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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5954) Allow proper fsync support for HBase
Date Sat, 15 Dec 2012 05:26:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13532941#comment-13532941
] 

Lars Hofhansl commented on HBASE-5954:
--------------------------------------

We can make this arbitrarily complicated. :)

A flush or deferred log flush gets us pretty far. It'll flush the data to the data nodes,
which will then asynchronously (but ASAP) flush it to the OS buffers. In Linux the dirty page
cache is periodically flushed to disk (that can be configured - default is 30s). I am not
sure what else you want?

sync'ing only really makes sense (IMHO) when it is done synchronously.

                
> 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
>         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
>
>


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