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From Demian Berjman <dberj...@despegar.com>
Subject Re: WriteTimeoutException on Lightweight transactions
Date Tue, 24 Dec 2013 14:52:46 GMT
Very helpful!!

Thanks,


On Tue, Dec 24, 2013 at 12:17 AM, Aaron Morton <aaron@thelastpickle.com>wrote:

> Some background….
>
> http://www.datastax.com/dev/blog/lightweight-transactions-in-cassandra-2-0
>
> You can also get a timeout during the prepare phase, well anytime you are
> waiting on other node really. The WriteTimeoutException returned from the
> server includes a writeType (
> https://github.com/apache/cassandra/blob/cassandra-2.0.0-beta1/src/java/org/apache/cassandra/exceptions/WriteTimeoutException.java#L27)
> that will say if it CAS during the prepare and propose phases and simple
> when trying to commit.
>
> it’s also on the WriteTimeoutException in the driver. if it says CAS then
> we did not get to start the write.
>
> Cheers
>
> -----------------
> Aaron Morton
> New Zealand
> @aaronmorton
>
> Co-Founder & Principal Consultant
> Apache Cassandra Consulting
> http://www.thelastpickle.com
>
> On 20/12/2013, at 10:05 am, Demian Berjman <dberjman@despegar.com> wrote:
>
> Hi. I am using Cassandra 2.0.3 with Datastax Java client.
>
> I execute an insert query:
>
> Insert insert =
> QueryBuilder.insertInto("demo_cl","demo_table").value("id",
> id).value("col1", "transactions").ifNotExists();
>
> session.execute(insert.setConsistencyLevel(ConsistencyLevel.QUORUM);
>
> Then, i force a shutdown on one node and get:
>
> com.datastax.driver.core.exceptions.WriteTimeoutException: Cassandra
> timeout during write query at consistency SERIAL (2 replica were required
> but only 1 acknowledged the write)
>
> Then i read the row and i got not results. It seems that it was not
> inserted. What happened to the "1 acknowledged the write"? It's lost? It's
> like a rollback?
>
> Thanks,
>
>
>

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