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From "Pavel Yaskevich (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-3250) fsync the directory after new sstable or commit log segment are created
Date Sat, 17 Dec 2011 14:36:31 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-3250?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Pavel Yaskevich updated CASSANDRA-3250:
---------------------------------------

    Attachment:     (was: CASSANDRA-3250-v2.patch)
    
> fsync the directory after new sstable or commit log segment are created
> -----------------------------------------------------------------------
>
>                 Key: CASSANDRA-3250
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3250
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Zhu Han
>            Assignee: Pavel Yaskevich
>            Priority: Minor
>             Fix For: 1.0.7
>
>         Attachments: CASSANDRA-3250-v2.patch, CASSANDRA-3250.patch
>
>
> The mannual of fsync said:
> bq.   Calling  fsync()  does  not  necessarily  ensure  that  the entry in the directory
containing the file has also reached disk.  For that an explicit fsync() on a file descriptor
for the directory is also needed.
> At least on ext4, syncing the directory is a must to have step, as described by [1].
Otherwise, the new sstables or commit logs could be missed after crash even if itself is synced.

> Unfortunately, JVM does not provide an approach to sync the directory...
> [1] http://www.linuxfoundation.org/news-media/blogs/browse/2009/03/don%E2%80%99t-fear-fsync

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