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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-7788) Post-2.6 namenode may not start up with an image containing inodes created with an old release.
Date Thu, 19 Feb 2015 20:23:13 GMT

     [ https://issues.apache.org/jira/browse/HDFS-7788?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kihwal Lee updated HDFS-7788:
-----------------------------
    Attachment: rushabh.patch

I turned Rushabh's patch into "binary" patch using the regular diff. Let's see if the precommit
can handle this.

> Post-2.6 namenode may not start up with an image containing inodes created with an old
release.
> -----------------------------------------------------------------------------------------------
>
>                 Key: HDFS-7788
>                 URL: https://issues.apache.org/jira/browse/HDFS-7788
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Kihwal Lee
>            Assignee: Rushabh S Shah
>            Priority: Blocker
>         Attachments: HDFS-7788-binary.patch, rushabh.patch
>
>
> Before HDFS-4305, which was fixed in 2.1.0-beta, clients could specify arbitrarily small
preferred block size for a file including 0. This was normally done by faulty clients or failed
creates, but it was possible.
> Until 2.5, reading a fsimage containing inodes with 0 byte preferred block size was allowed.
So if a fsimage contained such an inode, the namenode would come up fine.  In 2.6, the preferred
block size is required be > 0. Because of this change, the image that worked with 2.5 may
not work with 2.6.
> If a cluster ran a version of hadoop earlier than 2.1.0-beta before, it is under this
risk even if it worked fine with 2.5.



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