HADOOP-16202. Enhanced openFile() -branch-3.3 backport #4238
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… via OpenFileParameters (apache#2975)
…1) This defines standard option and values for the openFile() builder API for opening a file: fs.option.openfile.read.policy A list of the desired read policy, in preferred order. standard values are adaptive, default, random, sequential, vector, whole-file fs.option.openfile.length How long the file is. fs.option.openfile.split.start start of a task's split fs.option.openfile.split.end end of a task's split These can be used by filesystem connectors to optimize their reading of the source file, including but not limited to * skipping existence/length probes when opening a file * choosing a policy for prefetching/caching data The hadoop shell commands which read files all declare "whole-file" and "sequential", as appropriate. Contributed by Steve Loughran. Change-Id: Ia290f79ea7973ce8713d4f90f1315b24d7a23da1
…e#2584/2) These changes ensure that sequential files are opened with the right read policy, and split start/end is passed in. As well as offering opportunities for filesystem clients to choose fetch/cache/seek policies, the settings ensure that processing text files on an s3 bucket where the default policy is "random" will still be processed efficiently. This commit depends on the associated hadoop-common patch, which must be committed first. Contributed by Steve Loughran. Change-Id: Ic6713fd752441cf42ebe8739d05c2293a5db9f94
S3A input stream support for the few fs.option.openfile settings. As well as supporting the read policy option and values, if the file length is declared in fs.option.openfile.length then no HEAD request will be issued when opening a file. This can cut a few tens of milliseconds off the operation. The patch adds a new openfile parameter/FS configuration option fs.s3a.input.async.drain.threshold (default: 16000). It declares the number of bytes remaining in the http input stream above which any operation to read and discard the rest of the stream, "draining", is executed asynchronously. This asynchronous draining offers some performance benefit on seek-heavy file IO. Contributed by Steve Loughran. Change-Id: I9b0626bbe635e9fd97ac0f463f5e7167e0111e39
Stops the abfs connector warning if openFile().withFileStatus() is invoked with a FileStatus is not an abfs VersionedFileStatus. Contributed by Steve Loughran. Change-Id: I85076b365eb30aaef2ed35139fa8714efd4d048e
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💔 -1 overall
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merged locally; closing |
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Description of PR
backport of HADOOP-16202. Enhanced openFile() to branch-3.3, plus a couple of other cherrypicks from trunk to ease the backporting.
if yetus is happy i wil merge the entire sequence in as the ordered chain of commits
How was this patch tested?
cloud store testing in progress against aws london and azure cardiff.
For code changes:
LICENSE,LICENSE-binary,NOTICE-binaryfiles?