[jira] [Comment Edited] (CASSANDRA-8576) Primary Key Pushdown For Hadoop

["Jeremiah Jordan (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-8576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14536484#comment-14536484 ] 

Jeremiah Jordan edited comment on CASSANDRA-8576 at 5/9/15 12:33 PM:
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bq. It looks better now, but the mixed-cluster during rolling upgrade issue is still there. If someone upgrades half of the cluster to the version with this patch, Hadoop jobs will very likely report errors (not sure how bad that will be - need to test it).

This is only an issue if the jobs are pulling the C* jar off of the nodes and the jar isn't part of the job itself?  So if this is a problem for someone, they have a work around.


was (Author: jjordan):
Bq. It looks better now, but the mixed-cluster during rolling upgrade issue is still there. If someone upgrades half of the cluster to the version with this patch, Hadoop jobs will very likely report errors (not sure how bad that will be - need to test it).

This is only an issue if the jobs are pulling the C* jar off of the nodes and the jar isn't part of the job itself?  So if this is a problem for someone, they have a work around.

> 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, 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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