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From "Junping Du (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-3495) Update Balancer to support new NetworkTopology with NodeGroup
Date Thu, 22 Nov 2012 10:03:00 GMT

     [ https://issues.apache.org/jira/browse/HDFS-3495?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Junping Du updated HDFS-3495:
-----------------------------

    Attachment: HADOOP-9045-v4.patch

Nicholas, I address all your comments in v4 patch. Great thanks for your review!
                
> Update Balancer to support new NetworkTopology with NodeGroup
> -------------------------------------------------------------
>
>                 Key: HDFS-3495
>                 URL: https://issues.apache.org/jira/browse/HDFS-3495
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: balancer
>    Affects Versions: 1.1.0, 2.0.2-alpha
>            Reporter: Junping Du
>            Assignee: Junping Du
>         Attachments: HADOOP-8473-Balancer-NodeGroup-aware.patch, HADOOP-9045-v4.patch,
HDFS-3495-v2.patch, HDFS-3495-v3.patch
>
>
> Since the Balancer is a Hadoop Tool, it was updated to be directly aware of four-layer
hierarchy instead of creating an alternative Balancer implementation. To accommodate extensibility,
a new protected method, doChooseNodesForCustomFaultDomain is now called from the existing
chooseNodes method so that a subclass of the Balancer could customize the balancer algotirhm
for other failure and locality topologies. An alternative option is to encapsulate the algorithm
used for the four-layer hierarchy into a collaborating strategy class.
> The key changes introduced to support a four-layer hierarchy were to override the algorithm
of choosing <source, target> pairs for balancing. Unit tests were created to test the
new algorithm.
> The algorithm now makes sure to choose the target and source node on the same node group
for balancing as the first priority. Then the overall balancing policy is: first doing balancing
between nodes within the same nodegroup then the same rack and off rack at last. Also, we
need to check no duplicated replicas live in the same node group after balancing.

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