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https://issues.apache.org/jira/browse/HADOOP-12910?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15263650#comment-15263650
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Duo Zhang commented on HADOOP-12910:
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And some background here.
In HBASE-14790, we have implemented a {{FanOutOneBlockAsyncDFSOutput}} which
performs much better than the {{DFSOutputStream}} for the WAL in HBase. We want
to push the code back into HDFS.
And also, I have done some work on the HTTP/2 DTP, in HDFS-7966. The HTTP/2 DTP
also needs the asynchronous API to expose its power(as tested in HDFS-7966, it
can not perform better than the original implementation under a blocking
scenario).
This is the reason why I'm interested in this topic.
Thanks.
> Add new FileSystem API to support asynchronous method calls
> -----------------------------------------------------------
>
> Key: HADOOP-12910
> URL: https://issues.apache.org/jira/browse/HADOOP-12910
> Project: Hadoop Common
> Issue Type: New Feature
> Components: fs
> Reporter: Tsz Wo Nicholas Sze
> Assignee: Xiaobing Zhou
> Attachments: HADOOP-12910-HDFS-9924.000.patch,
> HADOOP-12910-HDFS-9924.001.patch, HADOOP-12910-HDFS-9924.002.patch
>
>
> Add a new API, namely FutureFileSystem (or AsynchronousFileSystem, if it is a
> better name). All the APIs in FutureFileSystem are the same as FileSystem
> except that the return type is wrapped by Future, e.g.
> {code}
> //FileSystem
> public boolean rename(Path src, Path dst) throws IOException;
> //FutureFileSystem
> public Future<Boolean> rename(Path src, Path dst) throws IOException;
> {code}
> Note that FutureFileSystem does not extend FileSystem.
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