[SOLR-17086] v2 Backup and Replica creation: HTTP 500 error messages

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 9.4
• Component/s: Backup/Restore, v2 API
• Assignee: Jason Gerlowski
• Reporter: Hakan Özler
• Created: 28/Nov/23 10:04
• Updated: 18/Jan/24 22:35

Description

 I've encountered two problems related to the v2 API in 9.4.
 
1. Creating a backup [1] request using the v2 api directives sporadically returns `An exception was not mapped due to exception mapper failure. The HTTP 500 response will be returned` with the following stack trace. However, the backup process is always successfully completed. Here is an example backup request to produce this problem:

curl -i -L -X POST \
   -H "Content-Type:application/json" \
   -d \
'{
  "repository": "s3",
  "location": "level-1-folder/level-2-folder/",
  "async": "1",
}' \
 'https://solr.host/api/collections/collection-name/backups/folder-name/versions' 

Error trace:

java.lang.NullPointerException: Cannot invoke "org.apache.solr.request.SolrQueryRequest.getParams()" because "solrQueryRequest" is null
at org.apache.solr.handler.api.V2ApiUtils.getMediaTypeFromWtParam(V2ApiUtils.java:92)
at org.apache.solr.jersey.MediaTypeOverridingFilter.filter(MediaTypeOverridingFilter.java:64)
at org.glassfish.jersey.server.ContainerFilteringStage$ResponseFilterStage.apply(ContainerFilteringStage.java:172)
at org.glassfish.jersey.server.ContainerFilteringStage$ResponseFilterStage.apply(ContainerFilteringStage.java:139)
at org.glassfish.jersey.process.internal.Stages.process(Stages.java:147)
at org.glassfish.jersey.server.ServerRuntime$Responder.processResponse(ServerRuntime.java:378) 

 
2. Creating a replica [2] obviously has the same behavior. We're able to create a replica but we receive the message above at times. A snippet of an ADDREPLICA request:
 

curl -i -L -X POST \
   -H "Content-Type:application/json" \
   -d \
'{"type":"NRT", "async": "1"}' \
 'https://solr.host/api/collections/demo/shards/shard1/replicas' 

 
1. https://solr.apache.org/guide/solr/latest/deployment-guide/collection-management.html#backup
2. https://solr.apache.org/guide/solr/latest/deployment-guide/replica-management.html#addreplica