bhalchandrap opened a new pull request #3736:
URL: https://github.com/apache/hadoop/pull/3736
### Description of PR
I work for Pinterest. I developed a technique for vastly improving read
throughput when reading from the S3 file system. It not only helps the
sequential read case (like reading a SequenceFile) but also significantly
improves read throughput of a random access case (like reading Parquet). This
technique has been very useful in significantly improving efficiency of the
data processing jobs at Pinterest.
I would like to contribute that feature to Apache Hadoop. More details on
this technique are available in this blog I wrote recently:
https://medium.com/pinterest-engineering/improving-efficiency-and-reducing-runtime-using-s3-read-optimization-b31da4b60fa0
### How was this patch tested?
Tested against S3 in us-east-1 region.
There are a small number of test failures (most within s3guard). I can
attach test output if it helps.
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