Jelmer Kuperus created HADOOP-15447:
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Summary: SwiftRestClient does not propertly close connections
Key: HADOOP-15447
URL: https://issues.apache.org/jira/browse/HADOOP-15447
Project: Hadoop Common
Issue Type: Improvement
Components: fs/swift
Affects Versions: 3.0.2, 2.7.4, 2.6.5, 2.9.0
Reporter: Jelmer Kuperus
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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