hadoop-hdfs-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-681) A client should not send buffered data to datanodes on close of a file if the data have already been flushed
Date Wed, 07 Oct 2009 19:15:31 GMT
A client should not send buffered data to datanodes on close of a file if the data have already
been flushed
------------------------------------------------------------------------------------------------------------

                 Key: HDFS-681
                 URL: https://issues.apache.org/jira/browse/HDFS-681
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: Hairong Kuang


Suppose we have the following lines of pseducode:
{noformat}
1: DFSOutputstream out = dfs.create("file");
2: out.write("abc");
3: out.hflush("abc");
4: out.close();
{noformat}

Line 3 will force "abc" to be pushed to datanodes but "abc" are still kept in the buffer for
checksum purpose. Line 4 will force "abc" to be sent to datanodes again. If the client has
an additional check if the buffered data have been flushed or not, we can eliminate this unnecessary
packet. 

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message