How to get, examine and update/insert few records in one transaction

Client Libraries Python Client
1

Hi, I would like to insert new record, but the value of the record can be dependant on other records. The ideal way would be:

  • start transaction
  • get all connected records if they exist
  • based on them set the value of the new record
  • insert or update the record
  • stop the transaction I would like to avoid modification of dependant records between read and write by the concurrent script.

Is it possible in aerospike? If so, please give me some tips. As I understand UDFs can only work on one record, and it is not possible to make additional gets inside UDF function.

Thanks!

Ela

2

Are you using Community Edition (CE) or Enterprise Edition (EE)? Reason I ask this … natively you cannot do this in Aerospike. But there could be a way to do this from the application level. However, with any multi-record transaction to be fool proof, you must worry about cluster splitting midway through your transaction. In Aerospike 4.0 EE, you can operate a namespace in Strong Consistency (SC) mode. Without SC mode, one cannot talk about multi-record transactions. So, I don’t see how this can be done on CE which does not offer SC Mode. So, are you looking for an EE solution or a CE solution?

3

Thank you for your reply. I’m using CE edition. I will try to implement CAS solution than. Probably it won’t be 100% good for all possible cases, but I hope it will be good enough.

Thank you!

4

CAS works on the same record - to read in first call into the client, modify in client based on what you read, and write back to the same record.