[SOLR-7381] Improve Debuggability of SolrCloud using MDC

• Type: Improvement
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Fix Version/s: 5.2, 6.0
• Component/s: SolrCloud
• Assignee: Shalin Shekhar Mangar
• Reporter: Shalin Shekhar Mangar
• Created: 12/Apr/15 13:52
• Updated: 12/Nov/18 17:54
• Resolved: 26/May/15 14:44

Description

SOLR-6673 added MDC based logging in a few places but we have a lot of ground to cover.

1. Threads created via thread pool executors do not inherit MDC values and those are some of the most interesting places to log MDC context.
2. We must expose node names (in tests) so that we can debug faster
3. We can expose more information via thread names so that a thread dump has enough context to help debug problems in production

This is critical to help debug SolrCloud failures.

Issue Links

• contains: SOLR-7270 Add URL of remote host in distrib update thread names to improve debuggability via stack traces.
• is related to: SOLR-6673 MDC based logging of collection, shard etc.