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From Shawn Heisey <apa...@elyograg.org>
Subject Can the connection pool be shut down in any way other than explicitly closing?
Date Tue, 18 Jul 2017 12:46:08 GMT
I have a user on the solr-user mailing list who is running into an
exception from HttpClient:

Caused by: java.lang.IllegalStateException: Connection pool shut down at
org.apache.http.util.Asserts.check(Asserts.java:34) at
org.apache.http.pool.AbstractConnPool.lease(AbstractConnPool.java:184)
at
org.apache.http.pool.AbstractConnPool.lease(AbstractConnPool.java:217)
at
org.apache.http.impl.conn.PoolingClientConnectionManager.requestConnection(PoolingClientConnectionManager.java:184)
at
org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:415)
at
org.apache.http.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:882)
at
org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
at
org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:55)
at
org.apache.solr.client.solrj.impl.HttpSolrClient.executeMethod(HttpSolrClient.java:515)
at
org.apache.solr.client.solrj.impl.HttpSolrClient.request(HttpSolrClient.java:279)
at
org.apache.solr.client.solrj.impl.HttpSolrClient.request(HttpSolrClient.java:268)
at
org.apache.solr.client.solrj.impl.LBHttpSolrClient.doRequest(LBHttpSolrClient.java:447)
... 24 more

They are using a SolrJ object called CloudSolrClient.  This in turn uses
LBHttpSolrClient, which uses HttpSolrClient, and inside THAT class,
HttpClient is used.

What I'd like to know is whether the connection pool can ever be shut
down *without* explicitly calling close/shutdown ... by some kind of
error, perhaps.  I suspect that they are calling an explicit action to
shut down either the solr client or the HttpClient, but I don't want to
say that before I ask whether it can happen any other way.

Thanks,
Shawn


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