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From "haosdent (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5954) Allow proper fsync support for HBase
Date Fri, 30 Aug 2013 12:46:56 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13754654#comment-13754654
] 

haosdent commented on HBASE-5954:
---------------------------------

[~xieliang007]Because there is only have a journal file on every disk in extN, the system
will commit all files metadata transactions when we open write barrier. After flush all files
metadata transactions to the journal file in physics disk, the system will flush data(both
metadata and block) of the special file to disk. So the fsync would spent more time when we
have a lot of IO in a disk. My weibo is http://weibo.com/haosdent , welcome for more discussion.
:-)
                
> Allow proper fsync support for HBase
> ------------------------------------
>
>                 Key: HBASE-5954
>                 URL: https://issues.apache.org/jira/browse/HBASE-5954
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>            Priority: Critical
>             Fix For: 0.98.0
>
>         Attachments: 5954-trunk-hdfs-trunk.txt, 5954-trunk-hdfs-trunk-v2.txt, 5954-trunk-hdfs-trunk-v3.txt,
5954-trunk-hdfs-trunk-v4.txt, 5954-trunk-hdfs-trunk-v5.txt, 5954-trunk-hdfs-trunk-v6.txt,
hbase-hdfs-744.txt
>
>
> At least get recommendation into 0.96 doc and some numbers running w/ this hdfs feature
enabled.

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