[jira] [Created] (HDFS-8852) Documentation of Hadoop 2.x is outdated about append write support

["Hong Dai Thanh (JIRA)" <ji...@apache.org>]

Hong Dai Thanh created HDFS-8852:
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             Summary: Documentation of Hadoop 2.x is outdated about append write support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


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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