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Posted to common-dev@hadoop.apache.org by "Junping Du (JIRA)" <ji...@apache.org> on 2019/02/22 10:45:02 UTC
[jira] [Resolved] (HADOOP-8468) Umbrella of enhancements to support
different failure and locality topologies
[ https://issues.apache.org/jira/browse/HADOOP-8468?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Junping Du resolved HADOOP-8468.
--------------------------------
Resolution: Fixed
> 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: New Feature
> Components: ha, io
> Affects Versions: 1.0.0, 2.0.0-alpha
> Reporter: Junping Du
> Assignee: Junping Du
> Priority: Major
> Attachments: HADOOP-8468-total-v3.patch, HADOOP-8468-total.patch, HVE User Guide on branch-1(draft ).pdf, HVE_Hadoop World Meetup 2012.pptx, Proposal for enchanced failure and locality topologies (revised-1.0).pdf, Proposal for enchanced failure and locality topologies.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.
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