private void DeleteReaderReaderConflict(bool optimize)
{
Directory dir = GetDirectory();
Term searchTerm1 = new Term("content", "aaa");
Term searchTerm2 = new Term("content", "bbb");
Term searchTerm3 = new Term("content", "ccc");
// add 100 documents with term : aaa
// add 100 documents with term : bbb
// add 100 documents with term : ccc
IndexWriter writer = new IndexWriter(dir, new WhitespaceAnalyzer(), true, IndexWriter.MaxFieldLength.LIMITED);
for (int i = 0; i < 100; i++)
{
AddDoc(writer, searchTerm1.Text);
AddDoc(writer, searchTerm2.Text);
AddDoc(writer, searchTerm3.Text);
}
if (optimize)
writer.Optimize();
writer.Close();
// OPEN TWO READERS
// Both readers get segment info as exists at this time
IndexReader reader1 = IndexReader.Open(dir, false);
Assert.AreEqual(100, reader1.DocFreq(searchTerm1), "first opened");
Assert.AreEqual(100, reader1.DocFreq(searchTerm2), "first opened");
Assert.AreEqual(100, reader1.DocFreq(searchTerm3), "first opened");
AssertTermDocsCount("first opened", reader1, searchTerm1, 100);
AssertTermDocsCount("first opened", reader1, searchTerm2, 100);
AssertTermDocsCount("first opened", reader1, searchTerm3, 100);
IndexReader reader2 = IndexReader.Open(dir, false);
Assert.AreEqual(100, reader2.DocFreq(searchTerm1), "first opened");
Assert.AreEqual(100, reader2.DocFreq(searchTerm2), "first opened");
Assert.AreEqual(100, reader2.DocFreq(searchTerm3), "first opened");
AssertTermDocsCount("first opened", reader2, searchTerm1, 100);
AssertTermDocsCount("first opened", reader2, searchTerm2, 100);
AssertTermDocsCount("first opened", reader2, searchTerm3, 100);
// DELETE DOCS FROM READER 2 and CLOSE IT
// delete documents containing term: aaa
// when the reader is closed, the segment info is updated and
// the first reader is now stale
reader2.DeleteDocuments(searchTerm1);
Assert.AreEqual(100, reader2.DocFreq(searchTerm1), "after delete 1");
Assert.AreEqual(100, reader2.DocFreq(searchTerm2), "after delete 1");
Assert.AreEqual(100, reader2.DocFreq(searchTerm3), "after delete 1");
AssertTermDocsCount("after delete 1", reader2, searchTerm1, 0);
AssertTermDocsCount("after delete 1", reader2, searchTerm2, 100);
AssertTermDocsCount("after delete 1", reader2, searchTerm3, 100);
reader2.Close();
// Make sure reader 1 is unchanged since it was open earlier
Assert.AreEqual(100, reader1.DocFreq(searchTerm1), "after delete 1");
Assert.AreEqual(100, reader1.DocFreq(searchTerm2), "after delete 1");
Assert.AreEqual(100, reader1.DocFreq(searchTerm3), "after delete 1");
AssertTermDocsCount("after delete 1", reader1, searchTerm1, 100);
AssertTermDocsCount("after delete 1", reader1, searchTerm2, 100);
AssertTermDocsCount("after delete 1", reader1, searchTerm3, 100);
// ATTEMPT TO DELETE FROM STALE READER
// delete documents containing term: bbb
Assert.Throws<StaleReaderException>(() => reader1.DeleteDocuments(searchTerm2),
"Delete allowed from a stale index reader");
// RECREATE READER AND TRY AGAIN
reader1.Close();
reader1 = IndexReader.Open(dir, false);
Assert.AreEqual(100, reader1.DocFreq(searchTerm1), "reopened");
Assert.AreEqual(100, reader1.DocFreq(searchTerm2), "reopened");
Assert.AreEqual(100, reader1.DocFreq(searchTerm3), "reopened");
AssertTermDocsCount("reopened", reader1, searchTerm1, 0);
AssertTermDocsCount("reopened", reader1, searchTerm2, 100);
AssertTermDocsCount("reopened", reader1, searchTerm3, 100);
reader1.DeleteDocuments(searchTerm2);
Assert.AreEqual(100, reader1.DocFreq(searchTerm1), "deleted 2");
Assert.AreEqual(100, reader1.DocFreq(searchTerm2), "deleted 2");
Assert.AreEqual(100, reader1.DocFreq(searchTerm3), "deleted 2");
AssertTermDocsCount("deleted 2", reader1, searchTerm1, 0);
AssertTermDocsCount("deleted 2", reader1, searchTerm2, 0);
AssertTermDocsCount("deleted 2", reader1, searchTerm3, 100);
reader1.Close();
// Open another reader to confirm that everything is deleted
reader2 = IndexReader.Open(dir, false);
Assert.AreEqual(100, reader2.DocFreq(searchTerm1), "reopened 2");
Assert.AreEqual(100, reader2.DocFreq(searchTerm2), "reopened 2");
Assert.AreEqual(100, reader2.DocFreq(searchTerm3), "reopened 2");
AssertTermDocsCount("reopened 2", reader2, searchTerm1, 0);
AssertTermDocsCount("reopened 2", reader2, searchTerm2, 0);
AssertTermDocsCount("reopened 2", reader2, searchTerm3, 100);
reader2.Close();
dir.Close();
}
