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https://issues.apache.org/jira/browse/HADOOP-15447?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jelmer Kuperus updated HADOOP-15447:
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Issue Type: Bug (was: Improvement)
> SwiftRestClient does not propertly close connections
> ----------------------------------------------------
>
> Key: HADOOP-15447
> URL: https://issues.apache.org/jira/browse/HADOOP-15447
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs/swift
> Affects Versions: 2.9.0, 2.6.5, 2.7.4, 3.0.2
> Reporter: Jelmer Kuperus
> Priority: Major
>
> On production the output of netstat -a showed a large number of connections
> to swift hosts in the CLOSE_WAIT and ESTABLISHED state
> The reason is that while the SwiftRestClient calls releaseConnection, because
> HTTP 1.1 is used, the connection is not closed by the http client. Because it
> could pipeline further requests to the same host:port in the same connection.
> One way to remedy this is to add a "Connection: close" header
> This article further explains the issue :
> https://doc.nuxeo.com/blog/using-httpclient-properly-avoid-closewait-tcp-connections/
>
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