Chris Douglas created HDFS-9807:
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Summary: Add an optional StorageID to writes
Key: HDFS-9807
URL: https://issues.apache.org/jira/browse/HDFS-9807
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Chris Douglas
The {{BlockPlacementPolicy}} considers specific storages, but when the replica
is written the DN {{VolumeChoosingPolicy}} is unaware of any preference or
constraints from other policies affecting placement. This limits heterogeneity
to the declared storage types, which are treated as fungible within the target
DN. It should be possible to influence or constrain the DN policy to select a
particular storage.
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