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From "Alex Liu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-8576) Primary Key Pushdown For Hadoop
Date Wed, 29 Apr 2015 19:55:08 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-8576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14520084#comment-14520084
] 

Alex Liu commented on CASSANDRA-8576:
-------------------------------------

Which branch should this go into? Is it still going into 2.1.5 ? or other release?

> Primary Key Pushdown For Hadoop
> -------------------------------
>
>                 Key: CASSANDRA-8576
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8576
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Hadoop
>            Reporter: Russell Alexander Spitzer
>            Assignee: Alex Liu
>             Fix For: 2.1.x
>
>         Attachments: 8576-2.1-branch.txt, 8576-trunk.txt
>
>
> I've heard reports from several users that they would like to have predicate pushdown
functionality for hadoop (Hive in particular) based services. 
> Example usecase
> Table with wide partitions, one per customer
> Application team has HQL they would like to run on a single customer
> Currently time to complete scales with number of customers since Input Format can't pushdown
primary key predicate
> Current implementation requires a full table scan (since it can't recognize that a single
partition was specified)



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