Steve Loughran created HADOOP-16759:
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Summary: Filesystem openFile() builder to take a FileStatus param
Key: HADOOP-16759
URL: https://issues.apache.org/jira/browse/HADOOP-16759
Project: Hadoop Common
Issue Type: Sub-task
Components: fs, fs/azure, fs/s3
Affects Versions: 3.3.0
Reporter: Steve Loughran
Assignee: Steve Loughran
Let us pass in a file status to openFile() so that S3A & ABFS will skip their
own HEAD requests just to see if a file is there, a normal file and get its
length + etag,
{code}
CompletableFuture<FSDataInputStream> streamF = fs.openFile(stat.getPath())
.withFileStatus(stat).build()
{code}
code opening files off a listing of everything in a directory can eliminate a
lot of requests here.
Also: change the specification of openFile's completable future to say
"returned stream may only raise FNFE, access restrictions on the first read"
That is: it's not just potentially an async open, it's possibly lazy evaluated
entirely.
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