Package org.apache.lucene.index

Class CheckIndex

java.lang.Object

org.apache.lucene.index.CheckIndex

All Implemented Interfaces:

Closeable, AutoCloseable

public final class CheckIndex
extends Object
implements Closeable

Basic tool and API to check the health of an index and write a new segments file that removes reference to problematic segments.

As this tool checks every byte in the index, on a large index it can take quite a long time to run.

WARNING: This API is experimental and might change in incompatible ways in the next release.

Please make a complete backup of your index before using this to exorcise corrupted documents from your index!

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	CheckIndex.CheckIndexException	The marker RuntimeException used by CheckIndex APIs when index integrity failure is detected.
static class	CheckIndex.Level	Class with static variables with information about CheckIndex's -level parameter.
static class	CheckIndex.Options	Run-time configuration options for CheckIndex commands.
static class	CheckIndex.Status	Returned from checkIndex() detailing the health and status of the index.
static class	CheckIndex.VerifyPointsVisitor	Walks the entire N-dimensional points space, verifying that all points fall within the last cell's boundaries.

Constructor Summary

Constructors

Constructor	Description
CheckIndex(Directory dir)	Create a new CheckIndex on the directory.
CheckIndex(Directory dir, Lock writeLock)	Expert: create a directory with the specified lock.

Method Summary

Modifier and Type	Method	Description
static boolean	assertsOn()	Check whether asserts are enabled or not.
CheckIndex.Status	checkIndex()	Returns a CheckIndex.Status instance detailing the state of the index.
CheckIndex.Status	checkIndex(List<String> onlySegments)	Returns a CheckIndex.Status instance detailing the state of the index.
CheckIndex.Status	checkIndex(List<String> onlySegments, ExecutorService executorService)	Returns a CheckIndex.Status instance detailing the state of the index.
void	close()
int	doCheck(CheckIndex.Options opts)	Actually perform the index check
void	exorciseIndex(CheckIndex.Status result)	Repairs the index using previously returned result from checkIndex().
boolean	getFailFast()	See setFailFast(boolean).
int	getLevel()	See setLevel(int).
static void	main(String[] args)	Command-line interface to check and exorcise corrupt segments from an index.
static CheckIndex.Options	parseOptions(String[] args)	Parse command line args into fields
void	setFailFast(boolean v)	If true, just throw the original exception immediately when corruption is detected, rather than continuing to iterate to other segments looking for more corruption.
void	setInfoStream(PrintStream out)	Set infoStream where messages should go.
void	setInfoStream(PrintStream out, boolean verbose)	Set infoStream where messages should go.
void	setLevel(int v)	Sets Level, the higher the value, the more additional checks are performed.
void	setThreadCount(int tc)	Set threadCount used for parallelizing index integrity checking.
static CheckIndex.Status.DocValuesStatus	testDocValues(CodecReader reader, PrintStream infoStream, boolean failFast)	Test docvalues.
static CheckIndex.Status.FieldInfoStatus	testFieldInfos(CodecReader reader, PrintStream infoStream, boolean failFast)	Test field infos.
static CheckIndex.Status.FieldNormStatus	testFieldNorms(CodecReader reader, PrintStream infoStream, boolean failFast)	Test field norms.
static CheckIndex.Status.LiveDocStatus	testLiveDocs(CodecReader reader, PrintStream infoStream, boolean failFast)	Test live docs.
static CheckIndex.Status.PointsStatus	testPoints(CodecReader reader, PrintStream infoStream, boolean failFast)	Test the points index.
static CheckIndex.Status.TermIndexStatus	testPostings(CodecReader reader, PrintStream infoStream)	Test the term index.
static CheckIndex.Status.TermIndexStatus	testPostings(CodecReader reader, PrintStream infoStream, boolean verbose, int level, boolean failFast)	Test the term index.
static CheckIndex.Status.IndexSortStatus	testSort(CodecReader reader, Sort sort, PrintStream infoStream, boolean failFast)	Tests index sort order.
static CheckIndex.Status.StoredFieldStatus	testStoredFields(CodecReader reader, PrintStream infoStream, boolean failFast)	Test stored fields.
static CheckIndex.Status.TermVectorStatus	testTermVectors(CodecReader reader, PrintStream infoStream)	Test term vectors.
static CheckIndex.Status.TermVectorStatus	testTermVectors(CodecReader reader, PrintStream infoStream, boolean verbose, int level, boolean failFast)	Test term vectors.
static CheckIndex.Status.VectorValuesStatus	testVectors(CodecReader reader, PrintStream infoStream, boolean failFast)	Test the vectors index.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

CheckIndex

public CheckIndex(Directory dir)
           throws IOException

Create a new CheckIndex on the directory.

Throws:

IOException

CheckIndex

public CheckIndex(Directory dir,
 Lock writeLock)

Expert: create a directory with the specified lock. This should really not be used except for unit tests!!!! It exists only to support special tests (such as TestIndexWriterExceptions*), that would otherwise be more complicated to debug if they had to close the writer for each check.

Method Details

close

public void close()
           throws IOException

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Throws:

IOException

setLevel

public void setLevel(int v)

Sets Level, the higher the value, the more additional checks are performed. This will likely drastically increase time it takes to run CheckIndex! See CheckIndex.Level

getLevel

public int getLevel()

See setLevel(int).

setFailFast

public void setFailFast(boolean v)

If true, just throw the original exception immediately when corruption is detected, rather than continuing to iterate to other segments looking for more corruption.

getFailFast

public boolean getFailFast()

See setFailFast(boolean).

setThreadCount

public void setThreadCount(int tc)

Set threadCount used for parallelizing index integrity checking.

setInfoStream

public void setInfoStream(PrintStream out,
 boolean verbose)

Set infoStream where messages should go. If null, no messages are printed. If verbose is true then more details are printed.

setInfoStream

public void setInfoStream(PrintStream out)

Set infoStream where messages should go. See setInfoStream(PrintStream,boolean).

checkIndex

public CheckIndex.Status checkIndex()
                             throws IOException

Returns a CheckIndex.Status instance detailing the state of the index.

As this method checks every byte in the index, on a large index it can take quite a long time to run.

WARNING: make sure you only call this when the index is not opened by any writer.

Throws:

IOException

checkIndex

public CheckIndex.Status checkIndex(List<String> onlySegments)
                             throws IOException

Returns a CheckIndex.Status instance detailing the state of the index.

Parameters:

onlySegments - list of specific segment names to check

As this method checks every byte in the specified segments, on a large index it can take quite a long time to run.

Throws:

IOException

checkIndex

public CheckIndex.Status checkIndex(List<String> onlySegments,
 ExecutorService executorService)
                             throws IOException

Returns a CheckIndex.Status instance detailing the state of the index.

This method allows caller to pass in customized ExecutorService to speed up the check.

WARNING: make sure you only call this when the index is not opened by any writer.

Throws:

IOException

testSort

public static CheckIndex.Status.IndexSortStatus testSort(CodecReader reader,
 Sort sort,
 PrintStream infoStream,
 boolean failFast)
                                                  throws IOException

Tests index sort order.

Throws:

IOException

testLiveDocs

public static CheckIndex.Status.LiveDocStatus testLiveDocs(CodecReader reader,
 PrintStream infoStream,
 boolean failFast)
                                                    throws IOException

Test live docs.

Throws:

IOException

testFieldInfos

public static CheckIndex.Status.FieldInfoStatus testFieldInfos(CodecReader reader,
 PrintStream infoStream,
 boolean failFast)
                                                        throws IOException

Test field infos.

Throws:

IOException

testFieldNorms

public static CheckIndex.Status.FieldNormStatus testFieldNorms(CodecReader reader,
 PrintStream infoStream,
 boolean failFast)
                                                        throws IOException

Test field norms.

Throws:

IOException

testPostings

public static CheckIndex.Status.TermIndexStatus testPostings(CodecReader reader,
 PrintStream infoStream)
                                                      throws IOException

Test the term index.

Throws:

IOException

testPostings

public static CheckIndex.Status.TermIndexStatus testPostings(CodecReader reader,
 PrintStream infoStream,
 boolean verbose,
 int level,
 boolean failFast)
                                                      throws IOException

Test the term index.

Throws:

IOException

testPoints

public static CheckIndex.Status.PointsStatus testPoints(CodecReader reader,
 PrintStream infoStream,
 boolean failFast)
                                                 throws IOException

Test the points index.

Throws:

IOException

testVectors

public static CheckIndex.Status.VectorValuesStatus testVectors(CodecReader reader,
 PrintStream infoStream,
 boolean failFast)
                                                        throws IOException

Test the vectors index.

Throws:

IOException

testStoredFields

public static CheckIndex.Status.StoredFieldStatus testStoredFields(CodecReader reader,
 PrintStream infoStream,
 boolean failFast)
                                                            throws IOException

Test stored fields.

Throws:

IOException

testDocValues

public static CheckIndex.Status.DocValuesStatus testDocValues(CodecReader reader,
 PrintStream infoStream,
 boolean failFast)
                                                       throws IOException

Test docvalues.

Throws:

IOException

testTermVectors

public static CheckIndex.Status.TermVectorStatus testTermVectors(CodecReader reader,
 PrintStream infoStream)
                                                          throws IOException

Test term vectors.

Throws:

IOException

testTermVectors

public static CheckIndex.Status.TermVectorStatus testTermVectors(CodecReader reader,
 PrintStream infoStream,
 boolean verbose,
 int level,
 boolean failFast)
                                                          throws IOException

Test term vectors.

Throws:

IOException

exorciseIndex

public void exorciseIndex(CheckIndex.Status result)
                   throws IOException

Repairs the index using previously returned result from checkIndex(). Note that this does not remove any of the unreferenced files after it's done; you must separately open an IndexWriter, which deletes unreferenced files when it's created.

WARNING: this writes a new segments file into the index, effectively removing all documents in broken segments from the index. BE CAREFUL.

Throws:

IOException

assertsOn

public static boolean assertsOn()

Check whether asserts are enabled or not.

Returns:

true iff asserts are enabled

main

public static void main(String[] args)
                 throws IOException,
InterruptedException

Command-line interface to check and exorcise corrupt segments from an index.

Run it like this:

 java -ea:org.apache.lucene... org.apache.lucene.index.CheckIndex pathToIndex [-exorcise] [-verbose] [-segment X] [-segment Y]
 

• -exorcise: actually write a new segments_N file, removing any problematic segments. *LOSES DATA*
• -segment X: only check the specified segment(s). This can be specified multiple times, to check more than one segment: -segment _2 * -segment _a. You can't use this with the -exorcise option.

WARNING: -exorcise should only be used on an emergency basis as it will cause documents (perhaps many) to be permanently removed from the index. Always make a backup copy of your index before running this! Do not run this tool on an index that is actively being written to. You have been warned!

Run without -exorcise, this tool will open the index, report version information and report any exceptions it hits and what action it would take if -exorcise were specified. With -exorcise, this tool will remove any segments that have issues and write a new segments_N file. This means all documents contained in the affected segments will be removed.

This tool exits with exit code 1 if the index cannot be opened or has any corruption, else 0.

Throws:

IOException

InterruptedException

parseOptions

public static CheckIndex.Options parseOptions(String[] args)

Parse command line args into fields

Parameters:

args - The command line arguments

Returns:

An Options struct

Throws:

IllegalArgumentException - if any of the CLI args are invalid

doCheck

public int doCheck(CheckIndex.Options opts)
            throws IOException,
InterruptedException

Actually perform the index check

Parameters:

opts - The options to use for this check

Returns:

0 iff the index is clean, 1 otherwise

Throws:

IOException

InterruptedException