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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HDFS-1058) reading from file under construction fails if it reader beats writer to DN for new block
Date Mon, 22 Mar 2010 02:37:27 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1058?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated HDFS-1058:
------------------------------

    Issue Type: Sub-task  (was: Bug)
        Parent: HDFS-1060

> reading from file under construction fails if it reader beats writer to DN for new block
> ----------------------------------------------------------------------------------------
>
>                 Key: HDFS-1058
>                 URL: https://issues.apache.org/jira/browse/HDFS-1058
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: data-node, hdfs client
>    Affects Versions: 0.21.0, 0.22.0
>            Reporter: Todd Lipcon
>
> If there is a writer and concurrent reader, the following can occur:
> - The writer allocates a new block from the NN
> - The reader calls getBlockLocations
> - Reader connects to the DN and calls getReplicaVisibleLength
> - writer still has not talked to the DN, so DN doesn't know about the block and throws
an error

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