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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-4452) getAdditionalBlock() can create multiple blocks if the client times out and retries.
Date Sat, 02 Feb 2013 00:24:13 GMT

     [ https://issues.apache.org/jira/browse/HDFS-4452?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Konstantin Shvachko updated HDFS-4452:

    Attachment: getAdditionalBlock.patch

Patch for trunk. Incorporated Cos's comments. Corrected couple comment and log messages, minor
code cleanup.
> getAdditionalBlock() can create multiple blocks if the client times out and retries.
> ------------------------------------------------------------------------------------
>                 Key: HDFS-4452
>                 URL: https://issues.apache.org/jira/browse/HDFS-4452
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 2.0.2-alpha
>            Reporter: Konstantin Shvachko
>            Assignee: Konstantin Shvachko
>            Priority: Critical
>         Attachments: getAdditionalBlock-branch2.patch, getAdditionalBlock.patch, getAdditionalBlock.patch,
getAdditionalBlock.patch, TestAddBlockRetry.java
> HDFS client tries to addBlock() to a file. If NameNode is busy the client can timeout
and will reissue the same request again. The two requests will race with each other in {{FSNamesystem.getAdditionalBlock()}},
which can result in creating two new blocks on the NameNode while the client will know of
only one of them. This eventually results in {{NotReplicatedYetException}} because the extra
block is never reported by any DataNode, which stalls file creation and puts it in invalid
state with an empty block in the middle.

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