Chris Douglas created HDFS-9807: ----------------------------------- 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332)