Cassandra store issues

[Valentin Kulichenko]

Hi Igor,

There are two recent questions on the user forum regarding ignite-cassandra
module, and they seem to be very similar to each other:

   -
   http://apache-ignite-users.70518.x6.nabble.com/Timestamp-is-not-stored-correctly-with-Cassandra-td11590.html
   -
   http://apache-ignite-users.70518.x6.nabble.com/Mapping-java-util-Map-in-CassandraPersistentStore-td11574.html

Can you please take a look?

Do we support all Cassandra data types properly? If not, why?

-Val

[irudyak]

Hi Val,

Thanks for the info. I replied to both questions.

Regarding the first question - we just don't support mapping from
java.sql.Timestamp to Cassandra's Datatype.Name.TIMESTAMP type, cause there
are no direct mapping for it
http://docs.datastax.com/en/developer/java-driver/3.1/manual/#cql-to-java-type-mapping.
We can easily add support for this mapping, but there actually plenty of
other Timestamp types in core java (java.sql.Timestamp,
java.security.Timestamp, java.sun.jmx.snmp.Timestamp and etc.) and even
more in different third party libraries. Thus it's just technically not
possible to add support for all variety of Timestamps.

Regarding second question - in current implementation, complex data types
(collections, custom types) could only be mapped to BLOB type in Cassandra.

Igor

On Thu, Mar 30, 2017 at 5:39 PM, Valentin Kulichenko <
[hidden email]> wrote:

> Hi Igor,
>
> There are two recent questions on the user forum regarding
> ignite-cassandra module, and they seem to be very similar to each other:
>
>    - http://apache-ignite-users.70518.x6.nabble.com/Timestamp-
>    is-not-stored-correctly-with-Cassandra-td11590.html
>    <http://apache-ignite-users.70518.x6.nabble.com/Timestamp-is-not-stored-correctly-with-Cassandra-td11590.html>
>    - http://apache-ignite-users.70518.x6.nabble.com/Mapping-
>    java-util-Map-in-CassandraPersistentStore-td11574.html
>    <http://apache-ignite-users.70518.x6.nabble.com/Mapping-java-util-Map-in-CassandraPersistentStore-td11574.html>
>
> Can you please take a look?
>
> Do we support all Cassandra data types properly? If not, why?
>
> -Val
>

[Valentin Kulichenko]

Igor,

Thanks for clarifications!

-Val

On Thu, Mar 30, 2017 at 9:09 PM, Igor Rudyak <[hidden email]> wrote:

> Hi Val,
>
> Thanks for the info. I replied to both questions.
>
> Regarding the first question - we just don't support mapping from
> java.sql.Timestamp to Cassandra's Datatype.Name.TIMESTAMP type, cause there
> are no direct mapping for it http://docs.datastax.com/en/
> developer/java-driver/3.1/manual/#cql-to-java-type-mapping.  We can
> easily add support for this mapping, but there actually plenty of other
> Timestamp types in core java (java.sql.Timestamp, java.security.Timestamp,
> java.sun.jmx.snmp.Timestamp and etc.) and even more in different third
> party libraries. Thus it's just technically not possible to add support for
> all variety of Timestamps.
>
> Regarding second question - in current implementation, complex data types
> (collections, custom types) could only be mapped to BLOB type in Cassandra.
>
> Igor
>
> On Thu, Mar 30, 2017 at 5:39 PM, Valentin Kulichenko <
> [hidden email]> wrote:
>
>> Hi Igor,
>>
>> There are two recent questions on the user forum regarding
>> ignite-cassandra module, and they seem to be very similar to each other:
>>
>>    - http://apache-ignite-users.70518.x6.nabble.com/Timestamp-is-
>>    not-stored-correctly-with-Cassandra-td11590.html
>>    <http://apache-ignite-users.70518.x6.nabble.com/Timestamp-is-not-stored-correctly-with-Cassandra-td11590.html>
>>    - http://apache-ignite-users.70518.x6.nabble.com/Mapping-java-
>>    util-Map-in-CassandraPersistentStore-td11574.html
>>    <http://apache-ignite-users.70518.x6.nabble.com/Mapping-java-util-Map-in-CassandraPersistentStore-td11574.html>
>>
>> Can you please take a look?
>>
>> Do we support all Cassandra data types properly? If not, why?
>>
>> -Val
>>
>
>