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From "Dmytro Molkov (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1357) HFTP traffic served by DataNode shouldn't use service port on NameNode
Date Wed, 01 Sep 2010 00:16:56 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1357?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12904845#action_12904845

Dmytro Molkov commented on HDFS-1357:

The patch looks good to me.

Keep in mind though that I have an outstanding patch HDFS-1291 that will only open the client
port on the namenode once it is out of safemode.
Thus HFTP will not be accessible until the namenode is fully up. Which can actually be a good
thing because we are preventing clients from hitting the namenode when it is starting up.

> HFTP traffic served by DataNode shouldn't use service port on NameNode 
> -----------------------------------------------------------------------
>                 Key: HDFS-1357
>                 URL: https://issues.apache.org/jira/browse/HDFS-1357
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: data-node, security
>            Reporter: Kan Zhang
>            Assignee: Kan Zhang
>         Attachments: h1357-01.patch
> HDFS-599 introduced a new service port on NameNode to separate system traffic (e.g.,
heartbeats/blockreports) from client file access requests so that they can be prioritized.
 All Datanode traffic now goes to the service port. However, datanode also serves as a proxy
for HFTP requests from client (served by StreamFile servlet). These HFTP traffic should continue
to use the client port on NameNode. Moreover, using the service port for HFTP is incompatible
with the existing way of selecting delegation tokens.

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