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Date: Thu, 30 Mar 2017 11:43:41 +0000 (UTC)
From: "Yiqun Lin (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-11530) Use HDFS specific network topology
 to choose datanode in BlockPlacementPolicyDefault
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archived-at: Thu, 30 Mar 2017 11:43:47 -0000


    [ 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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