gokaai commented on code in PR #12530:
URL: https://github.com/apache/lucene/pull/12530#discussion_r1388271749
##########
lucene/core/src/java/org/apache/lucene/index/CheckIndex.java:
##########
@@ -610,6 +610,31 @@ public Status checkIndex(List<String> onlySegments,
ExecutorService executorServ
return result;
}
+ // https://github.com/apache/lucene/issues/7820: also attempt to open any
older commit points (segments_N), which will catch certain
+ // corruption like missing _N.si files for segments not also referenced by
the newest commit point (which was already loaded,
Review Comment:
@mikemccand Just to clarify this comment - I was using @buzztaiki 's
[original test
case](https://github.com/apache/lucene/issues/7009#issuecomment-1223544484)
with slight modifications to test this:
```java
package org.apache.lucene.index;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field.Store;
import org.apache.lucene.document.IntField;
import org.apache.lucene.store.FSDirectory;
public class TestBrokenIndex {
public static void main(String[] args) throws Exception {
Path path = Files.createTempDirectory("lucene_");
Runtime.getRuntime().addShutdownHook(new Thread(new
DirectoryCleaner(path)));
FSDirectory dir = FSDirectory.open(path.toFile().toPath());
IndexWriterConfig iwc = new IndexWriterConfig()
.setMergePolicy(NoMergePolicy.INSTANCE);
try (IndexWriter iw = new IndexWriter(dir, iwc)) {
for (int i = 0; i < 10; i++) {
Document doc = new Document();
doc.add(new IntField("id", i, Store.NO));
iw.addDocument(doc);
iw.commit();
}
}
for (Path f : Files.newDirectoryStream(path)) {
String fname = f.getFileName().toString();
if (fname.endsWith(".si")) {
Files.delete(f);
break;
}
}
CheckIndex.main(new String[]{path.toString()});
}
private static class DirectoryCleaner implements Runnable {
private final Path path;
DirectoryCleaner(Path path) {
this.path = path;
}
public void run() {
try {
for (Path f : Files.newDirectoryStream(path)) {
Files.delete(f);
}
Files.delete(path);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}
}
```
When I run this test, the error does not clearly mention that there is a
corrupt segment which is causing `CheckIndex` to fail:
```java
Opening index @
/var/folders/xh/fjjhkc7n23bg9lw00x7ft4_np1t662/T/lucene_15492910455934766862
Checking index with threadCount: 1
ERROR: could not read any segments file in directory
org.apache.lucene.index.CorruptIndexException: Unexpected file read error
while reading index.
(resource=BufferedChecksumIndexInput(MemorySegmentIndexInput(path="/private/var/folders/xh/fjjhkc7n23bg9lw00x7ft4_np1t662/T/lucene_15492910455934766862/segments_a")))
at
org.apache.lucene.index.SegmentInfos.readCommit(SegmentInfos.java:297)
at org.apache.lucene.index.CheckIndex.checkIndex(CheckIndex.java:613)
at org.apache.lucene.index.CheckIndex.checkIndex(CheckIndex.java:559)
at org.apache.lucene.index.CheckIndex.doCheck(CheckIndex.java:4181)
at org.apache.lucene.index.CheckIndex.doMain(CheckIndex.java:4054)
at org.apache.lucene.index.CheckIndex.main(CheckIndex.java:3986)
at org.apache.lucene.index.TestBrokenIndex.main(TestBrokenIndex.java:36)
Caused by: java.nio.file.NoSuchFileException:
/private/var/folders/xh/fjjhkc7n23bg9lw00x7ft4_np1t662/T/lucene_15492910455934766862/_4.si
could not read any segments file in directory
at
java.base/sun.nio.fs.UnixException.translateToIOException(UnixException.java:92)
at
java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:106)
at
java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:111)
at
java.base/sun.nio.fs.UnixFileSystemProvider.newFileChannel(UnixFileSystemProvider.java:224)
at java.base/java.nio.channels.FileChannel.open(FileChannel.java:309)
at java.base/java.nio.channels.FileChannel.open(FileChannel.java:369)
at
org.apache.lucene.store.MemorySegmentIndexInputProvider.openInput(MemorySegmentIndexInputProvider.java:51)
at
org.apache.lucene.store.MMapDirectory.openInput(MMapDirectory.java:252)
at
org.apache.lucene.store.Directory.openChecksumInput(Directory.java:156)
at
org.apache.lucene.codecs.lucene99.Lucene99SegmentInfoFormat.read(Lucene99SegmentInfoFormat.java:94)
at
org.apache.lucene.index.SegmentInfos.parseSegmentInfos(SegmentInfos.java:398)
at
org.apache.lucene.index.SegmentInfos.readCommit(SegmentInfos.java:359)
at
org.apache.lucene.index.SegmentInfos.readCommit(SegmentInfos.java:295)
Caused by: java.nio.file.NoSuchFileException:
/private/var/folders/xh/fjjhkc7n23bg9lw00x7ft4_np1t662/T/lucene_15492910455934766862/_4.si
... 6 more
Suppressed: org.apache.lucene.index.CorruptIndexException: checksum
passed (b2227536). possibly transient resource issue, or a Lucene or JVM bug
(resource=BufferedChecksumIndexInput(MemorySegmentIndexInput(path="/private/var/folders/xh/fjjhkc7n23bg9lw00x7ft4_np1t662/T/lucene_15492910455934766862/segments_a")))
at
org.apache.lucene.codecs.CodecUtil.checkFooter(CodecUtil.java:501)
at
org.apache.lucene.index.SegmentInfos.readCommit(SegmentInfos.java:366)
... 7 more
Execution failed for task ':lucene:core:TestBrokenIndex.main()'.
```
The exception happens while trying to read the latestSegment, well before it
executes the check for other segments. On the contrary, if I delete data
(`.cfs/.cfe`) files instead of `.si` files, there is a more clear error:
(On replacing `if (fname.endsWith(".si")) { Files.delete(f); ... ` with `if
(fname.endsWith(".cfs")) { Files.delete(f); ... `
```java
Opening index @
/var/folders/xh/fjjhkc7n23bg9lw00x7ft4_np1t662/T/lucene_17693986113485513388
Checking index with threadCount: 1
0.00% total deletions; 10 documents; 0 deletions
Segments file=segments_a numSegments=10 version=10.0.0
id=5pu3cylg0srqobtopelrfelqu
1 of 10: name=_0 maxDoc=1
version=10.0.0
id=5pu3cylg0srqobtopelrfelpr
codec=Lucene99
compound=true
numFiles=3
size (MB)=0.002
diagnostics = {timestamp=1699544238618, java.runtime.version=21+35-LTS,
os=Mac OS X, java.vendor=Amazon.com Inc., os.arch=aarch64, os.version=13.5.2,
lucene.version=10.0.0, source=flush}
no deletions
test: open reader.........OK [took 0.013 sec]
test: check integrity.....OK [took 0.000 sec]
test: check live docs.....OK [took 0.000 sec]
test: field infos.........OK [1 fields] [took 0.000 sec]
test: field norms.........OK [0 fields] [took 0.000 sec]
test: terms, freq, prox... test: stored fields.......OK [0 total
field count; avg 0.0 fields per doc] [took 0.001 sec]
test: term vectors........OK [0 total term vector count; avg 0.0
term/freq vector fields per doc] [took 0.000 sec]
test: docvalues...........OK [1 docvalues fields; 0 BINARY; 0 NUMERIC; 0
SORTED; 1 SORTED_NUMERIC; 0 SORTED_SET] [took 0.001 sec]
test: points..............OK [1 fields, 1 points] [took 0.002 sec]
test: vectors.............OK [0 fields, 0 vectors] [took 0.000 sec]
.......
10 of 10: name=_9 maxDoc=1
version=10.0.0
id=5pu3cylg0srqobtopelrfelqr
codec=Lucene99
compound=true
numFiles=3
FAILED
WARNING: exorciseIndex() would remove reference to this segment; full
exception:
java.nio.file.NoSuchFileException:
/private/var/folders/xh/fjjhkc7n23bg9lw00x7ft4_np1t662/T/lucene_17693986113485513388/_9.cfs
at
java.base/sun.nio.fs.UnixException.translateToIOException(UnixException.java:92)
at
java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:106)
at
java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:111)
at
java.base/sun.nio.fs.UnixFileAttributeViews$Basic.readAttributes(UnixFileAttributeViews.java:55)
WARNING: exorciseIndex() would remove reference to this segment; full
exception:
at
java.base/sun.nio.fs.UnixFileSystemProvider.readAttributes(UnixFileSystemProvider.java:171)
at java.base/java.nio.file.Files.readAttributes(Files.java:1853)
at java.base/java.nio.file.Files.size(Files.java:2462)
at org.apache.lucene.store.FSDirectory.fileLength(FSDirectory.java:208)
at
org.apache.lucene.index.SegmentCommitInfo.sizeInBytes(SegmentCommitInfo.java:230)
at org.apache.lucene.index.CheckIndex.testSegment(CheckIndex.java:930)
at org.apache.lucene.index.CheckIndex.checkIndex(CheckIndex.java:739)
at org.apache.lucene.index.CheckIndex.checkIndex(CheckIndex.java:559)
at org.apache.lucene.index.CheckIndex.doCheck(CheckIndex.java:4181)
at org.apache.lucene.index.CheckIndex.doMain(CheckIndex.java:4054)
at org.apache.lucene.index.CheckIndex.main(CheckIndex.java:3986)
at org.apache.lucene.index.TestBrokenIndex.main(TestBrokenIndex.java:36)
WARNING: 1 broken segments (containing 1 documents) detected
Took 0.040 sec total.
1 broken segments (containing 1 documents) detected
WARNING: would write new segments file, and 1 documents would be lost, if
-exorcise were specified
would write new segments file, and 1 documents would be lost, if -exorcise
were specified
Execution failed for task ':lucene:core:TestBrokenIndex.main()'.
```
I would like to try to make missing `.si` files behave the same way as
having missing `.cfs` do currently and make it possible to use `-exorcise` for
this case
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