[jira] [Commented] (DRILL-92) Cassandra storage engine

["Yash Sharma (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DRILL-92?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14385660#comment-14385660 ] 

Yash Sharma commented on DRILL-92:
----------------------------------

[~snazy] + All : On the points mentioned in the review comment - 
- Multiple Initial contact points: The patch now handles multiple initial contact points and passes all the information while connecting to the cluster. Tested with bringing down certain nodes.
- Session handling : Now the patch uses the cluster instance rather than session.
- Endpoint affinity & Partition token: The code does consider endpoint affinity such that - if one of drill endpoint is also a cassandra node it would have an affinity. The partition token is however for a different purpose. The partition scheme just ensures that different sub-scans of drill do not fetch the same range of keys again. It works as a range restriction for each sub-scan. We are not using it to check where the actual partition data lies.
Tables & Keyspace cache: This is cached not for the functionality for querying cassandra. Its a schema information which we would need when the user would like to describe a table or check tables in keyspace etc. We just cache it. 

Thanks for the review comments.  Please share your thoughts on the new patch.

> Cassandra storage engine
> ------------------------
>
>                 Key: DRILL-92
>                 URL: https://issues.apache.org/jira/browse/DRILL-92
>             Project: Apache Drill
>          Issue Type: New Feature
>            Reporter: Steven Phillips
>            Assignee: Yash Sharma
>             Fix For: Future
>
>         Attachments: DRILL-92-Cassandra-Storage.patch, DRILL-92.patch, DRILL-CASSANDRA.patch
>
>




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