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https://issues.apache.org/jira/browse/HADOOP-16202?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17556210#comment-17556210
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Ayush Saxena commented on HADOOP-16202:
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#2584 seems to break TestLocalDistributedCacheManager
https://ci-hadoop.apache.org/job/hadoop-qbt-trunk-java8-linux-x86_64/895/testReport/junit/org.apache.hadoop.mapred/TestLocalDistributedCacheManager/testDownload/
NPE:
{noformat}
Caused by: java.lang.NullPointerException
at org.apache.hadoop.yarn.util.FSDownload.unpack(FSDownload.java:340)
at
org.apache.hadoop.yarn.util.FSDownload.downloadAndUnpack(FSDownload.java:314)
... 13 more
{noformat}
Tried reverting #2584 and the test passed post that, can you give a check once,
if it is related
> Enhance openFile() for better read performance against object stores
> ---------------------------------------------------------------------
>
> Key: HADOOP-16202
> URL: https://issues.apache.org/jira/browse/HADOOP-16202
> Project: Hadoop Common
> Issue Type: Improvement
> Components: fs, fs/s3, tools/distcp
> Affects Versions: 3.3.0
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.4.0, 3.3.4
>
> Time Spent: 23h 10m
> Remaining Estimate: 0h
>
> The {{openFile()}} builder API lets us add new options when reading a file
> Add an option {{"fs.s3a.open.option.length"}} which takes a long and allows
> the length of the file to be declared. If set, *no check for the existence of
> the file is issued when opening the file*
> Also: withFileStatus() to take any FileStatus implementation, rather than
> only S3AFileStatus -and not check that the path matches the path being
> opened. Needed to support viewFS-style wrapping and mounting.
> and Adopt where appropriate to stop clusters with S3A reads switched to
> random IO from killing download/localization
> * fs shell copyToLocal
> * distcp
> * IOUtils.copy
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