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From "Hive QA (JIRA)" <>
Subject [jira] [Commented] (HIVE-9277) Hybrid Hybrid Grace Hash Join
Date Tue, 03 Mar 2015 00:06:06 GMT


Hive QA commented on HIVE-9277:

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

Here are the results of testing the latest attachment:

{color:red}ERROR:{color} -1 due to 2 failed/errored test(s), 7579 tests executed
*Failed tests:*

Test results:
Console output:
Test logs:

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

This message is automatically generated.

ATTACHMENT ID: 12701966 - PreCommit-HIVE-TRUNK-Build

> Hybrid Hybrid Grace Hash Join
> -----------------------------
>                 Key: HIVE-9277
>                 URL:
>             Project: Hive
>          Issue Type: New Feature
>          Components: Physical Optimizer
>            Reporter: Wei Zheng
>            Assignee: Wei Zheng
>              Labels: join
>         Attachments: HIVE-9277.01.patch, HIVE-9277.02.patch, HIVE-9277.03.patch, HIVE-9277.04.patch,
HIVE-9277.05.patch, HIVE-9277.06.patch, High-leveldesignforHybridHybridGraceHashJoinv1.0.pdf
> We are proposing an enhanced hash join algorithm called _“hybrid hybrid grace hash
> We can benefit from this feature as illustrated below:
> * The query will not fail even if the estimated memory requirement is slightly wrong
> * Expensive garbage collection overhead can be avoided when hash table grows
> * Join execution using a Map join operator even though the small table doesn't fit in
memory as spilling some data from the build and probe sides will still be cheaper than having
to shuffle the large fact table
> The design was based on Hadoop’s parallel processing capability and significant amount
of memory available.

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