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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8240) Allow users to specify a checksum type on create()
Date Wed, 14 Nov 2012 14:44:13 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13497130#comment-13497130
] 

Kihwal Lee commented on HADOOP-8240:
------------------------------------

Thanks, Uma for pointing this out.  I will take a look and file a jira if necessary. BlockScan
on those blocks become less useful as you said, but it may still cover certain rare failure
modes. Anyways, we may be able to optimize it.
                
> Allow users to specify a checksum type on create()
> --------------------------------------------------
>
>                 Key: HADOOP-8240
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8240
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs
>    Affects Versions: 0.23.0
>            Reporter: Kihwal Lee
>            Assignee: Kihwal Lee
>             Fix For: 0.23.3, 2.0.2-alpha
>
>         Attachments: hadoop-8240-branch-0.23-alone.patch.txt, hadoop-8240.patch, hadoop-8240-post-hadoop-8700-br2-trunk.patch.txt,
hadoop-8240-post-hadoop-8700-br2-trunk.patch.txt, hadoop-8240-trunk-branch2.patch.txt, hadoop-8240-trunk-branch2.patch.txt,
hadoop-8240-trunk-branch2.patch.txt
>
>
> Per discussion in HADOOP-8060, a way for users to specify a checksum type on create()
is needed. The way FileSystem cache works makes it impossible to use dfs.checksum.type to
achieve this. Also checksum-related API is at Filesystem-level, so we prefer something at
that level, not hdfs-specific one.  Current proposal is to use CreatFlag.

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