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https://issues.apache.org/jira/browse/LUCENE-5121?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Muir resolved LUCENE-5121.
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Resolution: Not A Problem
Currently (as documented), we don't provide index back compat for experimental
codecs in lucene-codecs.jar.
Backwards compatibility is not free: I think supporting the official format is
really all we can handle and still have maintainable code. But if we want to
discuss expanding the backwards compatibility policy, lets do that on a mailing
list thread.
> 4.4 RC0 can not read indexes created with 4.2.1 using Disk based docvals
> ------------------------------------------------------------------------
>
> Key: LUCENE-5121
> URL: https://issues.apache.org/jira/browse/LUCENE-5121
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Hoss Man
> Priority: Blocker
> Fix For: 4.4
>
> Attachments: disk_docvals_bug.tgz
>
>
> On the #solr irc channel, user adityab reported a problem trying to upgrade
> an existing solr instance from 4.2.1 to the 4.4 RC0 code. The specific error
> he reported was a "CorruptIndexException: invalid type: 65" from
> DiskDocValuesProducer.readFields using an MMapIndexInput. While waiting for
> more details from adityab on reproducible configs, i attempted to do a
> trivial test using simple solr configs based on the docvals test configs, and
> was able to trigger a slightly different error in which
> DiskDocValuesProducer.readFields caused an EOFException.
> The problem reproduces on both solr init, and when using CheckIndex --
> details to reproduce to follow in an attachment/comment
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