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Summary: Documentation of Hadoop 2.x is outdated about append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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