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From "Karthik Kambatla (JIRA)" <j...@apache.org>
Subject [jira] [Moved] (HDFS-4009) WebHdfsFileSystem and HftpFileSystem don't need delegation tokens
Date Sat, 06 Oct 2012 00:26:03 GMT

     [ https://issues.apache.org/jira/browse/HDFS-4009?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Karthik Kambatla moved HADOOP-8852 to HDFS-4009:
------------------------------------------------

    Affects Version/s:     (was: 2.0.0-alpha)
                       2.0.0-alpha
                  Key: HDFS-4009  (was: HADOOP-8852)
              Project: Hadoop HDFS  (was: Hadoop Common)
    
> WebHdfsFileSystem and HftpFileSystem don't need delegation tokens
> -----------------------------------------------------------------
>
>                 Key: HDFS-4009
>                 URL: https://issues.apache.org/jira/browse/HDFS-4009
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>    Affects Versions: 2.0.0-alpha
>            Reporter: Tom White
>            Assignee: Karthik Kambatla
>         Attachments: hadoop-8852.patch, hadoop-8852.patch, hadoop-8852-v1.patch
>
>
> Parent JIRA to track the work of removing delegation tokens from these filesystems. 
> This JIRA has evolved from the initial issue of these filesystems not stopping the DelegationTokenRenewer
thread they were creating.
> After further investigation, Daryn pointed out - "If you can get a token, you don't need
a token"! Hence, these filesystems shouldn't use delegation tokens.
> Evolution of the JIRA is listed below:
> Update 2:
> DelegationTokenRenewer is not required. The filesystems that are using it already have
Krb tickets and do not need tokens. Remove DelegationTokenRenewer and all the related logic
from WebHdfs and Hftp filesystems.
> Update1:
> DelegationTokenRenewer should be Singleton - the instance and renewer threads should
be created/started lazily. The filesystems using the renewer shouldn't need to explicity start/stop
the renewer, and only register/de-register for token renewal.
> Initial issue:
> HftpFileSystem and WebHdfsFileSystem should stop the DelegationTokenRenewer thread when
they are closed. 

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