incrementally copy files from S3 to local hdfs
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i have an app write data to S3 daily or hourly or just randomly, another app to read data from S3 to local HBase. is there any way to tell what's the last file uploaded from last update, then read files after that, in other word, incrementally copy the files? 

for example:
day 1: App1 write files 1,2,3 to folder 1;App2 read those 3 files to HBase;
day 4: App1 write file 4 & 5 to folder 1, 6,7,8 to folder 2; App2 need to read 4 &5 from folder 1 and then 6,7,8 from folder 2.

thanks
