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https://issues.apache.org/jira/browse/SOLR-5262?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13775704#comment-13775704
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Hoss Man commented on SOLR-5262:
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once resolved, this ref guide page needs updated, note comment...
https://cwiki.apache.org/confluence/display/solr/Configuring+solrconfig.xml?focusedCommentId=34023973&#comment-34023973
> implicit solr.core.* properties should always be available, regardless of
> wether underlying core.property is specified
> ----------------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-5262
> URL: https://issues.apache.org/jira/browse/SOLR-5262
> Project: Solr
> Issue Type: Bug
> Reporter: Hoss Man
>
> reviewing the docs for core.properties and implicit property substitution, i
> noticed what seems to be a bug in how implicit properties are made available
> for config files.
> if you look at CoreDescriptor.buildSubstitutableProperties, the logic only
> loops over the names found in "coreProperties" -- meaning that if a user
> doesn't explicitly set one of the "standard" properties there, then the
> corrisponding "solr.core.propname" implicit value (with the default value)
> will not be available.
> the point of the implicit properties is that they should *always* be
> available for use in configs, even if the value comes from the hardcoded
> default, or is derived from something else.
> (ie: if you put this in the example solrconfig.xml...
> {noformat}
> <lst name="defaults">
> <str name="echoParams">all</str>
> <int name="rows">10</int>
> <str name="df">text</str>
> <str name="hoss">${solr.core.ulogDir}</str>
> </lst>
> {noformat}
> ...solr will fail to start up, unless you also add an explicit "ulogDir=tlog"
> to the core.properties file -- but this should work w/o the user explicitly
> configuring the ulogDir property
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