[SOLR-3751] Add defensive checks against errant updates to distrib update processor.

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 4.0, 6.0
• Component/s: SolrCloud
• Assignee: Mark Miller
• Reporter: Mark Miller
• Created: 23/Aug/12 03:49
• Updated: 09/May/16 18:47
• Resolved: 30/Aug/12 19:24

Description

The distrib update processor should do sanity checks on incoming updates - you never know what greedy routers might hang to some packets for while before letting them go.

We can quickly and easily check a couple things.

If the update is from a Leader we can check that we don't currently think we are the leader (using a local isLeader state).

If the update is from a Leader we can check that that leader matches what is in our current ClusterState.