HADOOP-18347. S3A Vectored IO to use bounded thread pool. (#4918)


part of HADOOP-18103.

Also introducing a config fs.s3a.vectored.active.ranged.reads
to configure the maximum number of number of range reads a
single input stream can have active (downloading, or queued)
to the central FileSystem instance's pool of queued operations.
This stops a single stream overloading the shared thread pool.

Contributed by: Mukund Thakur
5 files changed