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Posted to hdfs-dev@hadoop.apache.org by "Owen O'Malley (JIRA)" <ji...@apache.org> on 2012/10/10 07:27:03 UTC
[jira] [Resolved] (HDFS-4009) WebHdfsFileSystem and HftpFileSystem
don't need delegation tokens
[ https://issues.apache.org/jira/browse/HDFS-4009?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Owen O'Malley resolved HDFS-4009.
---------------------------------
Resolution: Won't Fix
This is a feature, not a bug.
In particular, if your kerberos ticket has 1 hour left, the application will fail without a token. In tools that copy large amounts of data using the http filesystem, this happens relatively often.
> 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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