kundera Locks

Hello everyone!

Does Kundera supports Jpa locking? ( http://en.wikibooks.org/wiki/Java_Persistence/Locking#JPA_2.0_Locking )

Thanks!

May 27 '13 10:05 bsideup

Nope. Do you any thoughts to share how actually such locking mechanism should work over nosql databases?

-Vivek

May 27 '13 11:05 mevivs

http://wiki.apache.org/cassandra/Locking

Yep.

May 27 '13 11:05 bsideup

It's bit old thread. Does Cassandra support this?

-Vivek

May 27 '13 11:05 mevivs

Hard to say.

But AFAIK Hector support this: https://github.com/hector-client/hector/blob/master/core/src/test/java/me/prettyprint/cassandra/locking/HLockManagerImplTest.java

May 27 '13 11:05 bsideup

AFAIK, Cassandra doesn't.

Such custom implementation at client level may be possible, AFN Kundera doesn't support this.

-Vivek

May 27 '13 12:05 mevivs

Hi

There are no locking in Cassandra, but if you want to implement it please take a look at the Cages library - https://code.google.com/p/cages/ Note, that it requires ZooKeeper

Regards, Oleksandr

May 27 '13 13:05 OleksandrSemenov

Locking in a variable-consistency and multiple-client (each with a possible lock) doesn't seem a sane idea.

May 30 '13 11:05 pires

actually that Cassandra now supports optimistic locking through lightweight-transactions - this could be implemented in Kundera. without such locking - how do you suggest to avoid persisting a stale entity?

May 25 '16 14:05 asafd1

Optimistic locking is one of the many advantages of lightweight transactions. IMHO handling it at higher level (modeling the databases accordingly) would be more appropriate than implementing it in a NoSql datastore mapper like Kundera.

This can be achieved using native querying on Cassandra through Kundera. Please let us know how important it is, your usecase and if we can discuss the best way to achieve it?

We can connect on Gitter

-Karthik

May 26 '16 17:05 karthikprasad13