[
https://issues.apache.org/jira/browse/HDFS-11530?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16117145#comment-16117145
]
Kihwal Lee commented on HDFS-11530:
-----------------------------------
This breaks the existing {{chooseRandom()}} behavior. It used to pick from
maximum number of racks. When {{chooseRemoteRack()}} is called with more than
one replica, it used to pick from multiple racks if available. Now it is
random, so sometimes they end up in the same rack.
> 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
> Fix For: 3.0.0-alpha4
>
> Attachments: HDFS-11530.001.patch, HDFS-11530.002.patch,
> HDFS-11530.003.patch, HDFS-11530.004.patch, HDFS-11530.005.patch,
> HDFS-11530.006.patch, HDFS-11530.007.patch, HDFS-11530.008.patch,
> HDFS-11530.009.patch, HDFS-11530.010.patch, HDFS-11530.011.patch,
> HDFS-11530.012.patch, HDFS-11530.013.patch, HDFS-11530.014.patch,
> HDFS-11530.015.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.
--
This message was sent by Atlassian JIRA
(v6.4.14#64029)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
