Zhe Zhang commented on HDFS-10967:

Just realized HDFS-8131 achieves similar goal with a different approach. Will 
close this one after reviewing HDFS-8131 again.

> Add configuration for BlockPlacementPolicy to avoid near-full DataNodes
> -----------------------------------------------------------------------
>                 Key: HDFS-10967
>                 URL: https://issues.apache.org/jira/browse/HDFS-10967
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>            Reporter: Zhe Zhang
>            Assignee: Zhe Zhang
>              Labels: balancer
>         Attachments: HDFS-10967.00.patch, HDFS-10967.01.patch, 
> HDFS-10967.02.patch, HDFS-10967.03.patch
> Large production clusters are likely to have heterogeneous nodes in terms of 
> storage capacity, memory, and CPU cores. It is not always possible to 
> proportionally ingest data into DataNodes based on their remaining storage 
> capacity. Therefore it's possible for a subset of DataNodes to be much closer 
> to full capacity than the rest.
> This heterogeneity is most likely rack-by-rack -- i.e. _m_ whole racks of 
> low-storage nodes and _n_ whole racks of high-storage nodes. So It'd be very 
> useful if we can lower the chance for those near-full DataNodes to become 
> destinations for the 2nd and 3rd replicas.

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