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From "Jonathan Ellis (JIRA)" <>
Subject [jira] [Updated] (CASSANDRA-8576) Primary Key Pushdown For Hadoop
Date Mon, 29 Jun 2015 16:02:05 GMT


Jonathan Ellis updated CASSANDRA-8576:
    Fix Version/s:     (was: 2.1.x)

Let's keep 2.1 for bug fixes and commit this to 2.2.  Can I get a 2.2 patch from Alex?

> Primary Key Pushdown For Hadoop
> -------------------------------
>                 Key: CASSANDRA-8576
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Hadoop
>            Reporter: Russell Alexander Spitzer
>            Assignee: Alex Liu
>             Fix For: 2.2.x
>         Attachments: 8576-2.1-branch.txt, 8576-trunk.txt, CASSANDRA-8576-v2-2.1-branch.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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