Cassandra 1.2.9, embedded into the RHQ 4.9 project.

I'm getting the following:

Caused by: java.lang.RuntimeException: Tried to create duplicate hard link to /data05/rhq/data/system/NodeIdInfo/snapshots/1383587405678/system-NodeIdInfo-ic-
        at org.apache.cassandra.db.ColumnFamilyStore.snapshotWithoutFlush(
        at org.apache.cassandra.db.ColumnFamilyStore.snapshot(
        at org.apache.cassandra.db.Table.snapshot(
        at org.apache.cassandra.service.StorageService.takeSnapshot(

Clearing the snapshot directory doesn't seem to fix this issue. Restarting the node doesn't fix it. This is obviously a bug, but I'm not sure what to do about it.

I don't have enough context to know what this means or what to do to fix it.