Shawn Heisey created SOLR-16597:
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Summary: Give Solr executors a config option to use daemon threads
Key: SOLR-16597
URL: https://issues.apache.org/jira/browse/SOLR-16597
Project: Solr
Issue Type: Task
Security Level: Public (Default Security Level. Issues are Public)
Affects Versions: 9.1
Reporter: Shawn Heisey
Assignee: Shawn Heisey
Http2SolrClient, using the Jetty httpclient creates threads that are not Daemon
threads. If the main method exits without closing the SolrClient, those
threads stay running and so the program never ends.
The old HttpSolrClient, using Apache httpclient, works as expected, so I think
that http client is likely creating daemon threads.
Talking with the Jetty project, I learned there is a way to have those threads
created as daemon threads. The pool object has a "setDaemon" method. But I
have not been able to figure out how to access the pool object to set that
parameter. I was informed that our executor wrappers lack the configuration
option to do this.
This issue is where I will figure out how to make this aspect of an executor
configurable and implement it so Http2SolrClient works as expected. If
somebody can point me in the right direction, I would greatly appreciate it. I
do not want to have our executor always create Daemon threads ... that should
be configurable, and default to false as the current code does.
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