Thanks Thanh! Yes! Could you please post a patch?
 

     On Sunday, August 2, 2015 8:50 PM, Thanh Hong Dai <hdth...@tma.com.vn> 
wrote:
   

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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 version 2.x), 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 this JIRA 
(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 most recent change? (Or will 
append write be deprecated or is it not ready for production use?)

  

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