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https://issues.apache.org/jira/browse/HDFS-11998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16056705#comment-16056705
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Chen Liang commented on HDFS-11998:
-----------------------------------
{{TestAvailableSpaceBlockPlacementPolicy}} fails because
{{AvailableSpaceBlockPlacementPolicy}} only rewrites chooseDataNode(...) for
it's optimization purpose. However the caller of this function in
{{BlockPlacementPolicyDefault#chooseRandom()}} has changed to call
chooseDataNode(…, type) on {{DFSNetworkTopology}}, this bypasses the change
that AvailableSpaceBlockPlacementPolicy has made in chooseDataNode(...), thus
invalidated its change. Need to also overwrite chooseDataNode(..., type) in
AvailableSpaceBlockPlacementPolicy. I've made the change locally which seems to
have solved the test failure. Will post next patch after the other test failure
gets resolved.
> Enable DFSNetworkTopology as default
> ------------------------------------
>
> Key: HDFS-11998
> URL: https://issues.apache.org/jira/browse/HDFS-11998
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Reporter: Chen Liang
> Assignee: Chen Liang
> Attachments: HDFS-11998.001.patch
>
>
> HDFS-11530 has made it configurable to use {{DFSNetworkTopology}}, and still
> uses {{NetworkTopology}} as default.
> Given the stress testing in HDFS-11923 which shows the correctness of
> DFSNetworkTopology, and the performance testing in HDFS-11535 which shows how
> DFSNetworkTopology can outperform NetworkTopology. I think we are at the
> point where I can and should enable DFSNetworkTopology as default.
> Any comments/thoughts are more than welcome!
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