Migration to 4.0 stops

I am trying to migrate a database to 4.0 but the process is stuck at "INFO [o.n.k.i.s.DatabaseMigrator] [***.db] Migrating Store files (1/6)".

It copied most of the files in the db folder to a subfolder “upgrade”.

After some time these started instead “Detected VM stop-the-world pause: {pauseTime=101, gcTime=0, gcCount=0}”

Neo4j process is killed, no error, no logs, migration stopped. Any ideas what can be wrong?

Can you still share your debug.log Thomas?

Sure, here's everything:
debug.txt (70.0 KB)

Can I restore a backup from a previous version? Or manually migrate using the copy tool or something similar? https://neo4j.com/docs/operations-manual/4.0/tools/copy/

Just wanted to note I'm having the exact same problem.


Or neo4j-admin import with database mode? :slight_smile:

I tried lowering the heap from production size at ~30G to 4G and it has continued longer than previously (more GC messages, but without killing the process). I also set debug logging to DEBUG mode, but the logs during migration is the same (no progress indication).

I’ll update again when it fails or succeeds :slight_smile:

No luck, still fails without error...

I'm having the same issue.