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Posted to hdfs-issues@hadoop.apache.org by "Chris Douglas (JIRA)" <ji...@apache.org> on 2016/02/13 02:39:18 UTC

[jira] [Created] (HDFS-9807) Add an optional StorageID to writes

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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