[CASSANDRA-3250] fsync the directory after new sstable or commit log segment are created

• Type: Bug
• Status: Resolved
• Priority: Low
• Resolution: Fixed
• Fix Version/s: 1.1.0
• Severity: Low
• Assignee: Pavel Yaskevich
• Reporter: Zhu Han

Authors

Pavel Yaskevich

Reviewers

Jonathan Ellis

• Created: 23/Sep/11 14:39
• Updated: 16/Apr/19 09:32
• Resolved: 19/Dec/11 23:50

Description

The mannual of fsync said:

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

Issue Links

• relates to: HDFS-5042 Completed files lost after power failure