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https://issues.apache.org/jira/browse/HDFS-3051?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13223096#comment-13223096
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dhruba borthakur commented on HDFS-3051:
----------------------------------------
The new API can be a new method in FSDataInputStream.
{code}
public List<ByteBuffer> readFullyScatterGather(long position, int length)
throws IOException {
return ((PositionedReadable)in).readFullyScatterGather(position, length);
}
{code}
This will allow an application to read multiple sections of the file at the
same time. It will also allow HDFS to return mapped byte buffers or direct byte
buffers.
> A zero-copy read api from FSDataInputStream
> -------------------------------------------
>
> Key: HDFS-3051
> URL: https://issues.apache.org/jira/browse/HDFS-3051
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs client
> Reporter: dhruba borthakur
>
> It will be nice if we can get a new API from FSDtaInputStream that allows for
> zero-copy read for hdfs readers.
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