Hi
On running a quick test after a handful of minor code changes to deal
with 4.10 deprecations, a program that updates an existing index
failed with
Exception in thread "main" java.lang.IllegalStateException: cannot
write 3x SegmentInfo unless codec is Lucene3x (got: Lucene40)
at org.apache.lucene.index.SegmentInfos.write3xInfo(SegmentInfos.java:607)
and along the way did something to the index to make it unusable.
Digging a bit deeper and working on a different old test index that
was lying around, and taking a backup first this time, this is
reproducible.
The working index:
total 1036
-rw-r--r-- 1 tril users 165291 Jan 18 2013 _0.fdt
-rw-r--r-- 1 tril users 125874 Jan 18 2013 _0.fdx
-rw-r--r-- 1 tril users 1119 Jan 18 2013 _0.fnm
-rw-r--r-- 1 tril users 378015 Jan 18 2013 _0_Lucene40_0.frq
-rw-r--r-- 1 tril users 350628 Jan 18 2013 _0_Lucene40_0.tim
-rw-r--r-- 1 tril users 13988 Jan 18 2013 _0_Lucene40_0.tip
-rw-r--r-- 1 tril users 311 Jan 18 2013 _0.si
-rw-r--r-- 1 tril users 69 Jan 18 2013 segments_2
-rw-r--r-- 1 tril users 20 Jan 18 2013 segments.gen
and output from 4.10 CheckIndex
Opening index @ index/
Segments file=segments_2 numSegments=1 version=4.0.0.2 format=
1 of 1: name=_0 docCount=15730
version=4.0.0.2
codec=Lucene40
compound=false
numFiles=7
size (MB)=0.987
diagnostics = {os=Linux, os.version=3.1.0-1.2-desktop,
source=flush, lucene.version=4.0.0 1394950 - rmuir - 2012-10-06
02:58:12, os.arch=amd64, java.version=1.7.0_10, java.vendor=Oracle
Corporation}
no deletions
test: open reader.........OK
test: check integrity.....OK
test: check live docs.....OK
test: fields..............OK [13 fields]
test: field norms.........OK [0 fields]
test: terms, freq, prox...OK [53466 terms; 217447 terms/docs
pairs; 139382 tokens]
test: stored fields.......OK [15730 total field count; avg 1 fields per doc]
test: term vectors........OK [0 total vector count; avg 0
term/freq vector fields per doc]
test: docvalues...........OK [0 docvalues fields; 0 BINARY; 0
NUMERIC; 0 SORTED; 0 SORTED_NUMERIC; 0 SORTED_SET]
No problems were detected with this index.
Now run this little program
public static void main(final String[] _args) throws Exception {
File index = new File(_args[0]);
IndexWriterConfig iwcfg = new IndexWriterConfig(Version.LUCENE_4_10_0,
new StandardAnalyzer());
iwcfg.setOpenMode(IndexWriterConfig.OpenMode.CREATE_OR_APPEND);
Directory d = FSDirectory.open(index, new SimpleFSLockFactory(index));
IndexWriter iw = new IndexWriter(d, iwcfg);
Document doc1 = new Document();
doc1.add(new StringField("type", "test", Field.Store.NO));
iw.addDocument(doc1);
iw.close();
}
and it fails with
Exception in thread "main" java.lang.IllegalStateException: cannot
write 3x SegmentInfo unless codec is Lucene3x (got: Lucene40)
at org.apache.lucene.index.SegmentInfos.write3xInfo(SegmentInfos.java:607)
at org.apache.lucene.index.SegmentInfos.write(SegmentInfos.java:524)
at org.apache.lucene.index.SegmentInfos.prepareCommit(SegmentInfos.java:1017)
at org.apache.lucene.index.IndexWriter.startCommit(IndexWriter.java:4549)
at
org.apache.lucene.index.IndexWriter.prepareCommitInternal(IndexWriter.java:3062)
at org.apache.lucene.index.IndexWriter.commitInternal(IndexWriter.java:3169)
at org.apache.lucene.index.IndexWriter.shutdown(IndexWriter.java:915)
at org.apache.lucene.index.IndexWriter.close(IndexWriter.java:986)
at org.apache.lucene.index.IndexWriter.close(IndexWriter.java:956)
at t.main(t.java:25)
and when run CheckIndex again get
Opening index @ index/
ERROR: could not read any segments file in directory
java.nio.file.NoSuchFileException: /tmp/lucene/index/_0.si
at sun.nio.fs.UnixException.translateToIOException(UnixException.java:86)
at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:102)
at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:107)
at
sun.nio.fs.UnixFileSystemProvider.newFileChannel(UnixFileSystemProvider.java:176)
at java.nio.channels.FileChannel.open(FileChannel.java:287)
at java.nio.channels.FileChannel.open(FileChannel.java:334)
at org.apache.lucene.store.MMapDirectory.openInput(MMapDirectory.java:196)
at
org.apache.lucene.codecs.lucene40.Lucene40SegmentInfoReader.read(Lucene40SegmentInfoReader.java:52)
at org.apache.lucene.index.SegmentInfos.read(SegmentInfos.java:362)
at org.apache.lucene.index.SegmentInfos$1.doBody(SegmentInfos.java:458)
at
org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(SegmentInfos.java:913)
at
org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(SegmentInfos.java:759)
at org.apache.lucene.index.SegmentInfos.read(SegmentInfos.java:454)
at org.apache.lucene.index.CheckIndex.checkIndex(CheckIndex.java:414)
at org.apache.lucene.index.CheckIndex.main(CheckIndex.java:2096)
which is true
total 1032
-rw-r--r-- 1 tril users 165291 Jan 18 2013 _0.fdt
-rw-r--r-- 1 tril users 125874 Jan 18 2013 _0.fdx
-rw-r--r-- 1 tril users 1119 Jan 18 2013 _0.fnm
-rw-r--r-- 1 tril users 378015 Jan 18 2013 _0_Lucene40_0.frq
-rw-r--r-- 1 tril users 350628 Jan 18 2013 _0_Lucene40_0.tim
-rw-r--r-- 1 tril users 13988 Jan 18 2013 _0_Lucene40_0.tip
-rw-r--r-- 1 tril users 69 Jan 18 2013 segments_2
-rw-r--r-- 1 tril users 20 Jan 18 2013 segments.gen
I don't recall the origins of this index but it may well have been
created in the distant past and been upgraded, explicitly or
automatically, along the way. Although evidently not for a while.
Running the same test with lucene 4.9.0 and minimal mods to the
program runs to successful completion. Here's the CheckIndex output:
Opening index @ index-4.9.updated/
Segments file=segments_3 numSegments=2 versions=[4.0.0.2 .. 4.9] format=
1 of 2: name=_0 docCount=15730
codec=Lucene40
compound=false
numFiles=7
size (MB)=0.987
diagnostics = {os=Linux, os.version=3.1.0-1.2-desktop,
source=flush, lucene.version=4.0.0 1394950 - rmuir - 2012-10-06
02:58:12, os.arch=amd64, java.version=1.7.0_10, java.vendor=Oracle
Corporation}
no deletions
test: open reader.........OK
test: check integrity.....OK
test: check live docs.....OK
test: fields..............OK [13 fields]
test: field norms.........OK [0 fields]
test: terms, freq, prox...OK [53466 terms; 217447 terms/docs
pairs; 139382 tokens]
test: stored fields.......OK [15730 total field count; avg 1 fields per doc]
test: term vectors........OK [0 total vector count; avg 0
term/freq vector fields per doc]
test: docvalues...........OK [0 docvalues fields; 0 BINARY; 0
NUMERIC; 0 SORTED; 0 SORTED_NUMERIC; 0 SORTED_SET]
2 of 2: name=_1 docCount=1
codec=Lucene49
compound=true
numFiles=3
size (MB)=0.001
diagnostics = {timestamp=1410281698360, os=Linux,
os.version=3.1.0-1.2-desktop, source=flush, lucene.version=4.9.0
1604085 - rmuir - 2014-06-20 06:22:23, os.arch=amd64,
java.version=1.7.0_10, java.vendor=Oracle Corporation}
no deletions
test: open reader.........OK
test: check integrity.....OK
test: check live docs.....OK
test: fields..............OK [1 fields]
test: field norms.........OK [0 fields]
test: terms, freq, prox...OK [1 terms; 1 terms/docs pairs; 0 tokens]
test: stored fields.......OK [0 total field count; avg 0 fields per doc]
test: term vectors........OK [0 total vector count; avg 0
term/freq vector fields per doc]
test: docvalues...........OK [0 docvalues fields; 0 BINARY; 0
NUMERIC; 0 SORTED; 0 SORTED_NUMERIC; 0 SORTED_SET]
No problems were detected with this index.
--
Ian.
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