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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-8470) Implementation of 4-layer subclass of NetworkTopology (NetworkTopologyWithNodeGroup)
Date Mon, 03 Jun 2013 04:07:20 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-8470?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tsz Wo (Nicholas), SZE updated HADOOP-8470:
-------------------------------------------

       Resolution: Fixed
    Fix Version/s:     (was: 3.0.0)
                   2.1.0-beta
           Status: Resolved  (was: Patch Available)

Merged this to branch-2.
                
> Implementation of 4-layer subclass of NetworkTopology (NetworkTopologyWithNodeGroup)
> ------------------------------------------------------------------------------------
>
>                 Key: HADOOP-8470
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8470
>             Project: Hadoop Common
>          Issue Type: Sub-task
>    Affects Versions: 1.0.0, 2.0.0-alpha
>            Reporter: Junping Du
>            Assignee: Junping Du
>             Fix For: 2.1.0-beta, 1.2.0
>
>         Attachments: HADOOP-8470-branch-2.patch, HADOOP-8470-NetworkTopology-new-impl.patch,
HADOOP-8470-NetworkTopology-new-impl-v2.patch, HADOOP-8470-NetworkTopology-new-impl-v3.patch,
HADOOP-8470-NetworkTopology-new-impl-v4.patch
>
>
> To support the four-layer hierarchical topology shown in attached figure as a subclass
of NetworkTopology, NetworkTopologyWithNodeGroup was developed along with unit tests. NetworkTopologyWithNodeGroup
overriding the methods add, remove, and pseudoSortByDistance were the most relevant to support
the four-layer topology. The method seudoSortByDistance selects the nodes to use for reading
data and sorts the nodes in sequence of node-local, nodegroup-local, rack- local, rack–off.
Another slightly change to seudoSortByDistance is to support cases of separation data node
and node manager: if the reader cannot be found in NetworkTopology tree (formed by data nodes
only), then it will try to sort according to reader's sibling node in the tree.
> The distance calculation changes the weights from 0 (local), 2 (rack- local), 4 (rack-off)
to: 0 (local), 2 (nodegroup-local), 4 (rack-local), 6 (rack-off).
> The additional node group layer should be specified in the topology script or table mapping,
e.g. input 10.1.1.1, output: /rack1/nodegroup1
> A subclass on InnerNode, InnerNodeWithNodeGroup, was also needed to support NetworkTopologyWithNodeGroup.

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