Kai Zheng created HDFS-8957:
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Summary: Consolidate client striping input stream codes for
stateful read and positional read
Key: HDFS-8957
URL: https://issues.apache.org/jira/browse/HDFS-8957
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: Kai Zheng
Assignee: Kai Zheng
Fix For: HDFS-7285
Currently we have different implementations for client striping read, having
both *StatefulStripeReader* and *PositionStripeReader*. I attempted to
consolidate the two implementations into one, and it results in much simpler
codes, and also better performance. Now in both read paths, it will:
* Use ByteBuffer instead of bytes array, as currently stateful read does;
* Read directly into application's buffer, as currently positional read does;
* Try to align and merge multiple stripes, as currently positional read does;
* Use *ECChunk* version decode API.
The resultant *StripeReader* is approaching very near now to the ideal state
desired by next step, employing *ErasureCoder* API instead of *RawErasureCoder*
API.
Will upload an initial patch to illustrate the rough change, even though it
depends on other issues.
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