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https://issues.apache.org/jira/browse/SOLR-15198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17298544#comment-17298544
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David Smiley commented on SOLR-15198:
-------------------------------------
I think these thread names with MDC is deliberate. See
org.apache.solr.common.util.ExecutorUtil.MDCAwareThreadPoolExecutor#execute
> Slf4j logs threadName incorrectly in some cases
> -----------------------------------------------
>
> Key: SOLR-15198
> URL: https://issues.apache.org/jira/browse/SOLR-15198
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: logging
> Affects Versions: 8.6
> Reporter: Megan Carey
> Priority: Minor
>
> I'm running Solr 8.6, and I'm seeing some logs report threadName with the
> entire log message and MDC. I haven't dug in too much, but CoreContainer logs
> seem to be the biggest culprit. Not sure if it's an issue of thread naming
> (including delimiter in name?), SolrLogFormat parsing, or something else
> altogether.
> ```
> { [
> CoreAdminHandler.action: CREATE
> CoreAdminHandler.asyncId:
> rebalance_replicas_trigger/41b16883a3bcTdzc5xqm9leudgekft79dpj5zl/372246269149506
> collection: collectionName
> core: collectionName_shard1_0_0_0_1_0_0_0_1_1_0_1_0_0_replica_s7606
> level: INFO
> logger: org.apache.solr.core.CoreContainer
> message: Creating SolrCore
> 'collectionName_shard1_0_0_0_1_0_0_0_1_1_0_1_0_0_replica_s7606' using
> configuration from configset crm, trusted=true
> node_name: REDACTED_HOSTNAME:8983_solr
> replica: core_node7607
> shard: shard1_0_0_0_1_0_0_0_1_1_0_1_0_0
> threadId: 4861
> *threadName:
> parallelCoreAdminExecutor-19-thread-6-processing-n:REDACTED_HOSTNAME:8983_solr
> x:collectionName_shard1_0_0_0_1_0_0_0_1_1_0_1_0_0_replica_s7606
> t:Shared-932ac44c-06a4-44d3-ba8f-5a64c8f8d708
> rebalance_replicas_trigger//41b16883a3bcTdzc5xqm9leudgekft79dpj5zl//372246269149506
> CREATE*
> timestamp: 2021-02-03T16:26:56.482Z
> trace_id: Shared-932ac44c-06a4-44d3-ba8f-5a64c8f8d708
> }
> ```
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