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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4258) Rename of Being Written Files
Date Tue, 22 Jan 2013 21:40:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4258?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13560052#comment-13560052
] 

Daryn Sharp commented on HDFS-4258:
-----------------------------------

We're running into problems with parent directories being renamed and leases being held on
the new pathnames.  As long as a long-running process/daemon continues to renew its lease

This is a big patch, but does the file id present any security issues?  Can I brute force
access to files by guessing file ids?
                
> Rename of Being Written Files
> -----------------------------
>
>                 Key: HDFS-4258
>                 URL: https://issues.apache.org/jira/browse/HDFS-4258
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs-client, namenode
>    Affects Versions: 3.0.0
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Brandon Li
>         Attachments: HDFS-4258.patch, HDFS-4258.patch, HDFS-4258.patch, HDFS-4258.patch
>
>
> When a being written file or it's ancestor directories is renamed, the path in the file
lease is also renamed.  Then the writer of the file usually will fail since the file path
in the writer is not updated.
> Moreover, I think there is a bug as follow:
> # Client writes 0's to F_0="/foo/file" and writes 1's to F_1="/bar/file" at the same
time.
> # Rename /bar to /baz
> # Rename /foo to /bar
> Then, writing to F_0 will fail since /foo/file does not exist anymore but writing to
F_1 may succeed since /bar/file exits as a different file.  In such case, the content of /bar/file
could be partly 0's and partly 1's.

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