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Posted to hdfs-issues@hadoop.apache.org by "Tanping Wang (JIRA)" <ji...@apache.org> on 2011/05/10 00:57:03 UTC

[jira] [Updated] (HDFS-1881) After taking snapshot (upgrade) on Federation, the current directory of data node is emtpy.

     [ https://issues.apache.org/jira/browse/HDFS-1881?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tanping Wang updated HDFS-1881:
-------------------------------

    Attachment: HDFS-1881.patch

The problem was that when doing upgrade for BlockPoolSliceStorage we were hard linking between incorrect directories.

> After taking snapshot (upgrade) on Federation,  the current directory of data node is emtpy.
> --------------------------------------------------------------------------------------------
>
>                 Key: HDFS-1881
>                 URL: https://issues.apache.org/jira/browse/HDFS-1881
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Tanping Wang
>            Assignee: Tanping Wang
>         Attachments: HDFS-1881.patch
>
>
> After taking a snapshot in Federation (by starting up namenode with option -upgrade), it appears that the current directory of data node does not contain the block files.  We have also verified that upgrading from 20 to Federation does not have this problem.

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