Ewan Higgs created HDFS-12589:
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Summary: [DISCUSS] Provided Storage BlockAlias Refactoring
Key: HDFS-12589
URL: https://issues.apache.org/jira/browse/HDFS-12589
Project: Hadoop HDFS
Issue Type: Sub-task
Components: hdfs
Reporter: Ewan Higgs
Priority: Minor
A BlockAlias is an interface used by the Datanode to determine where to
retrieve data from. It currently has a single implementation: {{FileRegion}}
which contains the Block, BlockPoolID, Provided URL for the FileRegion (i.e.
block); and length and offset of the FileRegion in the remote storage.
The BlockAlias currently has a single method: {{getBlock}}. This is not
particularly useful since we can't ask it meaningful questions like 'how do we
retrieve the data from the external storage system?'. Or 'is the version of the
block in the external storage system up to data?'. Either we can do away with
the BlockAlias altogether and work with FileRegion, or the BlockAlias needs to
be made more robust.
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