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https://issues.apache.org/jira/browse/HADOOP-5945?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12715842#action_12715842
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He Yongqiang commented on HADOOP-5945:
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>>The big issue is what do you gain by running >1 TT and DN per node, except on
>>testing, where you want to give the master nodes more of a workload?
Talked with one friend. And he said hdfs is used in the production environment
as a catoon video store. And only one datanode server per node can not fully
utilize the node's resources.
>>virtual machines
Good suggestions. One datanode server per vm, i guess it need special care to
avoid all replicas of one file block be put on the same physical machine.
I think letting mutiple tasktrackers running on a same node is not a good
desicion due to the memory problem. But if only the hdfs is used, why not
supporting multiple datanodes on a single node?
>>DataNodeCluster
Hairong, thanks. I will try it. Agreed with Jakob, we should put it in the
documentation. But it seems DataNodeCluster is only used for test?
> Support running multiple DataNodes/TaskTrackers simultaneously in a single
> node
> -------------------------------------------------------------------------------
>
> Key: HADOOP-5945
> URL: https://issues.apache.org/jira/browse/HADOOP-5945
> Project: Hadoop Core
> Issue Type: New Feature
> Reporter: He Yongqiang
>
> We should support multiple datanodes/tasktrackers running at a same node,
> only if they do not share same port/local fs dir etc. I think Hadoop can be
> easily adapted to meet this.
> I guess at first and the major step is that we should modify the script to
> let it support startting multiple datanode/tasktracker daemons in a same node.
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