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https://issues.apache.org/jira/browse/LUCENE-5121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13713360#comment-13713360
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Robert Muir commented on LUCENE-5121:
-------------------------------------
{quote}
Well the fields that we use for docValues are defined as below. Whats is
non-standard here?
{quote}
The wiki page is quite clear about this:
http://wiki.apache.org/solr/DocValues#Specifying_a_different_Codec_implementation
{quote}
Where as my solrconfig.xml file i had to add this line to make it work. (cause
we upgraded from 3.5 to 4.2.1)
<codecFactory class="solr.SchemaCodecFactory"/>
{quote}
Its too bad you didn't also include the comment that goes with that line in
solrconfig.xml, which also warns about this!
{noformat}
<!-- The CodecFactory for defining the format of the inverted index.
The default implementation is SchemaCodecFactory, which is the official
Lucene
index format, but hooks into the schema to provide per-field
customization of
the postings lists and per-document values in the fieldType element
(postingsFormat/docValuesFormat). Note that most of the alternative
implementations
are experimental, so if you choose to customize the index format, its a
good
idea to convert back to the official format e.g. via
IndexWriter.addIndexes(IndexReader)
before upgrading to a newer version to avoid unnecessary reindexing.
-->
{noformat}
> 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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