Thank you Andi, you're awesome!
> On 5 Jun 2019, at 00:33, Andi Vajda <va...@apache.org> wrote:
>
>
> In rev 1860637 I refreshed the list of supported lucene module to be built
> with PyLucene. The lucene-backward-codecs module was indeed missing.
>
> Please, try it out with pylucene 7.7.1 (refresing its Makefile from trunk)
> and let me know if it fixes your problem.
>
> Thanks !
>
> Andi..
>
> On Tue, 4 Jun 2019, David Allouche wrote:
>
>> Hello,
>>
>> I use pylucene, and I am upgrading from 6.5.0 to 7.7.1.
>>
>> Opening my old index using the new pylucene, I get
>>
>>> Traceback (most recent call last):
>>> ...
>>> File "/home/user/jobaffinity/lib/luceneindex.py", line 58, in
>>> create_lucene_index_maybe
>>> writer = IndexWriter(directory, config)
>>> lucene.JavaError: <super: <class 'JavaError'>, <JavaError object>>
>>> Java stacktrace:
>>> java.lang.IllegalArgumentException: Could not load codec 'Lucene62'. Did
>>> you forget to add lucene-backward-codecs.jar?
>>> at org.apache.lucene.index.SegmentInfos.readCodec(SegmentInfos.java:428)
>>> at org.apache.lucene.index.SegmentInfos.readCommit(SegmentInfos.java:360)
>>> at org.apache.lucene.index.SegmentInfos.readCommit(SegmentInfos.java:291)
>>> at org.apache.lucene.index.IndexWriter.<init>(IndexWriter.java:845)
>>> Caused by: java.lang.IllegalArgumentException: An SPI class of type
>>> org.apache.lucene.codecs.Codec with name 'Lucene62' does not exist. You
>>> need to add the corresponding JAR file supporting this SPI to your
>>> classpath. The current classpath supports the following names: [Lucene70]
>>> at org.apache.lucene.util.NamedSPILoader.lookup(NamedSPILoader.java:116)
>>> at org.apache.lucene.codecs.Codec.forName(Codec.java:116)
>>> at org.apache.lucene.index.SegmentInfos.readCodec(SegmentInfos.java:424)
>>> ... 3 more
>>
>> I am really not familiar with the Java side of things. With some help from
>> the web, I found out where to download the jars.
>>
>> I presume I need
>> http://central.maven.org/maven2/org/apache/lucene/lucene-backward-codecs/7.7.1/lucene-backward-codecs-7.7.1.jar
>>
>> But then, I am quite clueless about what to do. I tried dumping the jar
>> right next to lucene-core-7.7.1.jar, in my
>> $(VENV)/lib/python2.7/site-packages/lucene, but that does not seem to help.
>>
>> I have a large-ish index with about 22M entries, used in a public-facing
>> service, so I very much like to avoid rebuilding the index every time I
>> upgrade pylucene.
>>
>> I could reverse-engineer this script:
>> https://github.com/cominvent/solr-tools/blob/master/upgradeindex/upgradeindex.sh
>>
>> But that would require me to put the service down while running the
>> migration.
>>
>> How can I package the lucene-backwards-codecs in pylucene?
>>
>>
>>
