hadoop-hdfs-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Jun Ping Du <...@vmware.com>
Subject Make Hadoop NetworkTopology and data locality more pluggable for other deploying topology like: virtualization.
Date Mon, 04 Jun 2012 15:48:35 GMT
Hello Folks,
      I just filed a Umbrella jira today to address current NetworkTopology issue that binding
strictly to three tier network. The motivation here is to make hadoop more flexible for deploying
topology (especially for cloud/virtualization case) and more configurable in data locality
related policies like: replica placement, task scheduling, choosing block for DFSClient reading,
      We submit a draft proposal in this Umbrella as well as the implementation code. As code
base is large (~260K), the code is separated into 7 sub JIRA issues which seems to be more
convenient for reviewing. However, we split the code based on functionality which cause some
dependencies between patches which way we are not sure the best. Welcome to provide comments
and suggestions on doc and code, and look forward to work with all of you to enhance hadoop
in some new situations towards perfect.
      Hope this is a good start.    



----- Original Message -----
From: "Junping Du (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
Sent: Monday, June 4, 2012 12:09:22 PM
Subject: [jira] [Created] (HADOOP-8468) Umbrella of enhancements to support different failure
and locality topologies

Junping Du created HADOOP-8468:

             Summary: Umbrella of enhancements to support different failure and locality topologies
                 Key: HADOOP-8468
                 URL: https://issues.apache.org/jira/browse/HADOOP-8468
             Project: Hadoop Common
          Issue Type: Bug
          Components: ha, io
    Affects Versions: 2.0.0-alpha, 1.0.0
            Reporter: Junping Du
            Assignee: Junping Du
            Priority: Critical

The current hadoop network topology (described in some previous issues like: Hadoop-692) works
well in classic three-tiers network when it comes out. However, it does not take into account
other failure models or changes in the infrastructure that can affect network bandwidth efficiency
like: virtualization. 
Virtualized platform has following genes that shouldn't been ignored by hadoop topology in
scheduling tasks, placing replica, do balancing or fetching block for reading: 
1. VMs on the same physical host are affected by the same hardware failure. In order to match
the reliability of a physical deployment, replication of data across two virtual machines
on the same host should be avoided.
2. The network between VMs on the same physical host has higher throughput and lower latency
and does not consume any physical switch bandwidth.
Thus, we propose to make hadoop network topology extend-able and introduce a new level in
the hierarchical topology, a node group level, which maps well onto an infrastructure that
is based on a virtualized environment.

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


View raw message