Joe Pallas created HDFS-7680:
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Summary: Support dataset-specific choice of short circuit
implementation
Key: HDFS-7680
URL: https://issues.apache.org/jira/browse/HDFS-7680
Project: Hadoop HDFS
Issue Type: Sub-task
Components: datanode, dfsclient, hdfs-client
Affects Versions: 3.0.0
Reporter: Joe Pallas
Assignee: Joe Pallas
As described in HDFS-5194, the current support for short circuit reading is
tightly coupled to the default Dataset implementation. Since alternative
implementations of the FsDatasetSpi may use a different short circuit pathway,
there needs to be a way for the client to acquire the right kind of BlockReader.
Reviewing some considerations:
Today, there is only one dataset per datanode (with multiple volumes). Is that
likely to change?
Can there be multiple datanodes local to a client?
Is it okay to assume that the client and datanode share configuration? More
broadly, how should the client discover the appropriate short-circuit
implementation?
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