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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7634) Lazy persist (memory) file should not support truncate currently
Date Mon, 19 Jan 2015 19:44:35 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7634?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14282927#comment-14282927
] 

Konstantin Shvachko commented on HDFS-7634:
-------------------------------------------

Looks good. Only you don't need to assign file twice. You first assign it using asFile(),
then using INodeFile.valueOf().

> Lazy persist (memory) file should not support truncate currently
> ----------------------------------------------------------------
>
>                 Key: HDFS-7634
>                 URL: https://issues.apache.org/jira/browse/HDFS-7634
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode, namenode
>            Reporter: Yi Liu
>            Assignee: Yi Liu
>             Fix For: 3.0.0
>
>         Attachments: HDFS-7634.001.patch
>
>
> Similar with {{append}}, lazy persist (memory) file should not support truncate currently.
Quote the reason from HDFS-6581 design doc:
> {quote}
> Appends to files created with the LAZY_PERSISTflag will not be allowed in the initial
implementation to avoid the complexity of keeping in­memory and on­disk replicas in sync
on a given DataNode.
> {quote}



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