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Date: Sun, 1 Apr 2012 04:19:04 +0000 (UTC)
From: "Eli Collins (Updated) (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Updated] (HDFS-3144) Refactor DatanodeID#getName by use
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     [ https://issues.apache.org/jira/browse/HDFS-3144?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eli Collins updated HDFS-3144:
------------------------------

    Attachment: hdfs-3144.txt

Patch attached.

DataNodeID#getName is no longer available. The following are introduced so each context in which we use the "name" has it's own method:
- getHostName - when the DN hostname is needed
- getIpAddr   - when the DN IP is needed
- getXferAddr - IP + xfer port (what getName returned)
- getIpcAddr  - IP + ipc port
- getInfoAddr - IP + info port
- toString    - for logging

DataNodeInfo#getName still implements Node#getName for topolgy since DatanodeID doesn't need to implement this interface. It returns DatanodeID#getXferAddr so the behavior is unchanged.
                
> Refactor DatanodeID#getName by use
> ----------------------------------
>
>                 Key: HDFS-3144
>                 URL: https://issues.apache.org/jira/browse/HDFS-3144
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: data-node
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>         Attachments: hdfs-3144.txt
>
>
> DatanodeID#getName, which returns a string containing the IP:xferPort of a Datanode, is used in a variety of contexts:
> # Putting the ID in a log message
> # Connecting to the DN for data transfer
> # Getting a string to use as a key (eg for comparison)
> # Using as a hostname, eg for excludes/includes, topology files
> Same for DatanodeID#getHost, which returns just the IP part, and sometimes we use it as a key, sometimes we tack on the IPC port, etc.
> Let's have a method for each use, eg toString can be used for #1, a new method (eg getDataXferAddr) for #2, a new method (eg getKey) for #3, new method (eg getHostID) for #4, etc. Aside from the code being more clear, we can change the value for particular uses, eg we can change the format in a log message without changing the address used that clients connect to the DN, or modify the address used for data transfer without changing the other uses.

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