Re: A (drop-in) replacement for ColumnFamilyRecordReader in C*3?

[Jeff Jirsa]

Changing your code to wrap org.apache.cassandra.hadoop.cql3.CqlRecordReader is 
probably easier than trying to bring the old thrift based record reader into 
the 3.0 world, but I don't have any concrete code examples.

-- 
Jeff Jirsa


> On May 2, 2017, at 6:02 PM, kedar mhaswade  wrote:
> 
> Hello Cassandra Devs,
> 
> See https://issues.apache.org/jira/browse/CASSANDRA-10996. This JIRA tells us 
> the schema changes between C*2 and C*3. Sylvain Lebresne suggests that one 
> should use the KeyspaceMetadata and related classes from the DataStax driver 
> instead of running queries against the internal schema keyspaces which have 
> also moved. 
> 
> My problem is related to CASSANDRA-10996, although unlike the reporter of 
> that report, I am not doing a query like that. It's a Cassandra 2.2 class 
> itself that does a similar query for me. This class is 
> org.apache.cassandra.hadoop.ColumnFamilyRecordReader which is used as-is (via 
> a wrapper) in one of the projects I am working on (JanusGraph). Since this 
> class is not found on Cassandra trunk, there must be something that replaces 
> its functionality (hopefully a drop-in replacement). And the way it fails 
> JanusGraph is documented in this bug: 
> https://github.com/JanusGraph/janusgraph/issues/172.
> 
> I have two questions in this regard:
> 1- Is there a replacement for CFRR?
> 2- If not, can someone provide a way to replace ColumnFamilyRecordReader 
> functionality, hopefully with some example code? I am thinking that we could 
> wrap org.apache.cassandra.hadoop.cql3.CqlRecordReader instead of CFRR, but I 
> need a bit more context before I embark on that adventure.
> 
> Thanks and Best Regards,
> Kedar
> 
> 
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A (drop-in) replacement for ColumnFamilyRecordReader in C*3?

[kedar mhaswade]

Hello Cassandra Devs,

See https://issues.apache.org/jira/browse/CASSANDRA-10996. This JIRA tells us 
the schema changes between C*2 and C*3. Sylvain Lebresne suggests that one 
should use the KeyspaceMetadata and related classes from the DataStax driver 
instead of running queries against the internal schema keyspaces which have 
also moved. 

My problem is related to CASSANDRA-10996, although unlike the reporter of that 
report, I am not doing a query like that. It's a Cassandra 2.2 class itself 
that does a similar query for me. This class is 
org.apache.cassandra.hadoop.ColumnFamilyRecordReader which is used as-is (via a 
wrapper) in one of the projects I am working on (JanusGraph). Since this class 
is not found on Cassandra trunk, there must be something that replaces its 
functionality (hopefully a drop-in replacement). And the way it fails 
JanusGraph is documented in this bug: 
https://github.com/JanusGraph/janusgraph/issues/172.

I have two questions in this regard:
1- Is there a replacement for CFRR?
2- If not, can someone provide a way to replace ColumnFamilyRecordReader 
functionality, hopefully with some example code? I am thinking that we could 
wrap org.apache.cassandra.hadoop.cql3.CqlRecordReader instead of CFRR, but I 
need a bit more context before I embark on that adventure.

Thanks and Best Regards,
Kedar


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