first cut at parallel s3 writer
first cut at parallel s3 writer

j-friedrich/thunder,poolio/thunder,oliverhuangchao/thunder,thunder-project/thunder,broxtronix/thunder,kunallillaney/thunder,pearsonlab/thunder,zhwa/thunder,kcompher/thunder,kcompher/thunder,mikarubi/thunder,mikarubi/thunder,jwittenbach/thunder,j-friedrich/thunder,poolio/thunder,zhwa/thunder,broxtronix/thunder,pearsonlab/thunder,kunallillaney/thunder,oliverhuangchao/thunder