Attempted to convert rather large mongo dump to dynamo.
Seems like AWS data pipeline is most elegant way to do this if one can workaround with dynamo non-standard json format issue.
Get https://www.npmjs.com/package/dyngodb2 and create a collection
export json and run some sed to trim
mongoexport --db=wiki --collection=wiki -f title,text > output.json
sed -i 's/{ \"$oid\" : \"/"/g;s/\" }, \"/", "/g;s/{{{//g;s/}}}//g;s/{{//g;s/}}//g;s/$/,/g;' output.json
split file to avoid OOM, adjust 30000 based on your free ram then add [ and replace trailing, with ]
split -l 30000 output.json sed -i '1s/^/[/;$s/,$/]/' x*
import & make a batch process to do all sliced files
dyngodb2 < db.wiki.save(json('xaa'))
{
"operation": "echo",
"TableName": "Thread",
"Key": {
"title-index": "!"
}
}