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https://issues.apache.org/jira/browse/SOLR-17794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17985632#comment-17985632
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Mikhail Khludnev commented on SOLR-17794:
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a tech note
Params are loaded into req.toLog here [1] that's happened before stream body is
parsed and json is inserted as json param at [2]
[1]
https://github.com/apache/solr/blob/e17078a98a8ebea1a28853d02527f4dc81da4d6b/solr/core/src/java/org/apache/solr/core/SolrCore.java#L2916
[2]
https://github.com/apache/solr/blob/b76a29d17c874806e3b6516810772e2238e93098/solr/core/src/java/org/apache/solr/handler/RequestHandlerBase.java#L235
> Logging JSON Request API parameters
> -----------------------------------
>
> Key: SOLR-17794
> URL: https://issues.apache.org/jira/browse/SOLR-17794
> Project: Solr
> Issue Type: Bug
> Components: JSON Request API, logging
> Affects Versions: 9.8.1
> Environment: Solr 9.8.1, Ubuntu 22.04
> Reporter: Andrew Hankinson
> Priority: Major
>
> When using the JSON Request API, there seems to be no way to enable logging
> of the request parameters. This was discussed recently on the Solr users list.
> Unlike the "old" request API that uses the GET parameters for queries, the
> JSON Request API uses query parameters passed in the body of a POST command.
> This means that the log messages that use the JSON Request API, despite
> having search queries executed with the request, produces log messages like
> this:
> {code:java}
> 2025-06-23 07:05:48.036 INFO (qtp1844334363-56-null-95) [c: s: r:
> x:core_name t:null-95] o.a.s.c.S.Request webapp=/solr path=/select params={}
> hits=99 status=0 QTime=2400 {code}
> That is, the "params" element is always empty.
> Furthermore, even if this isn't desirable as the default behaviour, there
> seems to be no way to turn it on in. This makes debugging slow queries quite
> difficult, since it cannot be reproduced.
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