hadoop-hdfs-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Jan Kunigk (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-4089) SyncBehindWrites uses wrong flags on sync_file_range
Date Fri, 19 Oct 2012 21:28:11 GMT
Jan Kunigk created HDFS-4089:
--------------------------------

             Summary: SyncBehindWrites uses wrong flags on sync_file_range
                 Key: HDFS-4089
                 URL: https://issues.apache.org/jira/browse/HDFS-4089
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: data-node, ha
            Reporter: Jan Kunigk
            Priority: Minor


Hi, I stumbled upon this while trying to understand the append design recently. I am assuming
when SyncBehindWrites is enabled we do indeed want to do a complete sync after each write.
In that case the implementation seems wrong to me.

Here's a comment from the manpage of sync_file_range on the usage of the SYNC_FILE_RANGE_WRITE
flag in solitude: "This is an asynchronous flush-to-disk operation. This is not suitable for
data integrity operations." I don't know why this syscall is invoked here instead of just
fsync

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira

Mime
View raw message