[CASSANDRA-12296] Better error message when streaming with insufficient sources in DC

• Type: Bug
• Status: Resolved
• Priority: Low
• Resolution: Fixed
• Fix Version/s: 3.0.10, 3.10
• Labels: lhf
• Severity: Low
• Assignee: Kurt Greaves
• Reporter: Jim Witschey

Authors

Kurt Greaves

Reviewers

Jeff Jirsa

• Created: 26/Jul/16 14:14
• Updated: 16/Apr/19 09:30
• Resolved: 07/Nov/16 04:29

Description

This came up in discussion of CASSANDRA-11687. nodetool rebuild was failing in a dtest. pauloricardomg explained:

before CASSANDRA-11848 the local node could be considered a source, while now sources are restricted only to dc2, so since system_auth uses SimpleStrategy depending on the token arrangement there could or not be sources from dc2. Fix is to either use -Dcassandra.consistent.rangemovement=false or update system_auth to use NetworkTopologyStrategy with 2 dcs..

This is, at the very least, a UX bug. When rebuild fails, it fails with

nodetool: Unable to find sufficient sources for streaming range (-3287869951390391138,-1624006824486474209] in keyspace system_auth with RF=1.If you want to ignore this, consider using system property -Dcassandra.consistent.rangemovement=false.

which suggests that a user should give up consistency guarantees when it's not necessary.