[jira] [Commented] (HDFS-8852) HDFS architecture documentation of version 2.x is outdated about append write support

["Ajith S (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-8852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14661219#comment-14661219 ] 

Ajith S commented on HDFS-8852:
-------------------------------

May be we can update it to "Appending the content to files is supported at the end but cannot by updated at arbitrary point and it is also not possible to have multiple writers. Files can only be written by a single writer."

> HDFS architecture documentation of version 2.x is outdated about append write support
> -------------------------------------------------------------------------------------
>
>                 Key: HDFS-8852
>                 URL: https://issues.apache.org/jira/browse/HDFS-8852
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: documentation
>            Reporter: Hong Dai Thanh
>            Assignee: Ajith S
>              Labels: newbie
>
> In the [latest version of the documentation|http://hadoop.apache.org/docs/current2/hadoop-project-dist/hadoop-hdfs/HdfsDesign.html#Simple_Coherency_Model], and also documentation for all releases with version 2, it’s mentioned that “A file once created, written, and closed need not be changed. “ and “There is a plan to support appending-writes to files in the future.” 
>  
> However, as far as I know, HDFS has supported append write since 0.21, based on [HDFS-265|https://issues.apache.org/jira/browse/HDFS-265] and [the old version of the documentation in 2012|https://web.archive.org/web/20121221171824/http://hadoop.apache.org/docs/hdfs/current/hdfs_design.html#Appending-Writes+and+File+Syncs]
> Various posts on the Internet also suggests that append write has been available in HDFS, and will always be available in Hadoop version 2 branch.
>  
> Can we update the documentation to reflect the current status?
> (Please also review whether the documentation should also be updated for version 0.21 and above, and the version 1.x branch)



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