Fetch schema from a replicaset leader to apply on the clusterwide config even when migrations.up() is called on a replica (gh-56). The local schema on the replica may be not the most actual due to replication lag.
Issue a warning into log when register_sharding_key() is called with {'bucket_id'} key (gh-49). It is likely a mistake: sharding key is a set of fields, which are used to calculate bucket_id, not the bucket_id itself.
[0.4.2]
Fixed
migrations.up()is called on a replica (gh-56). The local schema on the replica may be not the most actual due to replication lag.register_sharding_key()is called with{'bucket_id'}key (gh-49). It is likely a mistake: sharding key is a set of fields, which are used to calculatebucket_id, not thebucket_iditself.