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https://issues.apache.org/jira/browse/HDFS-10967?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zhe Zhang updated HDFS-10967:
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Summary: Add configuration for BlockPlacementPolicy to avoid near-full
DataNodes (was: Add configuration for BlockPlacementPolicy to deprioritize
near-full DataNodes)
> 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
> Labels: balancer
>
> 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.
> Notice that this heterogeneity is most likely rack-by-rack -- i.e. _m_ whole
> racks with low-storage nodes and _n_ whole racks with high-storage nodes. So
> It'd be very useful if we can deprioritize those near-full DataNodes as
> destinations for the 2nd and 3rd replicas.
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