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https://issues.apache.org/jira/browse/LUCENE-5121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13713053#comment-13713053
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Hoss Man commented on LUCENE-5121:
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bq. We only provide back compat for the default codec.
WTF? Seriously?
1) is this documented anywhere?
2) I thought a major point of having multiple codecs and configurable posting
formats and docvalues formats was that the old ones could be left alone for
backcompat support, and entirely new ones, with new names, could be created
if/when there were format improvements to be made?
> 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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