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From DuyHai Doan <doanduy...@gmail.com>
Subject Re: Released an ACID-compliant transaction library on top of Cassandra
Date Tue, 16 Oct 2018 16:50:52 GMT
I think it does use LWT under the hood:

https://github.com/scalar-labs/scalardb/blob/master/src/main/java/com/scalar/database/transaction/consensuscommit/CommitMutationComposer.java#L74-L79

return new Put(base.getPartitionKey(), getClusteringKey(base,
result).orElse(null))
        .forNamespace(base.forNamespace().get())
        .forTable(base.forTable().get())
        .withConsistency(Consistency.LINEARIZABLE)
        .withCondition(
            new PutIf(
                new ConditionalExpression(ID, toIdValue(id), Operator.EQ),
                new ConditionalExpression(
                    STATE, toStateValue(TransactionState.PREPARED),
Operator.EQ)))
        .withValue(Attribute.toCommittedAtValue(current))
        .withValue(Attribute.toStateValue(TransactionState.COMMITTED));



On Tue, Oct 16, 2018 at 6:40 PM sankalp kohli <kohlisankalp@gmail.com>
wrote:

> What License did you use? Can we please use Apache 2.0?
>
> On Tue, Oct 16, 2018 at 9:39 AM sankalp kohli <kohlisankalp@gmail.com>
> wrote:
>
>> This is awesome and thanks for working on it.
>>
>> On Tue, Oct 16, 2018 at 9:37 AM Ariel Weisberg <ariel@weisberg.ws> wrote:
>>
>>> Hi,
>>>
>>> Yes this does sound great. Does this rely on Cassandra's internal SERIAL
>>> consistency and CAS functionality or is that implemented at a higher level?
>>>
>>> Regards,
>>> Ariel
>>>
>>> On Tue, Oct 16, 2018, at 12:31 PM, Jeff Jirsa wrote:
>>> > This is great!
>>> >
>>> > --
>>> > Jeff Jirsa
>>> >
>>> >
>>> > > On Oct 16, 2018, at 5:47 PM, Hiroyuki Yamada <mogwaing@gmail.com>
>>> wrote:
>>> > >
>>> > > Hi all,
>>> > >
>>> > > # Sorry, I accidentally emailed the following to dev@, so
>>> re-sending to here.
>>> > >
>>> > > We have been working on ACID-compliant transaction library on top of
>>> > > Cassandra called Scalar DB,
>>> > > and are pleased to announce the release of v.1.0 RC version in open
>>> source.
>>> > >
>>> > > https://github.com/scalar-labs/scalardb/
>>> > >
>>> > > Scalar DB is a library that provides a distributed storage
>>> abstraction
>>> > > and client-coordinated distributed transaction on the storage,
>>> > > and makes non-ACID distributed database/storage ACID-compliant.
>>> > > And Cassandra is the first supported database implementation.
>>> > >
>>> > > It's been internally tested intensively and is jepsen-passed.
>>> > > (see jepsen directory for more detail)
>>> > > If you are looking for ACID transaction capability on top of
>>> cassandra,
>>> > > Please take a look and give us a feedback or contribution.
>>> > >
>>> > > Best regards,
>>> > > Hiroyuki Yamada
>>> > >
>>> > > ---------------------------------------------------------------------
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>>> > > For additional commands, e-mail: user-help@cassandra.apache.org
>>> > >
>>> >
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>>> >
>>>
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>>>

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