[SOLR-5875] QueryComponent.mergeIds() unmarshals all docs' sort field values once per doc instead of once per shard

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 4.7
• Fix Version/s: 4.7.1, 4.8, 6.0
• Component/s: search
• Assignee: Steven Rowe
• Reporter: Steven Rowe
• Created: 17/Mar/14 15:05
• Updated: 30/Oct/19 17:49
• Resolved: 17/Mar/14 15:31

Description

SOLR-5354 added unmarshalling of distributed sort field values in QueryComponent.mergeIds(), but incorrectly performs this (unmarshalling all docs' sort field values) for every doc, and stores the result with each doc. This is unnecessary, inefficient, and extremely wasteful of memory.

In an offline conversation, alexey described the issue to me and located the likely problem, and [e-mail] located the problem code via inspection.

This bug is very likely the problem described on the solr-user mailing list here: SolrCloud constantly crashes after upgrading to Solr 4.7

Issue Links

• relates to: SOLR-5354 Distributed sort is broken with CUSTOM FieldType