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From "Yiqun Lin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11530) Use HDFS specific network topology to choose datanode in BlockPlacementPolicyDefault
Date Thu, 30 Mar 2017 11:43:41 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11530?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15948903#comment-15948903
] 

Yiqun Lin commented on HDFS-11530:
----------------------------------

Thanks [~vagarychen] for the comments.
I take some time to looked into this. I picked up one other type test failure {{TestDatanodeRegistration#testChangeIpcPort}}
to have a debug. The removing node operation is failed if the node registers to namenode again
with different node name. Maybe this test failure leads other test failed.
[~vagarychen], could you share your thought of this or we can file a new JIRA to have a track
to cover this case? It seems there are still some works we should do before making {{DFSNetworkTopology}}
as the default NetworkTopology {{NetworkTopology}}.

In addition, I am thinking if we use {{DFSNetworkTopology}} as the default class, is that
mean the other subclass of {{NetworkTopology}}(e.g. NetworkTopologyWithNodeGroup) will be
not allowed used in HDFS?

> Use HDFS specific network topology to choose datanode in BlockPlacementPolicyDefault
> ------------------------------------------------------------------------------------
>
>                 Key: HDFS-11530
>                 URL: https://issues.apache.org/jira/browse/HDFS-11530
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>    Affects Versions: 3.0.0-alpha2
>            Reporter: Yiqun Lin
>            Assignee: Yiqun Lin
>         Attachments: HDFS-11530.001.patch, HDFS-11530.002.patch
>
>
> The work for {{chooseRandomWithStorageType}} has been merged in HDFS-11482. But this
method is contained in new topology {{DFSNetworkTopology}} which is specified for HDFS. We
should update this and let {{BlockPlacementPolicyDefault}} use the new way since the original
way is inefficient.



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