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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-744) Support hsync in HDFS
Date Fri, 18 May 2012 20:39:07 GMT

    [ https://issues.apache.org/jira/browse/HDFS-744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13279166#comment-13279166
] 

Tsz Wo (Nicholas), SZE commented on HDFS-744:
---------------------------------------------

The new javac warning is

[WARNING] /home/jenkins/jenkins-slave/workspace/PreCommit-HDFS-Build/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DistributedFileSystem.java:[260,30]
[deprecation] createNonRecursive(org.apache.hadoop.fs.Path,org.apache.hadoop.fs.permission.FsPermission,java.util.EnumSet<org.apache.hadoop.fs.CreateFlag>,int,short,long,org.apache.hadoop.util.Progressable)
in org.apache.hadoop.fs.FileSystem has been deprecated

So, it is okay.

This is a significant change.  I think the patch is quite close.  I will take a look one more
time in details.  If you wants to review the patch, please do so.
                
> Support hsync in HDFS
> ---------------------
>
>                 Key: HDFS-744
>                 URL: https://issues.apache.org/jira/browse/HDFS-744
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: data-node, hdfs client
>            Reporter: Hairong Kuang
>            Assignee: Lars Hofhansl
>         Attachments: HDFS-744-trunk-v2.patch, HDFS-744-trunk-v3.patch, HDFS-744-trunk-v4.patch,
HDFS-744-trunk-v5.patch, HDFS-744-trunk.patch, hdfs-744-v2.txt, hdfs-744-v3.txt, hdfs-744.txt
>
>
> HDFS-731 implements hsync by default as hflush. As descriibed in HADOOP-6313, the real
expected semantics should be "flushes out to all replicas and all replicas have done posix
fsync equivalent - ie the OS has flushed it to the disk device (but the disk may have it in
its cache)." This jira aims to implement the expected behaviour.

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