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From "Aaron T. Myers (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3144) Refactor DatanodeID#getName by use
Date Sun, 01 Apr 2012 20:40:27 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3144?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13243846#comment-13243846
] 

Aaron T. Myers commented on HDFS-3144:
--------------------------------------

This is great cleanup, Eli. Thanks a lot for doing it. A few small comments. +1 once these
and the findbugs warning is explained or fixed.

# In UnregisteredNodeException, I wonder if you shouldn't just be using toString instead of
getXferAdder? Looks to me like it's going to be used just as a log message.
# Likewise seems like we should just use toString() in InvalidateBlocks#dump.
# To hopefully prevent these misuses of DatanodeID methods, maybe add a comment at the top
of DatanodeID explaining clearly when each should be used? e.g. "use toString() in log messages,
use dataXferPort for..., etc."
                
> 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, hdfs-3144.txt, 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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