Document Oak
Add reference to to upgrade instructions
@@ -45,6 +45,11 @@ before they are applied to production.
The following instructions assume a cluster with two nodes C1 and C2 running on
Oak 1.6 or older.
+* Remove documents potentially created by [OAK-4345][0]. The issue only affected
+deployments based on MongoDB. Connect to the database with a MongoDB shell and
+then execute:
+
+ > db.nodes.remove({_id:{$type:7}})
* Stop cluster node C1. If possible, the cluster node should be shut down
gracefully because the next step can only be executed when C1 is considered
inactive. A recovery of C1 is otherwise necessary if it is forcefully killed.
@@ -105,7 +110,8 @@ should be replaced. Please note, the partial index on `_deletedOnce` and
> db.nodes.dropIndex("_deletedOnce_1")
{ "nIndexesWas" : 6, "ok" : 1 }
- See also instructions how to [build indexes on a replica set][0] to minimize
+ See also instructions how to [build indexes on a replica set][1] to minimize
impact on the system.
-[0]: https://docs.mongodb.com/manual/tutorial/build-indexes-on-replica-sets/#index-building-replica-sets
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+[0]: https://issues.apache.org/jira/browse/OAK-4345
+[1]: https://docs.mongodb.com/manual/tutorial/build-indexes-on-replica-sets/#index-building-replica-sets
\ No newline at end of file
