[LUCENE-5574] NRT Reader close can wipe index it doesn't own

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 4.7.1, 4.8, 6.0
• Fix Version/s: 4.7.2, 4.8, 6.0
• Component/s: core/index
• Lucene Fields: New
• Assignee: Unassigned
• Reporter: Simon Willnauer
• Created: 04/Apr/14 08:44
• Updated: 28/Aug/22 14:04
• Resolved: 04/Apr/14 22:09

Description

Today NRT Readers try to clean up unused files via their IW reference when they are closed. Yet, if the index writer is already closed another index could have been created on the same directory which can create the same files as the IW before. For the NRT Reader those files are not referenced and it will simply wipe them away. If you use this in a replication scenario where directories are reused this can simply wipe your index away or in combination with the FSync issue LUCENE-5570 create 0-byte files. I have a test that reproduces this issue

Issue Links

• is related to: SOLR-5948 Strange jenkins failure: *.si file not found in the middle of cloud test