The process itself sounds like it should work (it's basically a reindex so it should be safer than trying to migrate directly.)
I would check that the Luke version matches the Lucene version - if the two match, it shouldn't be possible to get issues like this. That is, the precise versions of Lucene each is using. TX On Mon, 7 Nov 2022 at 22:09, Pablo Vázquez Blázquez <pabl...@gmail.com> wrote: > > Hi! > > > I am trying to create a tool to read docs from a lucene5 index and > generate lucene9 documents from them (with docValues). That might work, > right? I am shading both lucene5 and lucene9 to avoid package conflicts. > > I am doing the following steps: > > - create IndexReader with lucene5 package over a lucene5 index > - create IndexWriter with lucene7 package > - iterate over reader.numDocs() to process each Document (lucene5) > - convert each Document (lucene5) to lucene7 Document > - for each IndexableField (lucene5) from Document (lucene5) convert > it to create an IndexableField (lucene7) > - create a SortedDocValuesField (lucene7) and add it to the > Document (lucene7) > - add the field to the Document (lucene7) > - add each converted Document to the writer > - close IndexReader and IndexWriter > > When I open the resulting migrated lucene7 index with Luke I got an error: > org.apache.lucene.index.IndexFormatTooNewException: Format version is not > supported (resource > BufferedChecksumIndexInput(MMapIndexInput(path="tests_small_index-7.x-migrator\segments_1"))): > 9 (needs to be between 6 and 7) > > When I use the tool "luceneupgrader > <https://github.com/hakanai/luceneupgrader>", I got: > java -jar luceneupgrader-0.5.2-SNAPSHOT.jar info > tests_small_index-7.x-migrator > Lucene index version: 7 > > What am I doing wrong or misleading? > > Thanks! > > El mié, 2 nov 2022 a las 21:13, Pablo Vázquez Blázquez (<pabl...@gmail.com>) > escribió: > > > Hi, > > > > Luckily we were already using lucenemigrator > > > > > > What do you mean with "lucenemigrator"? Is it a public tool? > > > > I am trying to create a tool to read docs from a lucene5 index and > > generate lucene9 documents from them (with docValues). That might work, > > right? I am shading both lucene5 and lucene9 to avoid package conflicts. > > > > Thanks! > > > > El mar, 1 nov 2022 a las 0:35, Trejkaz (<trej...@trypticon.org>) escribió: > > > >> Well... > >> > >> There's a way, but I wouldn't necessarily recommend it. > >> > >> You can write custom migration code against some version of Lucene > >> which supports doc values, to create doc values fields. It's going to > >> involve writing a FilterCodecReader which wraps your real index and > >> then pretends to also have doc values, which you'll build in a custom > >> class which works similarly to UninvertingReader. Then you pass those > >> CodecReaders to IndexWriter.addIndexes to create a new index which > >> really has those doc values. > >> > >> We did that ourselves when we had the same issue. The only painful > >> thing about it is having to keep around older versions of lucene to do > >> that migration. Forever. Luckily we were already using lucenemigrator, > >> which has the older versions baked into it with package prefixes. So > >> that library will get fatter and fatter over time but at least our own > >> code only gets fatter at the rate migrations are added. > >> > >> The same approach works for any other kind of ad-hoc migration you > >> might want to perform. e.g., you might want to create points. Or > >> remove an index for a field. Or add an index for a field. > >> > >> TX > >> > >> > >> On Tue, 1 Nov 2022 at 02:57, Pablo Vázquez Blázquez <pabl...@gmail.com> > >> wrote: > >> > > >> > Hi all, > >> > > >> > Thank you all for your responses. > >> > > >> > So, when updating to a newer (major) Lucene version that modifies its > >> > codecs, there is no way to ensure everything keeps working properly, > >> unless > >> > re-indexing, right? > >> > > >> > Apart from not having some original sources that were indexed (which I > >> will > >> > try to solve by using the *IndexUpgrader *tool), I have another > >> problem: I > >> > was using the org.apache.lucene.uninverting.UninvertingReader to perform > >> > queries against the index, mainly using the grouping api. But > >> currently, it > >> > was removed (since Lucene 7.0). So, again, do I have any other > >> alternative, > >> > apart from re-indexing to use docValues? > >> > > >> > To give you more context, I am a developer of a tool that multiple > >> > customers can use to index their data (currently, with Lucene 5.5.5). We > >> > are planning to upgrade to Lucene 9 (because of some vulnerabilities > >> > affecting Lucene 5.5.5) and I think asking them to reindex will not go > >> down > >> > well :( > >> > > >> > Regards, > >> > > >> > El sáb, 29 oct 2022 a las 23:31, Matt Davis (<kryptonics...@gmail.com>) > >> > escribió: > >> > > >> > > Inside of Zulia search engine, the object being indexed is always a > >> > > JSON/BSON object and we store the BSON as a stored byte field in the > >> > > index. This allows easy internal reindexing when the searchable > >> fields > >> > > change but also allows us to update to the latest lucene version. > >> > > Combined with using lucene-backward-codecs an older index than the > >> current > >> > > major version can be opened and reindexed. If you have stored all the > >> > > fields (or a json/bson) in the index, it would be easy to reindex in > >> the > >> > > new format. If you have not, maybe opening with > >> lucene-backward-codecs > >> > > will be enough for your use case. > >> > > > >> > > Thanks, > >> > > Matt > >> > > > >> > > On Sat, Oct 29, 2022 at 2:30 PM Baris Kazar <baris.ka...@oracle.com> > >> > > wrote: > >> > > > >> > > > It is always great practice to retain non-indexed > >> > > > data since when Lucene changes version, > >> > > > even minor version, I always reindex. > >> > > > > >> > > > Best regards > >> > > > ________________________________ > >> > > > From: Gus Heck <gus.h...@gmail.com> > >> > > > Sent: Saturday, October 29, 2022 2:17 PM > >> > > > To: java-user@lucene.apache.org <java-user@lucene.apache.org> > >> > > > Subject: Re: Best strategy migrate indexes > >> > > > > >> > > > Hi Pablo, > >> > > > > >> > > > The deafening silence is probably nobody wanting to give you the bad > >> > > news. > >> > > > You are on a mission that may not be feasible, and even if you can > >> get it > >> > > > to "work", the end result won't likely be equivalent to indexing the > >> > > > original data with Lucene 9.x. The indexing process is fundamentally > >> > > lossy > >> > > > and information originally used to produce non-stored fields will > >> have > >> > > been > >> > > > thrown out. A simple example is things like stopwords or anything > >> > > analyzed > >> > > > with subclasses of FilteringTokenFilter. If the stop word list > >> changed, > >> > > or > >> > > > the details of one of these filters changed (bugfix?), you will end > >> up > >> > > with > >> > > > a different result than indexing with 9.x. This is just one > >> > > > example, another would be stemming where the index likely only > >> contains > >> > > the > >> > > > stem, not the whole word. Other folks who are more interested in the > >> > > > details of our codecs than I am can probably provide further > >> examples on > >> > > a > >> > > > more fundamental level. Lucene is not a database, and the source > >> > > documents > >> > > > should always be retained in a form that can be reindexed. If you > >> have > >> > > > inherited a system where source material has not been retained, you > >> have > >> > > a > >> > > > difficult project and may have some potentially painful expectation > >> > > setting > >> > > > to perform. > >> > > > > >> > > > Best, > >> > > > Gus > >> > > > > >> > > > > >> > > > > >> > > > On Fri, Oct 28, 2022 at 8:01 AM Pablo Vázquez Blázquez < > >> > > pabl...@gmail.com> > >> > > > wrote: > >> > > > > >> > > > > Hi all, > >> > > > > > >> > > > > I have some indices indexed with lucene 5.5.0. I have updated my > >> > > > > dependencies and code to Lucene 7 (but my final goal is to use > >> Lucene > >> > > 9) > >> > > > > and when trying to work with them I am having the exception: > >> > > > > org.apache.lucene.index.IndexFormatTooOldException: Format > >> version is > >> > > not > >> > > > > supported (resource > >> > > > > > >> > > > > > >> > > > > >> > > > >> BufferedChecksumIndexInput(MMapIndexInput(path=".......\tests\segments_b"))): > >> > > > > this index is too old (version: 5.5.0). This version of Lucene > >> only > >> > > > > supports indexes created with release 6.0 and later. > >> > > > > > >> > > > > I want to migrate from Lucene 5.x to Lucene 9.x. Which is the best > >> > > > > strategy? Is there any tool to migrate the indices? Is it > >> mandatory to > >> > > > > reindex? In this case, how can I deal with this when I do not > >> have the > >> > > > > sources of documents that generated my current indices (I mean, I > >> just > >> > > > have > >> > > > > the indices themselves)? > >> > > > > > >> > > > > Thanks, > >> > > > > > >> > > > > -- > >> > > > > Pablo Vázquez > >> > > > > (pabl...@gmail.com) > >> > > > > > >> > > > > >> > > > > >> > > > -- > >> > > > > >> > > > > >> > > > >> https://urldefense.com/v3/__http://www.needhamsoftware.com__;!!ACWV5N9M2RV99hQ!PVR-c0gAs5FpIrnotHWeo3sEWScxV8oFJrVpGdItGZictcDbRvnp5aZSqCRhglMCYqQsewQOuio4iIYARA$ > >> > > > (work) > >> > > > > >> > > > > >> > > > >> https://urldefense.com/v3/__http://www.the111shift.com__;!!ACWV5N9M2RV99hQ!PVR-c0gAs5FpIrnotHWeo3sEWScxV8oFJrVpGdItGZictcDbRvnp5aZSqCRhglMCYqQsewQOuirxfFWpEQ$ > >> > > > (play) > >> > > > > >> > > > >> > > >> > > >> > -- > >> > Pablo Vázquez > >> > (pabl...@gmail.com) > >> > >> --------------------------------------------------------------------- > >> To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org > >> For additional commands, e-mail: java-user-h...@lucene.apache.org > >> > >> > > > > -- > > Pablo Vázquez > > (pabl...@gmail.com) > > > > > -- > Pablo Vázquez > (pabl...@gmail.com) --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
