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https://issues.apache.org/jira/browse/HDFS-14478?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Loughran resolved HDFS-14478.
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Fix Version/s: 3.3.4
Resolution: Fixed
> Add libhdfs APIs for openFile
> -----------------------------
>
> Key: HDFS-14478
> URL: https://issues.apache.org/jira/browse/HDFS-14478
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs-client, libhdfs, native
> Reporter: Sahil Takiar
> Assignee: Steve Loughran
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.3.4
>
> Time Spent: 2h 20m
> Remaining Estimate: 0h
>
> HADOOP-15229 added a "FileSystem builder-based openFile() API" that allows
> specifying configuration values for opening files (similar to HADOOP-14365).
> Support for {{openFile}} will be a little tricky as it is asynchronous and
> {{FutureDataInputStreamBuilder#build}} returns a {{CompletableFuture}}.
> At a high level, the API for {{openFile}} could look something like this:
> {code:java}
> hdfsFile hdfsOpenFile(hdfsFS fs, const char* path, int flags,
> int bufferSize, short replication, tSize blocksize);
> hdfsOpenFileBuilder *hdfsOpenFileBuilderAlloc(hdfsFS fs,
> const char *path);
> hdfsOpenFileBuilder *hdfsOpenFileBuilderMust(hdfsOpenFileBuilder *builder,
> const char *key, const char *value);
> hdfsOpenFileBuilder *hdfsOpenFileBuilderOpt(hdfsOpenFileBuilder *builder,
> const char *key, const char *value);
> hdfsOpenFileFuture *hdfsOpenFileBuilderBuild(hdfsOpenFileBuilder *builder);
> void hdfsOpenFileBuilderFree(hdfsOpenFileBuilder *builder);
> hdfsFile hdfsOpenFileFutureGet(hdfsOpenFileFuture *future);
> hdfsFile hdfsOpenFileFutureGetWithTimeout(hdfsOpenFileFuture *future,
> int64_t timeout, javaConcurrentTimeUnit timeUnit);
> int hdfsOpenFileFutureCancel(hdfsOpenFileFuture *future,
> int mayInterruptIfRunning);
> void hdfsOpenFileFutureFree(hdfsOpenFileFuture *future);
> {code}
> Instead of exposing all the functionality of {{CompleteableFuture}} libhdfs
> would just expose the functionality of {{Future}}.
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