Mailing-List: contact hdfs-issues-help@hadoop.apache.org; run by ezmlm
Precedence: bulk
Reply-To: hdfs-issues@hadoop.apache.org
Date: Tue, 5 Jun 2012 16:40:23 +0000 (UTC)
From: "Lars Hofhansl (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <1032458367.40052.1338914423565.JavaMail.jiratomcat@issues-vm>
In-Reply-To: 
 <467212993.9892.1301003525785.JavaMail.tomcat@hel.zones.apache.org>
Subject: [jira] [Updated] (HDFS-1783) Ability for HDFS client to write
 replicas in parallel
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit


     [ https://issues.apache.org/jira/browse/HDFS-1783?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Lars Hofhansl updated HDFS-1783:
--------------------------------

    Attachment: HDFS-1783-trunk-v4.patch

* added Stack's suggestions (thanks Stack):
* added subclasses of TestReplication and TestDatanodeDeath, that run all tests with parallel writes enabled
* found a problem with error handling (with TestDatanodeDeathWithParallelWrites), fixed it
* renamed s[] to sockets[]

                
> Ability for HDFS client to write replicas in parallel
> -----------------------------------------------------
>
>                 Key: HDFS-1783
>                 URL: https://issues.apache.org/jira/browse/HDFS-1783
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs client
>            Reporter: dhruba borthakur
>            Assignee: Lars Hofhansl
>         Attachments: HDFS-1783-trunk-v2.patch, HDFS-1783-trunk-v3.patch, HDFS-1783-trunk-v4.patch, HDFS-1783-trunk.patch
>
>
> The current implementation of HDFS pipelines the writes to the three replicas. This introduces some latency for realtime latency sensitive applications. An alternate implementation that allows the client to write all replicas in parallel gives much better response times to these applications. 

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira