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https://issues.apache.org/jira/browse/SOLR-5350?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13796492#comment-13796492
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Juha Haaga commented on SOLR-5350:
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I went and searched through the example configs in all 4.* solr releases and
they correctly say ${solr.core.data.dir:}. Digging through the changelog of our
repository, it turns out that I had also used that in the initial commit, but
one of our sysadmins while configuring a production install had changed it to
${dataDir} about a year ago. I'm not sure what was his reasoning to change it
into that, or what was the original source of that syntax then, but apparently
it worked.
So basically the ${dataDir} style seems to have worked in all versions from
4.0.0-alpha until 4.4 to 4.5 migration, at which point Solr started enforcing
the ${solr.core.data.dir} variant.
---- Snip from the solrconfig.xml that worked pre-4.5 ----
<config>
<luceneMatchVersion>LUCENE_40</luceneMatchVersion>
<jmx />
<!-- <indexConfig> section could go here, but we want the defaults -->
<!-- The DirectoryFactory to use for indexes -->
<directoryFactory name="DirectoryFactory"
class="${solr.directoryFactory:solr.StandardDirectoryFactory}"/>
<dataDir>${dataDir}</dataDir>
<!-- the default high-performance update handler -->
<updateHandler class="solr.DirectUpdateHandler2">
<updateLog>
<str name="dir">${dataDir}</str>
</updateLog>
<maxPendingDeletes>100000</maxPendingDeletes>
<autoCommit>
<maxDocs>10000</maxDocs>
<maxTime>30000</maxTime>
</autoCommit>
</updateHandler>
---- end snip ----
> Solr 4.5 upgrade instructions don't mention that solrconfig.xml dataDir
> variable must now be in another format.
> ---------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-5350
> URL: https://issues.apache.org/jira/browse/SOLR-5350
> Project: Solr
> Issue Type: Bug
> Components: documentation
> Affects Versions: 4.5
> Environment: All
> Reporter: Juha Haaga
> Priority: Minor
> Labels: documentation
> Fix For: 4.5.1
>
>
> The configuration of dataDir in solrconfig.xml used to support ${dataDir}
> format at least in all the previous 4.* releases, but in 4.5 that is no
> longer true. Using the old format produces exception:
> SolrException: No system property or default value specified for dataDir
> value:${dataDir}
> The new format for the variable is ${solr.corename.data.dir:} where corename
> is defined in solr.xml. This deprecation is not mentioned in the upgrade
> instructions.
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