[LUCENE-5492] IndexFileDeleter AssertionError in presence of *_upgraded.si files

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 4.7
• Lucene Fields: New
• Assignee: Michael McCandless
• Reporter: Tim Smith
• Created: 05/Mar/14 20:22
• Updated: 28/Aug/22 14:01

Description

When calling IndexWriter.deleteUnusedFiles against an index that contains 3.x segments, i am seeing the following exception:

java.lang.AssertionError: failAndDumpStackJunitStatment: RefCount is 0 pre-decrement for file "_0_upgraded.si"
        at org.apache.lucene.index.IndexFileDeleter$RefCount.DecRef(IndexFileDeleter.java:630)
        at org.apache.lucene.index.IndexFileDeleter.decRef(IndexFileDeleter.java:514)
        at org.apache.lucene.index.IndexFileDeleter.deleteCommits(IndexFileDeleter.java:286)
        at org.apache.lucene.index.IndexFileDeleter.revisitPolicy(IndexFileDeleter.java:393)
        at org.apache.lucene.index.IndexWriter.deleteUnusedFiles(IndexWriter.java:4617)

I believe this is caused by IndexFileDeleter not being aware of the Lucene3x Segment Infos Format (notably the _upgraded.si files created to "upgrade" an old index)

This is new in 4.7 and did not occur in 4.6.1

Still trying to track down a workaround/fix

Issue Links

• is related to: LUCENE-5940 change index backwards compatibility policy.