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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-744) Support hsync in HDFS
Date Thu, 10 May 2012 23:24:01 GMT

     [ https://issues.apache.org/jira/browse/HDFS-744?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Lars Hofhansl updated HDFS-744:
-------------------------------

    Attachment: HDFS-744-trunk-v2.patch

Patch that I tested against HBase.
(I post the required HBase changes on the linked jira.)

HBase starts up, I can flush, and compact tables.
I verified via debugger that the sync path is correctly triggered.

*Please* have a look. For users like us (Salesforce.com) this is an important data safety
feature.

                
> Support hsync in HDFS
> ---------------------
>
>                 Key: HDFS-744
>                 URL: https://issues.apache.org/jira/browse/HDFS-744
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>            Reporter: Hairong Kuang
>         Attachments: HDFS-744-trunk-v2.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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