fsync the directory after new sstable or commit log segment are created
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Key: CASSANDRA-3250
URL: https://issues.apache.org/jira/browse/CASSANDRA-3250
Project: Cassandra
Issue Type: Bug
Reporter: Zhu Han
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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