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

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

View raw message