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Junping Du commented on HADOOP-8468: ------------------------------------ I start the work to backport NodeGroup-aware topology to branch-2, there are 7 patches below in Common & HDFS: patch 1 - HADOOP-8469: make NetworkTopology pluggable patch 2 - HADOOP-8470: implementation of NetworkTopologyWithNodeGroup patch 3 - HDFS-3498: Make BlockPlacementPolicyWithDefault extensible and Block Placement Removal policy extensible patch 4 - HDFS-3601: implementation of BlockPlacementPolicyWithNodeGroup patch 5 - HDFS-4240: fix a bug in nodegroup-aware case patch 6 - HDFS-3495: Make Balancer support node group layer patch 7 - HDFS-4261: Fix a timeout issue in TestBalancerWithNodeGroup case > 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: Improvement > Components: ha, io > Affects Versions: 1.0.0, 2.0.0-alpha > Reporter: Junping Du > Assignee: Junping Du > Attachments: HADOOP-8468-total.patch, HADOOP-8468-total-v3.patch, > HVE_Hadoop World Meetup 2012.pptx, HVE User Guide on branch-1(draft ).pdf, > Proposal for enchanced failure and locality topologies.pdf, Proposal for > enchanced failure and locality topologies (revised-1.0).pdf > > > 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 For more information on JIRA, see: http://www.atlassian.com/software/jira