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https://issues.apache.org/jira/browse/HADOOP-12910?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15313473#comment-15313473
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Duo Zhang commented on HADOOP-12910:
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Hey guys, we have posted a proposal on HDFS-916 for implementing NIO based DFS
Output.
https://docs.google.com/document/d/11AyWtGhItQs6vsLRIx32PwTxmBY3libXwGXI25obVEY/edit#heading=h.u1kdzrdn5i99
The API we plan to add is like this
{noformat}
2.1 AsyncFileSystem
CompletableFuture<AsyncFSOutput> create(Path, …) throws IOException;
2.2 AsyncFSOutput
CompletableFuture<Void> write(byte[], int, int) throws IOException;
CompletableFuture<Long> hflush() throws IOException;
CompletableFuture<Long> hsync() throws IOException;
CompletableFuture<Long> close() throws IOException;
{noformat}
The {{CompletableFuture}} can be changed to {{Deferred}}. Callback or listener
is very important for us. And our target is H3, for H2 we could use the current
implementation in HBase(which uses a lot of reflections although...).
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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