[SOLR-14657] spurious ERRORs due to race condition between SolrIndexSearcher metrics and IndexReader closing

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 8.7, master (9.0)
• Assignee: Chris M. Hostetter
• Reporter: Chris M. Hostetter
• Created: 16/Jul/20 22:19
• Updated: 04/Nov/20 15:22
• Resolved: 03/Aug/20 22:06

Description

I've seen situations in the wild where systems monitoring/polling metrics can trigger scary looking - but otherwise benign - ERRORs due to AlreadyClosedExceptions if/when the searcher/reader is in the process of being re-opened and the Gauge tries to call reader.numDocs(), etc...

We should tweak the metrics logic to just ignore these exceptions