private void verifyCommitOrder(List<? extends IndexCommit> commits) {
if (commits.isEmpty()) {
return;
}
final IndexCommit firstCommit = commits.get(0);
long last = SegmentInfos.generationFromSegmentsFileName(firstCommit.getSegmentsFileName());
assertEquals(last, firstCommit.getGeneration());
for (int i = 1; i < commits.size(); i++) {
final IndexCommit commit = commits.get(i);
long now = SegmentInfos.generationFromSegmentsFileName(commit.getSegmentsFileName());
assertTrue("SegmentInfos commits are out-of-order", now > last);
assertEquals(now, commit.getGeneration());
last = now;
}
}
/* Uses KeepAllDeletionPolicy to keep all commits around,
* then, opens a new IndexWriter on a previous commit
* point. */
public void testOpenPriorSnapshot() throws IOException {
Directory dir = newDirectory();
IndexWriter writer =
new IndexWriter(
dir,
newIndexWriterConfig(new MockAnalyzer(random()))
.setIndexDeletionPolicy(new KeepAllDeletionPolicy(dir))
.setMaxBufferedDocs(2)
.setMergePolicy(newLogMergePolicy(10)));
KeepAllDeletionPolicy policy =
(KeepAllDeletionPolicy) writer.getConfig().getIndexDeletionPolicy();
for (int i = 0; i < 10; i++) {
addDoc(writer);
if ((1 + i) % 2 == 0) writer.commit();
}
writer.close();
Collection<IndexCommit> commits = DirectoryReader.listCommits(dir);
assertEquals(5, commits.size());
IndexCommit lastCommit = null;
for (final IndexCommit commit : commits) {
if (lastCommit == null || commit.getGeneration() > lastCommit.getGeneration())
lastCommit = commit;
}
assertTrue(lastCommit != null);
// Now add 1 doc and merge
writer =
new IndexWriter(
dir, newIndexWriterConfig(new MockAnalyzer(random())).setIndexDeletionPolicy(policy));
addDoc(writer);
assertEquals(11, writer.numDocs());
writer.forceMerge(1);
writer.close();
assertEquals(6, DirectoryReader.listCommits(dir).size());
// Now open writer on the commit just before merge:
writer =
new IndexWriter(
dir,
newIndexWriterConfig(new MockAnalyzer(random()))
.setIndexDeletionPolicy(policy)
.setIndexCommit(lastCommit));
assertEquals(10, writer.numDocs());
// Should undo our rollback:
writer.rollback();
DirectoryReader r = DirectoryReader.open(dir);
// Still merged, still 11 docs
assertEquals(1, r.leaves().size());
assertEquals(11, r.numDocs());
r.close();
writer =
new IndexWriter(
dir,
newIndexWriterConfig(new MockAnalyzer(random()))
.setIndexDeletionPolicy(policy)
.setIndexCommit(lastCommit));
assertEquals(10, writer.numDocs());
// Commits the rollback:
writer.close();
// Now 8 because we made another commit
assertEquals(7, DirectoryReader.listCommits(dir).size());
r = DirectoryReader.open(dir);
// Not fully merged because we rolled it back, and now only
// 10 docs
assertTrue(r.leaves().size() > 1);
assertEquals(10, r.numDocs());
r.close();
// Re-merge
writer =
new IndexWriter(
dir, newIndexWriterConfig(new MockAnalyzer(random())).setIndexDeletionPolicy(policy));
writer.forceMerge(1);
writer.close();
r = DirectoryReader.open(dir);
assertEquals(1, r.leaves().size());
assertEquals(10, r.numDocs());
r.close();
// Now open writer on the commit just before merging,
// but this time keeping only the last commit:
writer =
new IndexWriter(
dir, newIndexWriterConfig(new MockAnalyzer(random())).setIndexCommit(lastCommit));
assertEquals(10, writer.numDocs());
// Reader still sees fully merged index, because writer
// opened on the prior commit has not yet committed:
r = DirectoryReader.open(dir);
assertEquals(1, r.leaves().size());
assertEquals(10, r.numDocs());
r.close();
writer.close();
// Now reader sees not-fully-merged index:
r = DirectoryReader.open(dir);
assertTrue(r.leaves().size() > 1);
assertEquals(10, r.numDocs());
r.close();
dir.close();
}
@Override
public long getGeneration() {
return cp.getGeneration();
}