package org.apache.lucene.index;
import java.io.IOException;
import java.util.Arrays;
import junit.framework.TestCase;
import org.apache.lucene.analysis.WhitespaceAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.search.Hits;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.MockRAMDirectory;
import org.apache.lucene.store.RAMDirectory;
public class TestIndexWriterDelete extends TestCase {
// test the simple case
public void testSimpleCase() throws IOException {
String[] keywords = { "1", "2" };
String[] unindexed = { "Netherlands", "Italy" };
String[] unstored = { "Amsterdam has lots of bridges",
"Venice has lots of canals" };
String[] text = { "Amsterdam", "Venice" };
Directory dir = new RAMDirectory();
IndexWriter modifier = new IndexWriter(dir,
new WhitespaceAnalyzer(), true);
modifier.setUseCompoundFile(true);
modifier.setMaxBufferedDeleteTerms(1);
for (int i = 0; i < keywords.length; i++) {
Document doc = new Document();
doc.add(new Field("id", keywords[i], Field.Store.YES,
Field.Index.UN_TOKENIZED));
doc.add(new Field("country", unindexed[i], Field.Store.YES,
Field.Index.NO));
doc.add(new Field("contents", unstored[i], Field.Store.NO,
Field.Index.TOKENIZED));
doc
.add(new Field("city", text[i], Field.Store.YES,
Field.Index.TOKENIZED));
modifier.addDocument(doc);
}
modifier.optimize();
Term term = new Term("city", "Amsterdam");
int hitCount = getHitCount(dir, term);
assertEquals(1, hitCount);
modifier.deleteDocuments(term);
hitCount = getHitCount(dir, term);
assertEquals(0, hitCount);
modifier.close();
}
// test when delete terms only apply to disk segments
public void testNonRAMDelete() throws IOException {
Directory dir = new RAMDirectory();
IndexWriter modifier = new IndexWriter(dir,
new WhitespaceAnalyzer(), true);
modifier.setMaxBufferedDocs(2);
modifier.setMaxBufferedDeleteTerms(2);
int id = 0;
int value = 100;
for (int i = 0; i < 7; i++) {
addDoc(modifier, ++id, value);
}
modifier.flush();
assertEquals(0, modifier.getRamSegmentCount());
assertTrue(0 < modifier.getSegmentCount());
IndexReader reader = IndexReader.open(dir);
assertEquals(7, reader.numDocs());
reader.close();
modifier.deleteDocuments(new Term("value", String.valueOf(value)));
modifier.deleteDocuments(new Term("value", String.valueOf(value)));
reader = IndexReader.open(dir);
assertEquals(0, reader.numDocs());
reader.close();
modifier.close();
}
// test when delete terms only apply to ram segments
public void testRAMDeletes() throws IOException {
Directory dir = new RAMDirectory();
IndexWriter modifier = new IndexWriter(dir,
new WhitespaceAnalyzer(), true);
modifier.setMaxBufferedDocs(4);
modifier.setMaxBufferedDeleteTerms(4);
int id = 0;
int value = 100;
addDoc(modifier, ++id, value);
modifier.deleteDocuments(new Term("value", String.valueOf(value)));
addDoc(modifier, ++id, value);
modifier.deleteDocuments(new Term("value", String.valueOf(value)));
assertEquals(2, modifier.getNumBufferedDeleteTerms());
assertEquals(1, modifier.getBufferedDeleteTermsSize());
addDoc(modifier, ++id, value);
assertEquals(0, modifier.getSegmentCount());
modifier.flush();
IndexReader reader = IndexReader.open(dir);
assertEquals(1, reader.numDocs());
int hitCount = getHitCount(dir, new Term("id", String.valueOf(id)));
assertEquals(1, hitCount);
reader.close();
modifier.close();
}
// test when delete terms apply to both disk and ram segments
public void testBothDeletes() throws IOException {
Directory dir = new RAMDirectory();
IndexWriter modifier = new IndexWriter(dir,
new WhitespaceAnalyzer(), true);
modifier.setMaxBufferedDocs(100);
modifier.setMaxBufferedDeleteTerms(100);
int id = 0;
int value = 100;
for (int i = 0; i < 5; i++) {
addDoc(modifier, ++id, value);
}
value = 200;
for (int i = 0; i < 5; i++) {
addDoc(modifier, ++id, value);
}
modifier.flush();
for (int i = 0; i < 5; i++) {
addDoc(modifier, ++id, value);
}
modifier.deleteDocuments(new Term("value", String.valueOf(value)));
modifier.flush();
IndexReader reader = IndexReader.open(dir);
assertEquals(5, reader.numDocs());
modifier.close();
}
// test that batched delete terms are flushed together
public void testBatchDeletes() throws IOException {
Directory dir = new RAMDirectory();
IndexWriter modifier = new IndexWriter(dir,
new WhitespaceAnalyzer(), true);
modifier.setMaxBufferedDocs(2);
modifier.setMaxBufferedDeleteTerms(2);
int id = 0;
int value = 100;
for (int i = 0; i < 7; i++) {
addDoc(modifier, ++id, value);
}
modifier.flush();
IndexReader reader = IndexReader.open(dir);
assertEquals(7, reader.numDocs());
reader.close();
id = 0;
modifier.deleteDocuments(new Term("id", String.valueOf(++id)));
modifier.deleteDocuments(new Term("id", String.valueOf(++id)));
reader = IndexReader.open(dir);
assertEquals(5, reader.numDocs());
reader.close();
Term[] terms = new Term[3];
for (int i = 0; i < terms.length; i++) {
terms[i] = new Term("id", String.valueOf(++id));
}
modifier.deleteDocuments(terms);
reader = IndexReader.open(dir);
assertEquals(2, reader.numDocs());
reader.close();
modifier.close();
}
private void addDoc(IndexWriter modifier, int id, int value)
throws IOException {
Document doc = new Document();
doc.add(new Field("content", "aaa", Field.Store.NO, Field.Index.TOKENIZED));
doc.add(new Field("id", String.valueOf(id), Field.Store.YES,
Field.Index.UN_TOKENIZED));
doc.add(new Field("value", String.valueOf(value), Field.Store.NO,
Field.Index.UN_TOKENIZED));
modifier.addDocument(doc);
}
private int getHitCount(Directory dir, Term term) throws IOException {
IndexSearcher searcher = new IndexSearcher(dir);
int hitCount = searcher.search(new TermQuery(term)).length();
searcher.close();
return hitCount;
}
public void testDeletesOnDiskFull() throws IOException {
testOperationsOnDiskFull(false);
}
public void testUpdatesOnDiskFull() throws IOException {
testOperationsOnDiskFull(true);
}
/**
* Make sure if modifier tries to commit but hits disk full that modifier
* remains consistent and usable. Similar to TestIndexReader.testDiskFull().
*/
private void testOperationsOnDiskFull(boolean updates) throws IOException {
boolean debug = false;
Term searchTerm = new Term("content", "aaa");
int START_COUNT = 157;
int END_COUNT = 144;
// First build up a starting index:
RAMDirectory startDir = new RAMDirectory();
IndexWriter writer = new IndexWriter(startDir, new WhitespaceAnalyzer(),
true);
for (int i = 0; i < 157; i++) {
Document d = new Document();
d.add(new Field("id", Integer.toString(i), Field.Store.YES,
Field.Index.UN_TOKENIZED));
d.add(new Field("content", "aaa " + i, Field.Store.NO,
Field.Index.TOKENIZED));
writer.addDocument(d);
}
writer.close();
long diskUsage = startDir.sizeInBytes();
long diskFree = diskUsage + 10;
IOException err = null;
boolean done = false;
// Iterate w/ ever increasing free disk space:
while (!done) {
MockRAMDirectory dir = new MockRAMDirectory(startDir);
IndexWriter modifier = new IndexWriter(dir,
new WhitespaceAnalyzer(), false);
modifier.setMaxBufferedDocs(1000); // use flush or close
modifier.setMaxBufferedDeleteTerms(1000); // use flush or close
// For each disk size, first try to commit against
// dir that will hit random IOExceptions & disk
// full; after, give it infinite disk space & turn
// off random IOExceptions & retry w/ same reader:
boolean success = false;
for (int x = 0; x < 2; x++) {
double rate = 0.1;
double diskRatio = ((double)diskFree) / diskUsage;
long thisDiskFree;
String testName;
if (0 == x) {
thisDiskFree = diskFree;
if (diskRatio >= 2.0) {
rate /= 2;
}
if (diskRatio >= 4.0) {
rate /= 2;
}
if (diskRatio >= 6.0) {
rate = 0.0;
}
if (debug) {
System.out.println("\ncycle: " + diskFree + " bytes");
}
testName = "disk full during reader.close() @ " + thisDiskFree
+ " bytes";
} else {
thisDiskFree = 0;
rate = 0.0;
if (debug) {
System.out.println("\ncycle: same writer: unlimited disk space");
}
testName = "reader re-use after disk full";
}
dir.setMaxSizeInBytes(thisDiskFree);
dir.setRandomIOExceptionRate(rate, diskFree);
try {
if (0 == x) {
int docId = 12;
for (int i = 0; i < 13; i++) {
if (updates) {
Document d = new Document();
d.add(new Field("id", Integer.toString(i), Field.Store.YES,
Field.Index.UN_TOKENIZED));
d.add(new Field("content", "bbb " + i, Field.Store.NO,
Field.Index.TOKENIZED));
modifier.updateDocument(new Term("id", Integer.toString(docId)), d);
} else { // deletes
modifier.deleteDocuments(new Term("id", Integer.toString(docId)));
// modifier.setNorm(docId, "contents", (float)2.0);
}
docId += 12;
}
}
modifier.close();
success = true;
if (0 == x) {
done = true;
}
}
catch (IOException e) {
if (debug) {
System.out.println(" hit IOException: " + e);
}
err = e;
if (1 == x) {
e.printStackTrace();
fail(testName + " hit IOException after disk space was freed up");
}
}
// Whether we succeeded or failed, check that all
// un-referenced files were in fact deleted (ie,
// we did not create garbage). Just create a
// new IndexFileDeleter, have it delete
// unreferenced files, then verify that in fact
// no files were deleted:
String[] startFiles = dir.list();
SegmentInfos infos = new SegmentInfos();
infos.read(dir);
IndexFileDeleter d = new IndexFileDeleter(infos, dir);
d.findDeletableFiles();
d.deleteFiles();
String[] endFiles = dir.list();
Arrays.sort(startFiles);
Arrays.sort(endFiles);
// for(int i=0;i<startFiles.length;i++) {
// System.out.println(" startFiles: " + i + ": " + startFiles[i]);
// }
if (!Arrays.equals(startFiles, endFiles)) {
String successStr;
if (success) {
successStr = "success";
} else {
successStr = "IOException";
err.printStackTrace();
}
fail("reader.close() failed to delete unreferenced files after "
+ successStr + " (" + diskFree + " bytes): before delete:\n "
+ arrayToString(startFiles) + "\n after delete:\n "
+ arrayToString(endFiles));
}
// Finally, verify index is not corrupt, and, if
// we succeeded, we see all docs changed, and if
// we failed, we see either all docs or no docs
// changed (transactional semantics):
IndexReader newReader = null;
try {
newReader = IndexReader.open(dir);
}
catch (IOException e) {
e.printStackTrace();
fail(testName
+ ":exception when creating IndexReader after disk full during close: "
+ e);
}
IndexSearcher searcher = new IndexSearcher(newReader);
Hits hits = null;
try {
hits = searcher.search(new TermQuery(searchTerm));
}
catch (IOException e) {
e.printStackTrace();
fail(testName + ": exception when searching: " + e);
}
int result2 = hits.length();
if (success) {
if (result2 != END_COUNT) {
fail(testName
+ ": method did not throw exception but hits.length for search on term 'aaa' is "
+ result2 + " instead of expected " + END_COUNT);
}
} else {
// On hitting exception we still may have added
// all docs:
if (result2 != START_COUNT && result2 != END_COUNT) {
err.printStackTrace();
fail(testName
+ ": method did throw exception but hits.length for search on term 'aaa' is "
+ result2 + " instead of expected " + START_COUNT);
}
}
searcher.close();
newReader.close();
if (result2 == END_COUNT) {
break;
}
}
dir.close();
// Try again with 10 more bytes of free space:
diskFree += 10;
}
}
private String arrayToString(String[] l) {
String s = "";
for (int i = 0; i < l.length; i++) {
if (i > 0) {
s += "\n ";
}
s += l[i];
}
return s;
}
}
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