[jira] [Reopened] (HDFS-4353) Encapsulate connections to peers in Peer and PeerServer classes

["Tsz Wo (Nicholas), SZE (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-4353?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tsz Wo (Nicholas), SZE reopened HDFS-4353:
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Reopen for reverting this and HDFS-4352.
                
> Encapsulate connections to peers in Peer and PeerServer classes
> ---------------------------------------------------------------
>
>                 Key: HDFS-4353
>                 URL: https://issues.apache.org/jira/browse/HDFS-4353
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode, hdfs-client
>    Affects Versions: 2.0.3-alpha
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>             Fix For: 3.0.0
>
>         Attachments: 02b-cumulative.patch, 02c.patch, 02c.patch, 02-cumulative.patch, 02d.patch, 02e.patch, 02f.patch
>
>
> Encapsulate connections to peers into the {{Peer}} and {{PeerServer}} classes.  Since many Java classes may be involved with these connections, it makes sense to create a container for them.  For example, a connection to a peer may have an input stream, output stream, readablebytechannel, encrypted output stream, and encrypted input stream associated with it.
> This makes us less dependent on the {{NetUtils}} methods which use {{instanceof}} to manipulate socket and stream states based on the runtime type.  it also paves the way to introduce UNIX domain sockets which don't inherit from {{java.net.Socket}}.

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