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From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HDFS-10967) Add configuration for BlockPlacementPolicy to avoid near-full DataNodes
Date Tue, 11 Oct 2016 07:40:21 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10967?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15564741#comment-15564741
] 

Zhe Zhang edited comment on HDFS-10967 at 10/11/16 7:39 AM:
------------------------------------------------------------

Just realized HDFS-8131 and HDFS-8041 address this issue with different approaches.


was (Author: zhz):
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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