Dgraph keep printing "Rolled up x000 keys", what does it mean?

Users Dgraph
1

Hi everyone,

Our dgraph cluster in production encountered suddenly error, when the cluster is being restarted, the alpha node keep logging, and seems last for a couple of hours.
Should we keep waiting? And what does it mean? Please help!

Dgraph v22.0.2
3 vm
3 zero
3 alpha

I0221 21:40:56.500194 15845 mvcc.go:98] Rolled up 26690000 keys
I0221 21:40:56.825715 15845 mvcc.go:98] Rolled up 26691000 keys
I0221 21:40:56.975220 15845 mvcc.go:98] Rolled up 26692000 keys
I0221 21:40:57.333938 15845 mvcc.go:98] Rolled up 26693000 keys
I0221 21:40:57.638935 15845 mvcc.go:98] Rolled up 26694000 keys
I0221 21:40:57.806840 15845 mvcc.go:98] Rolled up 26695000 keys
I0221 21:40:57.994698 15845 mvcc.go:98] Rolled up 26696000 keys
I0221 21:40:58.177389 15845 mvcc.go:98] Rolled up 26697000 keys
I0221 21:40:58.408562 15845 mvcc.go:98] Rolled up 26698000 keys
I0221 21:40:58.622175 15845 mvcc.go:98] Rolled up 26699000 keys
I0221 21:40:58.885667 15845 mvcc.go:98] Rolled up 26700000 keys
I0221 21:40:59.256291 15845 mvcc.go:98] Rolled up 26701000 keys
I0221 21:40:59.611047 15845 mvcc.go:98] Rolled up 26702000 keys
I0221 21:40:59.798471 15845 mvcc.go:98] Rolled up 26703000 keys

2

Sorry the late reply.

Let’s put this way. “Rolled up” is analog to “Fragmentation” from Windows hard disk. You know? So it is a normal procedure. In technical terms it is consolidating the deltas into posting lists.