PrintStreamInfoStream . |
IndexWriterConfig |
setMaxBufferedDeleteTerms(int maxBufferedDeleteTerms)
Determines the maximum number of delete-by-term operations that will be
buffered before both the buffered in-memory delete terms and queries are
applied and flushed.
|
IndexWriterConfig |
setMaxBufferedDocs(int maxBufferedDocs)
Determines the minimal number of documents required before the buffered
in-memory documents are flushed as a new Segment.
|
IndexWriterConfig |
setMergedSegmentWarmer(IndexWriter.IndexReaderWarmer mergeSegmentWarmer)
Set the merged segment warmer.
|
IndexWriterConfig |
setMergePolicy(MergePolicy mergePolicy)
Expert:
MergePolicy is invoked whenever there are changes to the
segments in the index. |
IndexWriterConfig |
setMergeScheduler(MergeScheduler mergeScheduler)
Expert: sets the merge scheduler used by this writer.
|
IndexWriterConfig |
setOpenMode(IndexWriterConfig.OpenMode openMode)
Specifies
IndexWriterConfig.OpenMode of the index. |
IndexWriterConfig |
setRAMBufferSizeMB(double ramBufferSizeMB)
Determines the amount of RAM that may be used for buffering added documents
and deletions before they are flushed to the Directory.
|
IndexWriterConfig |
setRAMPerThreadHardLimitMB(int perThreadHardLimitMB)
Expert: Sets the maximum memory consumption per thread triggering a forced
flush if exceeded.
|
IndexWriterConfig |
setReaderPooling(boolean readerPooling)
By default, IndexWriter does not pool the
SegmentReaders it must open for deletions and
merging, unless a near-real-time reader has been
obtained by calling
DirectoryReader.open(IndexWriter) . |
IndexWriterConfig |
setSimilarity(Similarity similarity)
Expert: set the
Similarity implementation used by this IndexWriter. |
IndexWriterConfig |
setUseCompoundFile(boolean useCompoundFile)
Sets if the
IndexWriter should pack newly written segments in a
compound file. |
String |
toString() |
getCommitOnClose, getUseCompoundFile
public static final int DISABLE_AUTO_FLUSH
public static final int DEFAULT_MAX_BUFFERED_DELETE_TERMS
public static final int DEFAULT_MAX_BUFFERED_DOCS
public static final double DEFAULT_RAM_BUFFER_SIZE_MB
public static final boolean DEFAULT_READER_POOLING
setReaderPooling(boolean)
.public static final int DEFAULT_RAM_PER_THREAD_HARD_LIMIT_MB
setRAMPerThreadHardLimitMB(int)
public static final boolean DEFAULT_USE_COMPOUND_FILE_SYSTEM
true
). For batch indexing with very large
ram buffers use false
public static final boolean DEFAULT_COMMIT_ON_CLOSE
IndexWriter.close()
include a commit.public IndexWriterConfig(Analyzer analyzer)
Analyzer
. By default, TieredMergePolicy
is used
for merging;
Note that TieredMergePolicy
is free to select
non-contiguous merges, which means docIDs may not
remain monotonic over time. If this is a problem you
should switch to LogByteSizeMergePolicy
or
LogDocMergePolicy
.public IndexWriterConfig setOpenMode(IndexWriterConfig.OpenMode openMode)
IndexWriterConfig.OpenMode
of the index.
Only takes effect when IndexWriter is first created.
public IndexWriterConfig.OpenMode getOpenMode()
LiveIndexWriterConfig
IndexWriterConfig.OpenMode
set by setOpenMode(OpenMode)
.getOpenMode
in class LiveIndexWriterConfig
public IndexWriterConfig setIndexDeletionPolicy(IndexDeletionPolicy delPolicy)
IndexDeletionPolicy
implementation to be
specified. You can use this to control when prior commits are deleted from
the index. The default policy is KeepOnlyLastCommitDeletionPolicy
which removes all prior commits as soon as a new commit is done (this
matches behavior before 2.2). Creating your own policy can allow you to
explicitly keep previous "point in time" commits alive in the index for
some time, to allow readers to refresh to the new commit without having the
old commit deleted out from under them. This is necessary on filesystems
like NFS that do not support "delete on last close" semantics, which
Lucene's "point in time" search normally relies on.
NOTE: the deletion policy cannot be null.
Only takes effect when IndexWriter is first created.
public IndexDeletionPolicy getIndexDeletionPolicy()
LiveIndexWriterConfig
IndexDeletionPolicy
specified in
setIndexDeletionPolicy(IndexDeletionPolicy)
or
the default KeepOnlyLastCommitDeletionPolicy
/getIndexDeletionPolicy
in class LiveIndexWriterConfig
public IndexWriterConfig setIndexCommit(IndexCommit commit)
IndexWriter
from a near-real-time reader, if you pass the reader's
DirectoryReader.getIndexCommit()
.
Only takes effect when IndexWriter is first created.
public IndexCommit getIndexCommit()
LiveIndexWriterConfig
IndexCommit
as specified in
setIndexCommit(IndexCommit)
or the default,
null
which specifies to open the latest index commit point.getIndexCommit
in class LiveIndexWriterConfig
public IndexWriterConfig setSimilarity(Similarity similarity)
Similarity
implementation used by this IndexWriter.
NOTE: the similarity cannot be null.
Only takes effect when IndexWriter is first created.
public Similarity getSimilarity()
LiveIndexWriterConfig
Similarity
implementation used by this
IndexWriter
.getSimilarity
in class LiveIndexWriterConfig
public IndexWriterConfig setMergeScheduler(MergeScheduler mergeScheduler)
ConcurrentMergeScheduler
.
NOTE: the merge scheduler cannot be null.
Only takes effect when IndexWriter is first created.
public MergeScheduler getMergeScheduler()
LiveIndexWriterConfig
MergeScheduler
that was set by
setMergeScheduler(MergeScheduler)
.getMergeScheduler
in class LiveIndexWriterConfig
public IndexWriterConfig setCodec(Codec codec)
Codec
.
Only takes effect when IndexWriter is first created.
public Codec getCodec()
LiveIndexWriterConfig
Codec
.getCodec
in class LiveIndexWriterConfig
public MergePolicy getMergePolicy()
LiveIndexWriterConfig
getMergePolicy
in class LiveIndexWriterConfig
setMergePolicy(MergePolicy)
public IndexWriterConfig setReaderPooling(boolean readerPooling)
DirectoryReader.open(IndexWriter)
.
This method lets you enable pooling without getting a
near-real-time reader. NOTE: if you set this to
false, IndexWriter will still pool readers once
DirectoryReader.open(IndexWriter)
is called.
Only takes effect when IndexWriter is first created.
public boolean getReaderPooling()
LiveIndexWriterConfig
true
if IndexWriter
should pool readers even if
DirectoryReader.open(IndexWriter)
has not been called.getReaderPooling
in class LiveIndexWriterConfig
public IndexWriterConfig setRAMPerThreadHardLimitMB(int perThreadHardLimitMB)
DocumentsWriterPerThread
is forcefully flushed
once it exceeds this limit even if the getRAMBufferSizeMB()
has
not been exceeded. This is a safety limit to prevent a
DocumentsWriterPerThread
from address space exhaustion due to its
internal 32 bit signed integer based memory addressing.
The given value must be less that 2GB (2048MB)DEFAULT_RAM_PER_THREAD_HARD_LIMIT_MB
public int getRAMPerThreadHardLimitMB()
LiveIndexWriterConfig
DocumentsWriterPerThread
can
consume until forcefully flushed.getRAMPerThreadHardLimitMB
in class LiveIndexWriterConfig
setRAMPerThreadHardLimitMB(int)
public InfoStream getInfoStream()
LiveIndexWriterConfig
InfoStream
used for debugging.getInfoStream
in class LiveIndexWriterConfig
setInfoStream(InfoStream)
public Analyzer getAnalyzer()
LiveIndexWriterConfig
getAnalyzer
in class LiveIndexWriterConfig
public int getMaxBufferedDeleteTerms()
LiveIndexWriterConfig
getMaxBufferedDeleteTerms
in class LiveIndexWriterConfig
LiveIndexWriterConfig.setMaxBufferedDeleteTerms(int)
public int getMaxBufferedDocs()
LiveIndexWriterConfig
getMaxBufferedDocs
in class LiveIndexWriterConfig
LiveIndexWriterConfig.setMaxBufferedDocs(int)
public IndexWriter.IndexReaderWarmer getMergedSegmentWarmer()
LiveIndexWriterConfig
IndexWriter.IndexReaderWarmer
.getMergedSegmentWarmer
in class LiveIndexWriterConfig
public double getRAMBufferSizeMB()
LiveIndexWriterConfig
LiveIndexWriterConfig.setRAMBufferSizeMB(double)
if enabled.getRAMBufferSizeMB
in class LiveIndexWriterConfig
public IndexWriterConfig setInfoStream(InfoStream infoStream)
InfoStream.NO_OUTPUT
may be used to supress output.public IndexWriterConfig setInfoStream(PrintStream printStream)
PrintStreamInfoStream
. Must not be null.public IndexWriterConfig setMergePolicy(MergePolicy mergePolicy)
LiveIndexWriterConfig
MergePolicy
is invoked whenever there are changes to the
segments in the index. Its role is to select which merges to do, if any,
and return a MergePolicy.MergeSpecification
describing the merges.
It also selects merges to do for forceMerge.
Takes effect on subsequent merge selections. Any merges in flight or any
merges already registered by the previous MergePolicy
are not
affected.
setMergePolicy
in class LiveIndexWriterConfig
public IndexWriterConfig setMaxBufferedDeleteTerms(int maxBufferedDeleteTerms)
LiveIndexWriterConfig
Disabled by default (writer flushes by RAM usage).
NOTE: This setting won't trigger a segment flush.
Takes effect immediately, but only the next time a document is added, updated or deleted. Also, if you only delete-by-query, this setting has no effect, i.e. delete queries are buffered until the next segment is flushed.
setMaxBufferedDeleteTerms
in class LiveIndexWriterConfig
LiveIndexWriterConfig.setRAMBufferSizeMB(double)
public IndexWriterConfig setMaxBufferedDocs(int maxBufferedDocs)
LiveIndexWriterConfig
When this is set, the writer will flush every maxBufferedDocs added
documents. Pass in DISABLE_AUTO_FLUSH
to prevent
triggering a flush due to number of buffered documents. Note that if
flushing by RAM usage is also enabled, then the flush will be triggered by
whichever comes first.
Disabled by default (writer flushes by RAM usage).
Takes effect immediately, but only the next time a document is added, updated or deleted.
setMaxBufferedDocs
in class LiveIndexWriterConfig
LiveIndexWriterConfig.setRAMBufferSizeMB(double)
public IndexWriterConfig setMergedSegmentWarmer(IndexWriter.IndexReaderWarmer mergeSegmentWarmer)
LiveIndexWriterConfig
IndexWriter.IndexReaderWarmer
.
Takes effect on the next merge.
setMergedSegmentWarmer
in class LiveIndexWriterConfig
public IndexWriterConfig setRAMBufferSizeMB(double ramBufferSizeMB)
LiveIndexWriterConfig
When this is set, the writer will flush whenever buffered documents and
deletions use this much RAM. Pass in
DISABLE_AUTO_FLUSH
to prevent triggering a flush
due to RAM usage. Note that if flushing by document count is also enabled,
then the flush will be triggered by whichever comes first.
The maximum RAM limit is inherently determined by the JVMs available
memory. Yet, an IndexWriter
session can consume a significantly
larger amount of memory than the given RAM limit since this limit is just
an indicator when to flush memory resident documents to the Directory.
Flushes are likely happen concurrently while other threads adding documents
to the writer. For application stability the available memory in the JVM
should be significantly larger than the RAM buffer used for indexing.
NOTE: the account of RAM usage for pending deletions is only
approximate. Specifically, if you delete by Query, Lucene currently has no
way to measure the RAM usage of individual Queries so the accounting will
under-estimate and you should compensate by either calling commit()
periodically yourself, or by using LiveIndexWriterConfig.setMaxBufferedDeleteTerms(int)
to flush and apply buffered deletes by count instead of RAM usage (for each
buffered delete Query a constant number of bytes is used to estimate RAM
usage). Note that enabling LiveIndexWriterConfig.setMaxBufferedDeleteTerms(int)
will not
trigger any segment flushes.
NOTE: It's not guaranteed that all memory resident documents are
flushed once this limit is exceeded. Depending on the configured
FlushPolicy
only a subset of the buffered documents are flushed and
therefore only parts of the RAM buffer is released.
The default value is DEFAULT_RAM_BUFFER_SIZE_MB
.
Takes effect immediately, but only the next time a document is added, updated or deleted.
setRAMBufferSizeMB
in class LiveIndexWriterConfig
setRAMPerThreadHardLimitMB(int)
public IndexWriterConfig setUseCompoundFile(boolean useCompoundFile)
LiveIndexWriterConfig
IndexWriter
should pack newly written segments in a
compound file. Default is true
.
Use false
for batch indexing with very large ram buffer
settings.
Note: To control compound file usage during segment merges see
MergePolicy.setNoCFSRatio(double)
and
MergePolicy.setMaxCFSSegmentSizeMB(double)
. This setting only
applies to newly created segments.
setUseCompoundFile
in class LiveIndexWriterConfig
public IndexWriterConfig setCommitOnClose(boolean commitOnClose)
IndexWriter.close()
should first commit
before closing. Use true
to match behavior of Lucene 4.x.public String toString()
toString
in class LiveIndexWriterConfig
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