Restart mechanism in Spring batch

Assume that I have an of 10000 requests/items, I have configured skip limit as 100 ,
Now batch started reading/processing
in the middle the items are skipped continously becoz of a third party server instance down for some n hours.
after 100 th skip , the job fails .

which this scenario I have foloowing open questions

1) How to restart the job after the server instance is UP , do we need to have any unique id , if then where to configure it ?
2) If I restart the job manually , will it process all items again from beginning or will it start from the last skipped position ?
3) if restart starts from last skipped position (i.e 100 th skipped item), how shall i restart fromthe 1 st skipped item
because those have to be processed again .
Here which is reffered as "left Off position " - 1st skipped item or 100 th skipped item ??/

Please reply in detail .

Thanks
Javadev333

Metadata in the database is used during a job restart to attempt to pick up where it left off.

Are you doing chunk processing?

Jeff

This is nice.
this is right because i have try it.