hadoop-hdfs-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Ravi Prakash <ravi...@ymail.com>
Subject Re: Documentation inconsistency about append write in HDFS
Date Mon, 03 Aug 2015 20:52:26 GMT
Thanks Thanh! Yes! Could you please post a patch?
 


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

 <!--#yiv9197574444 _filtered #yiv9197574444 {font-family:"MS Mincho";panose-1:2 2 6 9
4 2 5 8 3 4;} _filtered #yiv9197574444 {font-family:"Cambria Math";panose-1:2 4 5 3 5 4 6
3 2 4;} _filtered #yiv9197574444 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;} _filtered
#yiv9197574444 {panose-1:2 2 6 9 4 2 5 8 3 4;}#yiv9197574444 #yiv9197574444 p.yiv9197574444MsoNormal,
#yiv9197574444 li.yiv9197574444MsoNormal, #yiv9197574444 div.yiv9197574444MsoNormal {margin:0cm;margin-bottom:.0001pt;font-size:11.0pt;font-family:"Calibri",
sans-serif;}#yiv9197574444 a:link, #yiv9197574444 span.yiv9197574444MsoHyperlink {color:#0563C1;text-decoration:underline;}#yiv9197574444
a:visited, #yiv9197574444 span.yiv9197574444MsoHyperlinkFollowed {color:#954F72;text-decoration:underline;}#yiv9197574444
span.yiv9197574444EmailStyle17 {font-family:"Calibri", sans-serif;color:windowtext;}#yiv9197574444
.yiv9197574444MsoChpDefault {font-family:"Calibri", sans-serif;} _filtered #yiv9197574444
{margin:72.0pt 72.0pt 72.0pt 72.0pt;}#yiv9197574444 div.yiv9197574444WordSection1 {}-->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)
  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?)

  
Mime
View raw message