[HDFS-11846] Ozone: Fix Http connection leaks in ozone clients

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: HDFS-7240
• Component/s: ozone
• Target Version/s: HDFS-7240
• Hadoop Flags: Reviewed
• Assignee: Weiwei Yang
• Reporter: Weiwei Yang
• Created: 18/May/17 02:43
• Updated: 26/Apr/18 21:50
• Resolved: 24/May/17 19:37

Description

There are several problems

1. Http clients in OzoneVolume, OzoneBucket and OzoneClient are created per request, per Reuse of HttpClient instance doc, proposed to reuse the http client instance to reduce the over head.
2. Some resources in these classes were not properly cleaned up. E.g the http connection, HttpGet/HttpPost requests.

This jira's purpose is to fix these issues and investigate how we can improve the client.