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https://issues.apache.org/jira/browse/SOLR-17744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17948301#comment-17948301
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ASF subversion and git services commented on SOLR-17744:
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Commit aaf69dc99911edd38e9b4c9f85f8f8a8fc2d1874 in solr's branch
refs/heads/main from Chris M. Hostetter
[ https://gitbox.apache.org/repos/asf?p=solr.git;h=aaf69dc9991 ]
SOLR-17744: Fix AbstractCollectionsAPIDistributedZkTestBase.addReplicaTest to
check that replicas become active
This ensures internal recovery requests are not still in process when we try to
shutdown the cluster
> Solr shutdown does not graceful close Jetty requests/connections
> ----------------------------------------------------------------
>
> Key: SOLR-17744
> URL: https://issues.apache.org/jira/browse/SOLR-17744
> Project: Solr
> Issue Type: New Feature
> Reporter: Chris M. Hostetter
> Assignee: Chris M. Hostetter
> Priority: Major
> Fix For: main (10.0), 9.9
>
> Attachments: SOLR-17744-1.patch, SOLR-17744.patch
>
>
> Solr does a lot of work internally (via things like SolrCore reference
> counting) to ensure that we "finish" in-flight requests on orderly shutdown
> (ie: when the user has issued a "stop" command) – but it does not appear that
> we are doing anything to ensure that *Jetty* managed resources will also wait
> for in process requests to finish.
> In particular, Jetty seems to abruptly close any existing & active network
> connections to clients, even as Solr continues to process those requests and
> try to write out the responses.
> There are Jetty features to ensure that shutdown is genuinely "graceful"
> (refusing new requests while letting existing ones finish) but Solr doesn't
> appear to use/enable these features:
> * In Jetty 10 & 11, this is apparently done using the {{StatisticsHandler}}
> (as a wrapper around the main handler collection i think?)
> **
> [https://github.com/jetty/jetty.project/issues/2076#issuecomment-353578130]
> **
> [https://javadoc.jetty.org/jetty-11/org/eclipse/jetty/server/handler/StatisticsHandler.html]
> **
> [https://jetty.org/docs/jetty/11/programming-guide/server/http.html#handler-use-util-stats-handler]
> * In Jetty 12+ there is a {{graceful}} module that provides a
> {{GracefulHandler}} (which seems like a slightly more robust version of what
> {{StatisticsHandler}} does in jetty-10, but with less statistics tracking
> overhead)
> **
> [https://jetty.org/docs/jetty/12/operations-guide/start/index.html#stop-graceful]
> **
> [https://jetty.org/docs/jetty/12/operations-guide/modules/standard.html#graceful]
>
> The net result is that even during planned shutdown (or restart) of Solr
> nodes, clients can get lots of errors.
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