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LUCENE-4055: use a codec header for the upgraded 3.x SI 

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/lucene4055@1342262 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Robert Muir 2012-05-24 13:43:43 +00:00
parent ba7f596a67
commit f7210b2481
4 changed files with 15 additions and 16 deletions
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9
lucene/core/src/java/org/apache/lucene/codecs/lucene3x/Lucene3xSegmentInfoFormat.java
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@ -42,13 +42,12 @@ public class Lucene3xSegmentInfoFormat extends SegmentInfoFormat {
/** Each segment records the Lucene version that created it. */
public static final int FORMAT_3_1 = -11;
/** Each segment records whether its postings are written
* in the new flex format */
public static final int FORMAT_4X_UPGRADE = -12;
/** Extension used for saving each SegmentInfo, once a 3.x
* index is first committed to with 4.0. */
public static final String SI_EXTENSION = "si";
public static final String UPGRADED_SI_EXTENSION = "si";
public static final String UPGRADED_SI_CODEC_NAME = "Lucene3xSegmentInfo";
public static final int UPGRADED_SI_VERSION_START = 0;
public static final int UPGRADED_SI_VERSION_CURRENT = UPGRADED_SI_VERSION_START;
@Override
public SegmentInfoReader getSegmentInfosReader() {

13
lucene/core/src/java/org/apache/lucene/codecs/lucene3x/Lucene3xSegmentInfoReader.java
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@ -35,6 +35,7 @@ import org.apache.lucene.store.CompoundFileDirectory;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.IOContext;
import org.apache.lucene.store.IndexInput;
import org.apache.lucene.util.CodecUtil;
import org.apache.lucene.util.IOUtils;
/**
@ -95,14 +96,13 @@ public class Lucene3xSegmentInfoReader extends SegmentInfoReader {
@Override
public SegmentInfo read(Directory directory, String segmentName, IOContext context) throws IOException {
// NOTE: this is NOT how 3.x is really written...
String fileName = IndexFileNames.segmentFileName(segmentName, "", Lucene3xSegmentInfoFormat.SI_EXTENSION);
String fileName = IndexFileNames.segmentFileName(segmentName, "", Lucene3xSegmentInfoFormat.UPGRADED_SI_EXTENSION);
boolean success = false;
IndexInput input = directory.openInput(fileName, context);
try {
// nocommit: we need a version header
SegmentInfo si = readUpgradedSegmentInfo(segmentName, directory, input);
success = true;
return si;
@ -124,14 +124,13 @@ public class Lucene3xSegmentInfoReader extends SegmentInfoReader {
/** reads from legacy 3.x segments_N */
private SegmentInfoPerCommit readLegacySegmentInfo(Directory dir, int format, IndexInput input) throws IOException {
// check that it is a format we can understand
assert format != Lucene3xSegmentInfoFormat.FORMAT_4X_UPGRADE;
if (format > Lucene3xSegmentInfoFormat.FORMAT_DIAGNOSTICS) {
throw new IndexFormatTooOldException(input, format,
Lucene3xSegmentInfoFormat.FORMAT_DIAGNOSTICS, Lucene3xSegmentInfoFormat.FORMAT_4X_UPGRADE);
Lucene3xSegmentInfoFormat.FORMAT_DIAGNOSTICS, Lucene3xSegmentInfoFormat.FORMAT_3_1);
}
if (format < Lucene3xSegmentInfoFormat.FORMAT_3_1) {
throw new IndexFormatTooNewException(input, format,
Lucene3xSegmentInfoFormat.FORMAT_DIAGNOSTICS, Lucene3xSegmentInfoFormat.FORMAT_4X_UPGRADE);
Lucene3xSegmentInfoFormat.FORMAT_DIAGNOSTICS, Lucene3xSegmentInfoFormat.FORMAT_3_1);
}
final String version;
if (format <= Lucene3xSegmentInfoFormat.FORMAT_3_1) {
@ -248,7 +247,9 @@ public class Lucene3xSegmentInfoReader extends SegmentInfoReader {
}
private SegmentInfo readUpgradedSegmentInfo(String name, Directory dir, IndexInput input) throws IOException {
CodecUtil.checkHeader(input, Lucene3xSegmentInfoFormat.UPGRADED_SI_CODEC_NAME,
Lucene3xSegmentInfoFormat.UPGRADED_SI_VERSION_START,
Lucene3xSegmentInfoFormat.UPGRADED_SI_VERSION_CURRENT);
final String version = input.readString();
final int docCount = input.readInt();

3
lucene/core/src/java/org/apache/lucene/index/IndexWriter.java
View File

@ -2371,9 +2371,6 @@ public class IndexWriter implements Closeable, TwoPhaseCommit {
Set<String> codecDocStoreFiles = new HashSet<String>();
final boolean hasSharedDocStore = Lucene3xSegmentInfoFormat.getDocStoreOffset(info.info) != -1;
final String segmentInfoFileName3X = IndexFileNames.segmentFileName(info.info.name,
"",
Lucene3xSegmentInfoFormat.SI_EXTENSION);
// copy the attributes map, we modify it for the preflex case
final Map<String,String> attributes;

6
lucene/core/src/java/org/apache/lucene/index/SegmentInfos.java
View File

@ -373,7 +373,7 @@ public final class SegmentInfos implements Cloneable, Iterable<SegmentInfoPerCom
// "ugprade" to write the .si file for it:
String version = si.getVersion();
if (version == null || StringHelper.getVersionComparator().compare(version, "4.0") < 0) {
String fileName = IndexFileNames.segmentFileName(si.name, "", Lucene3xSegmentInfoFormat.SI_EXTENSION);
String fileName = IndexFileNames.segmentFileName(si.name, "", Lucene3xSegmentInfoFormat.UPGRADED_SI_EXTENSION);
if (!directory.fileExists(fileName)) {
upgradedSIFiles.add(write3xInfo(directory, si, IOContext.DEFAULT));
}
@ -411,7 +411,7 @@ public final class SegmentInfos implements Cloneable, Iterable<SegmentInfoPerCom
public static String write3xInfo(Directory dir, SegmentInfo si, IOContext context) throws IOException {
// NOTE: this is NOT how 3.x is really written...
String fileName = IndexFileNames.segmentFileName(si.name, "", Lucene3xSegmentInfoFormat.SI_EXTENSION);
String fileName = IndexFileNames.segmentFileName(si.name, "", Lucene3xSegmentInfoFormat.UPGRADED_SI_EXTENSION);
si.addFile(fileName);
//System.out.println("UPGRADE write " + fileName);
@ -421,6 +421,8 @@ public final class SegmentInfos implements Cloneable, Iterable<SegmentInfoPerCom
// we are about to write this SI in 3.x format, dropping all codec information, etc.
// so it had better be a 3.x segment or you will get very confusing errors later.
assert si.getCodec() instanceof Lucene3xCodec : "broken test, trying to mix preflex with other codecs";
CodecUtil.writeHeader(output, Lucene3xSegmentInfoFormat.UPGRADED_SI_CODEC_NAME,
Lucene3xSegmentInfoFormat.UPGRADED_SI_VERSION_CURRENT);
// Write the Lucene version that created this segment, since 3.1
output.writeString(si.getVersion());
output.writeInt(si.getDocCount());