[jira] [Created] (HDFS-6383) Upgrade S3n s3.fs.buffer.dir to suppoer multi directories

["Ted Malaska (JIRA)" <ji...@apache.org>]

Ted Malaska created HDFS-6383:
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             Summary: Upgrade S3n s3.fs.buffer.dir to suppoer multi directories
                 Key: HDFS-6383
                 URL: https://issues.apache.org/jira/browse/HDFS-6383
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: Ted Malaska
            Priority: Minor


s3.fs.buffer.dir defines the tmp folder where files will be written to before getting sent to S3.  Right now this is limited to a single folder which causes to major issues.

1. You need a drive with enough space to store all the tmp files at once
2. You are limited to the IO speeds of a single drive

This solution will resolve both and has been tested to increase the S3 write speed by 2.5x with 10 mappers on hs1.





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