So, it means that having different tables will not result into same partition even though you have same partition key. Ex. TableA( Partionkey(id)) TableB( Partionkey(id)) TableC( Partionkey(id))
and as part of batch operation I am somehow providing same id say "20" It wont be considered as Atomic as it will result into different partition key and there would not be any way to rollback ? The same is being claimed in https://stackoverflow.com/questions/36700859/does-the-same-partition-key-in-different-cassandra-tables-add-up-to-cell-theoret Please confirm Thanks in advance. Regards, Rajesh On Thu, Apr 19, 2018 at 3:10 PM, Jacques-Henri Berthemet < jacques-henri.berthe...@genesys.com> wrote: > When using BATCH on multiple tables you’ll need to use a LOGGED batch. > When you send the request, it will be written to the batch log of all > (relevant) nodes, when this write is successful it will be “accepted” and > nodes will try to apply the batch operations. If for any reason a statement > fails the node will keep retrying forever. In that case you may see > partially applied batch until it’s fixed. > > > > Note that you can’t mix BATCH and LWT on different tables/partitions. > > > > You can get more details here: > > http://cassandra.apache.org/doc/latest/cql/dml.html#batch > > https://inoio.de/blog/2016/01/13/cassandra-to-batch-or-not-to-batch/ > > *--* > > *Jacques-Henri Berthemet* > > > > *From:* Rajesh Kishore [mailto:rajesh10si...@gmail.com] > *Sent:* Thursday, April 19, 2018 11:13 AM > *To:* user@cassandra.apache.org > > *Subject:* Re: Does Cassandra supports ACID txn > > > > Thanks for the response. Let me put my question again wrt a example > > I want to perform a atomic txn say insert/delete/update on a set of tables > > TableA > > TableB > > TableC > > When these are performed as batch operations and let us say something goes > wrong while doing operation at TableC > > Would the system rollback the operations done for TableA TableB ? > > -Rajesh > > > > > > On Thu, Apr 19, 2018 at 1:25 PM, Jacques-Henri Berthemet < > jacques-henri.berthe...@genesys.com> wrote: > > Cassandra support LWT (Lightweight transactions), you may find this doc > interesting: > > https://docs.datastax.com/en/cassandra/3.0/cassandra/dml/ > dmlDataConsistencyTOC.html > > > > In any case, LWT or BATCH you won’t have external control on the tx, it’s > either done or not done. In case of timeout you won’t have a way to know > if it worked or not. > > There is no way to rollback a statement/batch, the only way is to send an > update to modify the partition to its previous state. > > > > Regards, > > *--* > > *Jacques-Henri Berthemet* > > > > *From:* DuyHai Doan [mailto:doanduy...@gmail.com] > *Sent:* Thursday, April 19, 2018 9:10 AM > *To:* user <user@cassandra.apache.org> > *Subject:* Re: Does Cassandra supports ACID txn > > > > No ACID transaction any soon in Cassandra > > > > On Thu, Apr 19, 2018 at 7:35 AM, Rajesh Kishore <rajesh10si...@gmail.com> > wrote: > > Hi, > > I am bit confused by reading different articles, does recent version of > Cassandra supports ACID transaction ? > > I found BATCH command , but not sure if it supports rollback, consider > that transaction I am going to perform would be on single partition. > > Also, what are the limitations if any? > > > > Thanks, > > Rajesh > > > > >
