Alex Deparvu created SOLR-16676:
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Summary: Http2SolrClient loss of MDC context
Key: SOLR-16676
URL: https://issues.apache.org/jira/browse/SOLR-16676
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
Components: SolrJ
Affects Versions: 9.1, 9.0
Reporter: Alex Deparvu
The Http2SolrClient loses MDC context information when running an async request
in Solr 9.x.
The issue is the 'Request#send' [0] call is actually async itself and by the
time the response listener kicks in to push the response processing to the
executor the MDC context is already lost, so the executor will no longer have
access to the original MDC in order to push it forward onto the thread that
will process the response.
This is very difficult to capture on a running system, there are no logs during
this window. I only saw it because I was specifically looking at thread names
for a different reason.
This is how it is reflected in the thread names:
- how it should be (Solr 8 style):
httpShardExecutor-5-thread-19-processing-gettingstarted_shard2_replica_n2
core_node5 localhost:8983_solr gettingstarted shard2 localhost-4
- how it is in Solr 9 (due to no MDC context) httpShardExecutor-5-thread-10
I can't tell if there is anything breaking due to this.
[0]
[https://github.com/apache/solr/blob/7eee7a8ad3c43db0dc26c663dd16764d1fb3dbf4/solr/solrj/src/java/org/apache/solr/client/solrj/impl/Http2SolrClient.java#L458]
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