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From "Hive QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-7805) Support running multiple scans in hbase-handler
Date Sat, 23 Aug 2014 05:00:12 GMT

    [ https://issues.apache.org/jira/browse/HIVE-7805?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14107862#comment-14107862
] 

Hive QA commented on HIVE-7805:
-------------------------------



{color:red}Overall{color}: -1 at least one tests failed

Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12663731/HIVE-7805.1.patch

{color:red}ERROR:{color} -1 due to 1 failed/errored test(s), 6123 tests executed
*Failed tests:*
{noformat}
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_dynpart_sort_opt_vectorization
{noformat}

Test results: http://ec2-174-129-184-35.compute-1.amazonaws.com/jenkins/job/PreCommit-HIVE-TRUNK-Build/471/testReport
Console output: http://ec2-174-129-184-35.compute-1.amazonaws.com/jenkins/job/PreCommit-HIVE-TRUNK-Build/471/console
Test logs: http://ec2-174-129-184-35.compute-1.amazonaws.com/logs/PreCommit-HIVE-TRUNK-Build-471/

Messages:
{noformat}
Executing org.apache.hive.ptest.execution.PrepPhase
Executing org.apache.hive.ptest.execution.ExecutionPhase
Executing org.apache.hive.ptest.execution.ReportingPhase
Tests exited with: TestsFailedException: 1 tests failed
{noformat}

This message is automatically generated.

ATTACHMENT ID: 12663731

> Support running multiple scans in hbase-handler
> -----------------------------------------------
>
>                 Key: HIVE-7805
>                 URL: https://issues.apache.org/jira/browse/HIVE-7805
>             Project: Hive
>          Issue Type: Improvement
>          Components: HBase Handler
>    Affects Versions: 0.14.0
>            Reporter: Andrew Mains
>            Assignee: Andrew Mains
>            Priority: Minor
>         Attachments: HIVE-7805.1.patch, HIVE-7805.patch
>
>
> Currently, the HiveHBaseTableInputFormat only supports running a single scan. This can
be less efficient than running multiple disjoint scans in certain cases, particularly when
using a composite row key. For instance, given a row key schema of:
> {code}
> struct<bucket int, time timestamp>
> {code}
> if one wants to push down the predicate:
> {code}
> bucket IN (1, 10, 100) AND timestamp >= 1408333927 AND timestamp < 1408506670
> {code}
> it's much more efficient to run a scan for each bucket over the time range (particularly
if there's a large amount of data per day). With a single scan, the MR job has to process
the data for all time for buckets in between 1 and 100.
> hive should allow HBaseKeyFactory's to decompose a predicate into one or more scans in
order to take advantage of this fact.



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