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From "GAO Rui (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7661) [umbrella] support hflush and hsync for erasure coded files
Date Mon, 11 Apr 2016 08:11:25 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7661?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15234667#comment-15234667
] 

GAO Rui commented on HDFS-7661:
-------------------------------

Thanks for your comments, [~drankye],[~tlipcon],[~zhz],[~walter.k.su].

I am totally agree that we should not let this JIRA block the 3.0 release. We could  make
hflush/hsync of EC files as TO-BE-IMPLEMENTED, and release 3.0 .   For the future phrase,
along with the new decode/encode library and hardware support of EC,  maybe we could use striped
EC instead of replication as the default and major file format of HDFS. The function of hflush/hsync
would become necessary, so [~liuml07] and I may should continue to implement hflush/hsync
based on the latest design. We would break down this JIRA to several sub tasks and solved
them one by one. :D

> [umbrella] support hflush and hsync for erasure coded files
> -----------------------------------------------------------
>
>                 Key: HDFS-7661
>                 URL: https://issues.apache.org/jira/browse/HDFS-7661
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: erasure-coding
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: GAO Rui
>         Attachments: EC-file-flush-and-sync-steps-plan-2015-12-01.png, HDFS-7661-unitTest-wip-trunk.patch,
HDFS-7661-wip.01.patch, HDFS-EC-file-flush-sync-design-v20160323.pdf, HDFS-EC-file-flush-sync-design-version1.1.pdf,
Undo-Log-Design-20160406.jpg
>
>
> We also need to support hflush/hsync and visible length. 



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