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LUCENE-1282: added workaround for nasty JRE bug that strikes when merging very large segments; also added safety to abort the merge (preventing index corruption) if we detect the bug has struck 

git-svn-id: https://svn.apache.org/repos/asf/lucene/java/trunk@658902 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Michael McCandless 2008-05-21 22:14:16 +00:00
parent 4eb8692588
commit 2175d84d64
1 changed files with 23 additions and 5 deletions
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28
src/java/org/apache/lucene/index/SegmentMerger.java
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@ -23,6 +23,7 @@ import java.util.Collection;
import java.io.IOException;
import org.apache.lucene.document.FieldSelector;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.FieldSelectorResult;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.IndexOutput;
@ -341,7 +342,12 @@ final class SegmentMerger {
if (checkAbort != null)
checkAbort.work(300*numDocs);
} else {
fieldsWriter.addDocument(reader.document(j, fieldSelectorMerge));
// NOTE: it's very important to first assign
// to doc then pass it to
// termVectorsWriter.addAllDocVectors; see
// LUCENE-1282
Document doc = reader.document(j, fieldSelectorMerge);
fieldsWriter.addDocument(doc);
j++;
docCount++;
if (checkAbort != null)
@ -358,7 +364,7 @@ final class SegmentMerger {
final long fdxFileLength = directory.fileLength(segment + "." + IndexFileNames.FIELDS_INDEX_EXTENSION);
if (4+docCount*8 != fdxFileLength)
// This is most like a bug in Sun JRE 1.6.0_04/_05;
// This is most likely a bug in Sun JRE 1.6.0_04/_05;
// we detect that the bug has struck, here, and
// throw an exception to prevent the corruption from
// entering the index. See LUCENE-1282 for
@ -431,7 +437,12 @@ final class SegmentMerger {
if (checkAbort != null)
checkAbort.work(300*numDocs);
} else {
termVectorsWriter.addAllDocVectors(reader.getTermFreqVectors(docNum));
// NOTE: it's very important to first assign
// to vectors then pass it to
// termVectorsWriter.addAllDocVectors; see
// LUCENE-1282
TermFreqVector[] vectors = reader.getTermFreqVectors(docNum);
termVectorsWriter.addAllDocVectors(vectors);
docNum++;
if (checkAbort != null)
checkAbort.work(300);
@ -444,8 +455,15 @@ final class SegmentMerger {
termVectorsWriter.close();
}
assert 4+mergedDocs*16 == directory.fileLength(segment + "." + IndexFileNames.VECTORS_INDEX_EXTENSION) :
"after mergeVectors: tvx size mismatch: " + mergedDocs + " docs vs " + directory.fileLength(segment + "." + IndexFileNames.VECTORS_INDEX_EXTENSION) + " length in bytes of " + segment + "." + IndexFileNames.VECTORS_INDEX_EXTENSION;
final long tvxSize = directory.fileLength(segment + "." + IndexFileNames.VECTORS_INDEX_EXTENSION);
if (4+mergedDocs*16 != tvxSize)
// This is most likely a bug in Sun JRE 1.6.0_04/_05;
// we detect that the bug has struck, here, and
// throw an exception to prevent the corruption from
// entering the index. See LUCENE-1282 for
// details.
throw new RuntimeException("mergeVectors produced an invalid result: mergedDocs is " + mergedDocs + " but tvx size is " + tvxSize + "; now aborting this merge to prevent index corruption");
}
private IndexOutput freqOutput = null;