[ 
https://issues.apache.org/jira/browse/SOLR-6239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14236864#comment-14236864
 ] 

Anton Kozak commented on SOLR-6239:
-----------------------------------

The issue is reproducible in case of high load, I see 4-5 exceptions in the log 
after full index rebuild:
2014-12-06 04:51:21,372 [pool-2-thr] [ERROR] 
c.c.r.w.c.r.index.impl.service.RebuildIndexServiceImpl ->run:188 - Unexpected 
exception has been thrown.
org.apache.solr.client.solrj.impl.HttpSolrServer$RemoteSolrException: 
Connection reset
        at 
org.apache.solr.client.solrj.impl.HttpSolrServer.executeMethod(HttpSolrServer.java:554)
 ~[solr-solrj-4.9.0.jar:4.9.0 1604085 - rmuir - 2014-06-20 06:34:04]
        at 
org.apache.solr.client.solrj.impl.HttpSolrServer.request(HttpSolrServer.java:210)
 ~[solr-solrj-4.9.0.jar:4.9.0 1604085 - rmuir - 2014-06-20 06:34:04]
        at 
org.apache.solr.client.solrj.impl.HttpSolrServer.request(HttpSolrServer.java:206)
 ~[solr-solrj-4.9.0.jar:4.9.0 1604085 - rmuir - 2014-06-20 06:34:04]
        at 
org.apache.solr.client.solrj.impl.LBHttpSolrServer.doRequest(LBHttpSolrServer.java:340)
 ~[solr-solrj-4.9.0.jar:4.9.0 1604085 - rmuir - 2014-06-20 06:34:04]
        at 
org.apache.solr.client.solrj.impl.LBHttpSolrServer.request(LBHttpSolrServer.java:301)
 ~[solr-solrj-4.9.0.jar:4.9.0 1604085 - rmuir - 2014-06-20 06:34:04]
        at 
org.apache.solr.client.solrj.impl.CloudSolrServer.request(CloudSolrServer.java:659)
 ~[solr-solrj-4.9.0.jar:4.9.0 1604085 - rmuir - 2014-06-20 06:34:04]
        at 
org.apache.solr.client.solrj.request.AbstractUpdateRequest.process(AbstractUpdateRequest.java:124)
 ~[solr-solrj-4.9.0.jar:4.9.0 1604085 - rmuir - 2014-06-20 06:34:04]

Is it any workaround for 4.9 version?

Thanks,
Anton

> HttpSolrServer: connection still allocated
> ------------------------------------------
>
>                 Key: SOLR-6239
>                 URL: https://issues.apache.org/jira/browse/SOLR-6239
>             Project: Solr
>          Issue Type: Bug
>          Components: clients - java
>            Reporter: Sergio Fernández
>            Priority: Minor
>
> In scenarios where concurrency is aggressive, this exception could easily 
> appear:
> {quote}
> org.apache.solr.client.solrj.impl.HttpSolrServer$RemoteSolrException: Invalid 
> use of BasicClientConnManager: connection still allocated.
> Make sure to release the connection before allocating another one.
>       at 
> org.apache.solr.client.solrj.impl.HttpSolrServer.executeMethod(HttpSolrServer.java:554)
>  ~[solr-solrj-4.9.0.jar:4.9.0 1604085 - rmuir - 2014-06-20 06:34:04]
>       at 
> org.apache.solr.client.solrj.impl.HttpSolrServer.request(HttpSolrServer.java:210)
>  ~[solr-solrj-4.9.0.jar:4.9.0 1604085 - rmuir - 2014-06-20 06:34:04]
>       at 
> org.apache.solr.client.solrj.impl.HttpSolrServer.request(HttpSolrServer.java:206)
>  ~[solr-solrj-4.9.0.jar:4.9.0 1604085 - rmuir - 2014-06-20 06:34:04]
>       at 
> org.apache.solr.client.solrj.request.AbstractUpdateRequest.process(AbstractUpdateRequest.java:124)
>  ~[solr-solrj-4.9.0.jar:4.9.0 1604085 - rmuir - 2014-06-20 06:34:04]
>       at org.apache.solr.client.solrj.SolrServer.add(SolrServer.java:116) 
> ~[solr-solrj-4.9.0.jar:4.9.0 1604085 - rmuir - 2014-06-20 06:34:04]
>       at org.apache.solr.client.solrj.SolrServer.add(SolrServer.java:102) 
> ~[solr-solrj-4.9.0.jar:4.9.0 1604085 - rmuir - 2014-06-20 06:34:04]
> {quote}
> I wonder if there is any solution for it?



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