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