e199da3fae
Speed up the magic committer with key changes being * Writes under __magic always retain directory markers * File creation under __magic skips all overwrite checks, including the LIST call intended to stop files being created over dirs. * mkdirs under __magic probes the path for existence but does not look any further. Extra parallelism in task and job commit directory scanning Use of createFile and openFile with parameters which all for HEAD checks to be skipped. The committer can write the summary _SUCCESS file to the path `fs.s3a.committer.summary.report.directory`, which can be in a different file system/bucket if desired, using the job id as the filename. Also: HADOOP-15460. S3A FS to add `fs.s3a.create.performance` Application code can set the createFile() option fs.s3a.create.performance to true to disable the same safety checks when writing under magic directories. Use with care. The createFile option prefix `fs.s3a.create.header.` can be used to add custom headers to S3 objects when created. Contributed by Steve Loughran. |
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| .. | ||
| hadoop-mapreduce-client-app | ||
| hadoop-mapreduce-client-common | ||
| hadoop-mapreduce-client-core | ||
| hadoop-mapreduce-client-hs | ||
| hadoop-mapreduce-client-hs-plugins | ||
| hadoop-mapreduce-client-jobclient | ||
| hadoop-mapreduce-client-nativetask | ||
| hadoop-mapreduce-client-shuffle | ||
| hadoop-mapreduce-client-uploader | ||
| pom.xml | ||