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https://issues.apache.org/jira/browse/HDFS-8957?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15489137#comment-15489137
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SammiChen commented on HDFS-8957:
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For easy review, I created " HDFS-10861 Refactor StatefulStripeReader and
PositionStripeReader, use ECChunk version decode API ". HDFS-10861 will focus
on refactor and use ECChunk version decode API. And this HDFS-8957 will focus
on consolidate client striping stateful reader and positional reader work.
> 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
> Components: erasure-coding
> Affects Versions: 3.0.0-alpha2
> Reporter: Kai Zheng
> Assignee: SammiChen
> Attachments: HDFS-8957-v1.patch, HDFS-8957.v2.patch,
> HDFS-8957.v3.patch, HDFS-8957.v4.patch
>
>
> 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 pooled ByteBuffers, 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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