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Posted to dev@kafka.apache.org by "Ismael Juma (JIRA)" <ji...@apache.org> on 2016/11/30 15:53:58 UTC
[jira] [Updated] (KAFKA-3968) fsync() is not called on parent
directory when new FileMessageSet is flushed to disk
[ 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.
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