Hi Thanh, Thanks for bringing it up. Append is available in 2.x releases as you pointed out and is production-ready.
Can you please file a doc bug at https://issues.apache.org/jira/browse/HADOOP? On Aug 2, 2015, at 8:49 PM, Thanh Hong Dai <[email protected]<mailto:[email protected]>> wrote: 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 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<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?)
