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From "Hive QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-11954) Extend logic to choose side table in MapJoin Conversion algorithm
Date Fri, 16 Oct 2015 12:46:05 GMT

    [ https://issues.apache.org/jira/browse/HIVE-11954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14960609#comment-14960609
] 

Hive QA commented on HIVE-11954:
--------------------------------



Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12766757/HIVE-11954.10.patch

{color:red}ERROR:{color} -1 due to no test(s) being added or modified.

{color:red}ERROR:{color} -1 due to 2 failed/errored test(s), 9694 tests executed
*Failed tests:*
{noformat}
org.apache.hive.hcatalog.api.TestHCatClient.testTableSchemaPropagation
org.apache.hive.jdbc.TestSSL.testSSLVersion
{noformat}

Test results: http://ec2-174-129-184-35.compute-1.amazonaws.com/jenkins/job/PreCommit-HIVE-TRUNK-Build/5675/testReport
Console output: http://ec2-174-129-184-35.compute-1.amazonaws.com/jenkins/job/PreCommit-HIVE-TRUNK-Build/5675/console
Test logs: http://ec2-174-129-184-35.compute-1.amazonaws.com/logs/PreCommit-HIVE-TRUNK-Build-5675/

Messages:
{noformat}
Executing org.apache.hive.ptest.execution.TestCheckPhase
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: 2 tests failed
{noformat}

This message is automatically generated.

ATTACHMENT ID: 12766757 - PreCommit-HIVE-TRUNK-Build

> Extend logic to choose side table in MapJoin Conversion algorithm
> -----------------------------------------------------------------
>
>                 Key: HIVE-11954
>                 URL: https://issues.apache.org/jira/browse/HIVE-11954
>             Project: Hive
>          Issue Type: Bug
>          Components: Physical Optimizer
>    Affects Versions: 2.0.0
>            Reporter: Jesus Camacho Rodriguez
>            Assignee: Jesus Camacho Rodriguez
>         Attachments: HIVE-11954.01.patch, HIVE-11954.02.patch, HIVE-11954.03.patch, HIVE-11954.04.patch,
HIVE-11954.05.patch, HIVE-11954.06.patch, HIVE-11954.07.patch, HIVE-11954.08.patch, HIVE-11954.09.patch,
HIVE-11954.10.patch, HIVE-11954.patch, HIVE-11954.patch
>
>
> Selection of side table (in memory/hash table) in MapJoin Conversion algorithm needs
to be more sophisticated.
> In an N way Map Join, Hive should pick an input stream as side table (in memory table)
that has least cost in producing relation (like TS(FIL|Proj)*).
> Cost based choice needs extended cost model; without return path its going to be hard
to do this.
> For the time being we could employ a modified cost based algorithm for side table selection.
> New algorithm is described below:
> 1. Identify the candidate set of inputs for side table (in memory/hash table) from the
inputs (based on conditional task size)
> 2. For each of the input identify its cost, memory requirement. Cost is 1 for each heavy
weight relation op (Join, GB, PTF/Windowing, TF, etc.). Cost for an input is the total no
of heavy weight ops in its branch.
> 3. Order set from #1 on cost & memory req (ascending order)
> 4. Pick the first element from #3 as the side table.



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