[SOLR-13159] Autoscaling not distributing collection evenly

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 8.0
• Fix Version/s: 8.3
• Component/s: AutoScaling
• Assignee: Andrzej Bialecki
• Reporter: Gus Heck
• Created: 21/Jan/19 21:11
• Updated: 16/Sep/19 16:51
• Resolved: 16/Sep/19 16:51

Description

I recently ran into a very strange behavior described in detail in the mail linked at the bottom of this description. In short: 

1. Default settings didn't distribute nodes evenly on brand new 50 node cluster
2. Can't seem to write rules producing suggestions to distribute them evenly 
3. Suggestions are made that then fail despite quiet cluster, no changes.

Also of note was diagnostic output containing this seemingly impossible result with 2 cores counted and no replicas listed:

            {
                "node": "solr-2.customer.redacted.com:8983_solr",
                "isLive": true,
                "cores": 2,
                "freedisk": 140.03918838500977,
                "totaldisk": 147.5209503173828,
                "replicas": {}
            },

I will attach anonymized cluster status output and autoscaling.json shortly 

This issue may be related to SOLR-13142

http://mail-archives.apache.org/mod_mbox/lucene-dev/201901.mbox/%3CCAEUNc48HRZA7qo-uKtJQEtZnO9VG9OErQZGzoOmCTBe7C9zvNw%40mail.gmail.com%3E

 

Issue Links

• is part of: SOLR-13248 Autoscaling based replica placement is broken out of the box