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? Copy a database store - Operations Manual
Just wanted to note I'm having the exact same problem.
Or neo4j-admin import with database mode? 
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
No luck, still fails without error...
I'm having the same issue.