[SOLR-3764] Upgrading to Solr 4 from Solr 3.x doesn't support "single core" mode Solr Home dirs (ie: all 3.x examples)

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Cannot Reproduce
• Affects Version/s: 4.0-ALPHA, 4.0-BETA
• Fix Version/s: 4.0
• Assignee: Unassigned
• Reporter: Chris M. Hostetter
• Created: 29/Aug/12 00:23
• Updated: 10/May/13 10:33
• Resolved: 29/Aug/12 00:47

Description

if users were previously using a "Solr Home" based on the solr example, and attempt to upgrade to Solr 4 using their existing Solr Home dir, they will get an error because the implicit behavior when no solr.xml file is found seems to be assuming that a "./collection1" instanceDir will exist.