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https://issues.apache.org/jira/browse/TAJO-1809?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14730535#comment-14730535
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Hudson commented on TAJO-1809:
------------------------------
FAILURE: Integrated in Tajo-master-CODEGEN-build #476 (See
[https://builds.apache.org/job/Tajo-master-CODEGEN-build/476/])
TAJO-1809: Change default value of several configurations. (jihoonson: rev
7e0a4a1e4686314feed22c7a352c9c70ef8a0e40)
* tajo-core/src/main/java/org/apache/tajo/querymaster/Stage.java
* tajo-core-tests/src/test/java/org/apache/tajo/engine/query/TestJoinQuery.java
* tajo-common/src/main/java/org/apache/tajo/conf/TajoConf.java
*
tajo-core/src/main/java/org/apache/tajo/engine/planner/PhysicalPlannerImpl.java
*
tajo-core-tests/src/test/resources/results/TestTajoCli/testHelpSessionVars.result
* tajo-common/src/main/java/org/apache/tajo/SessionVars.java
*
tajo-common/src/main/java/org/apache/tajo/exception/TooLargeInputForCrossJoinException.java
* CHANGES
*
tajo-core-tests/src/test/java/org/apache/tajo/engine/planner/physical/TestHashJoinExec.java
*
tajo-core/src/main/java/org/apache/tajo/engine/planner/global/rewriter/rules/BroadcastJoinRule.java
*
tajo-plan/src/main/java/org/apache/tajo/plan/verifier/PostLogicalPlanVerifier.java
> Change default value of several configurations
> ----------------------------------------------
>
> Key: TAJO-1809
> URL: https://issues.apache.org/jira/browse/TAJO-1809
> Project: Tajo
> Issue Type: Task
> Components: conf and scripts
> Reporter: Jihoon Son
> Assignee: Jihoon Son
> Fix For: 0.11.0
>
> Attachments: TAJO-1809.patch, TAJO-1809_2.patch
>
>
> Tajo has many configurations. For the sake of user convenience, they all have
> some default value. Most of default values make sense, but some are not. Here
> is my idea.
> * Tajo can choose hash-based algorithm and disk-based algorithm according to
> the remaining resource and query workload. Here, users can give a hint using
> session variables whose name is HASH_*_SIZE_LIMIT. Their current default
> value is 256 MB, but it's too large thereby incurring GC so often, and even
> OOM sometimes.
> * Query cache should be disabled by default. It will not be commonly used.
> * Configurations for broadcast join should accept numbers in MB.
> * Some configurations allow different unit in tajo-site.xml and session
> variable. This must be consistent.
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