[
https://issues.apache.org/jira/browse/KAFKA-3968?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Ismael Juma updated KAFKA-3968:
-------------------------------
Labels: reliability (was: )
> fsync() is not called on parent directory when new FileMessageSet is flushed
> to disk
> ------------------------------------------------------------------------------------
>
> Key: KAFKA-3968
> URL: https://issues.apache.org/jira/browse/KAFKA-3968
> Project: Kafka
> Issue Type: Bug
> Components: log
> Affects Versions: 0.9.0.1, 0.10.0.0
> Environment: Linux, ext4 filesystem
> Reporter: Andrey Neporada
> Labels: reliability
>
> Kafka does not call fsync() on directory when new log segment is created and
> flushed to disk.
> The problem is that following sequence of calls doesn't guarantee file
> durability:
> fd = open("log", O_RDWR | O_CREATE); // suppose open creates "log"
> write(fd);
> fsync(fd);
> If system crashes after fsync() but before parent directory have been flushed
> to disk, the log file can disappear.
> This is true at least for ext4 on Linux.
> Proposed solution is to flush directory when flush() is called for the first
> time.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
