[SOLR-16925] Broken JSON indentation using JacksonJsonWriter

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 9.3
• Fix Version/s: 9.4
• Component/s: Response Writers

Environment

Problem reproduces across 6+ SolrCloud clusters.

• Assignee: Houston Putman
• Reporter: Ovidiu Mihalcea
• Created: 10/Aug/23 14:58
• Updated: 15/Oct/23 19:57
• Resolved: 22/Sep/23 15:33

Description

I'm seeing some very weird formatting using the default interface query output in SolrCloud mode. Either all the indented content is shifted by many white spaces (while keeping indents after this), either there is not indenting at all (keeping multiple lines, different from indent=false), either we get a new line between every line.

I believe it's a bug from the combination of the JacksonJsonWriter and indent=true. The Query component of the interface is quite an important feature for debugging.
The workaround was to add <queryResponseWriter name="json" class="solr.JSONResponseWriter" /> and <str name="wt">json</str> to the defaults on the /select SearchHandler, as it seems when not specifying a default wt it defaults to the JacksonJsonWriter and not JSONResponseWriter.

Issue Links

• is caused by: SOLR-16691 Use Jackson for JSON serialization
• links to: GitHub Pull Request #1843
• links to: GitHub Pull Request #1941
• links to: GitHub Pull Request #1942