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https://issues.apache.org/jira/browse/SOLR-13245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16767228#comment-16767228
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Joel Bernstein commented on SOLR-13245:
---------------------------------------
One thing to add, this bug only occurs if there a two replicas from the same
collection on that Solr instance that the daemon is sent to.
So another work around or possibly we can call it a best practice is to create
a worker collection specifically to run daemons which does not have multiple
replicas collocated on the same Solr instance.
> Status checking of streaming "daemon"-s is buggy and misleading
> ---------------------------------------------------------------
>
> Key: SOLR-13245
> URL: https://issues.apache.org/jira/browse/SOLR-13245
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: streaming expressions
> Affects Versions: 7.7, 8.0, master (9.0)
> Reporter: Andrzej Bialecki
> Priority: Major
>
> When a {{daemon}} is started Solr randomly picks a replica to process that
> request and then it executes in the context of that particular replica. The
> response from the request mentions this specifically:
> {code:java}
> {
> "result-set":{
> "docs":[{
> "DaemonOp":"Deamon:testD1 started on
> gettingstarted_shard2_replica_n6"}
> ,{
> "EOF":true}]}}
> {code}
> Subsequent requests to {{/solr/gettingstarted/stream?action=list}} only
> sometimes return the status of this daemon, specifically only when the
> request is randomly routed to the actual replica that the daemon is running
> on - in other cases the response doesn't show the running daemon.
> This is very easy to reproduce using the {{cloud}} example with 2 (local)
> nodes and a source collection with multiple shards and multiple replicas.
> Currently the only workaround is to request the status using a non-cloud core
> URL - in this case a request to
> {{/solr/gettingstarted_shard2_replica_n6/stream?action=list}} always returns
> correct status.
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