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From "Hive QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-7832) Do ORC dictionary check at a finer level and preserve encoding across stripes
Date Tue, 26 Aug 2014 14:43:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-7832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14110767#comment-14110767
] 

Hive QA commented on HIVE-7832:
-------------------------------



{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/12664344/HIVE-7832.4.patch

{color:red}ERROR:{color} -1 due to 3 failed/errored test(s), 6122 tests executed
*Failed tests:*
{noformat}
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_dynpart_sort_opt_vectorization
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_vectorization_part_project
org.apache.hive.jdbc.miniHS2.TestHiveServer2.testConnection
{noformat}

Test results: http://ec2-174-129-184-35.compute-1.amazonaws.com/jenkins/job/PreCommit-HIVE-TRUNK-Build/502/testReport
Console output: http://ec2-174-129-184-35.compute-1.amazonaws.com/jenkins/job/PreCommit-HIVE-TRUNK-Build/502/console
Test logs: http://ec2-174-129-184-35.compute-1.amazonaws.com/logs/PreCommit-HIVE-TRUNK-Build-502/

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: 3 tests failed
{noformat}

This message is automatically generated.

ATTACHMENT ID: 12664344

> Do ORC dictionary check at a finer level and preserve encoding across stripes
> -----------------------------------------------------------------------------
>
>                 Key: HIVE-7832
>                 URL: https://issues.apache.org/jira/browse/HIVE-7832
>             Project: Hive
>          Issue Type: Improvement
>    Affects Versions: 0.14.0
>            Reporter: Prasanth J
>            Assignee: Prasanth J
>         Attachments: HIVE-7832.1.patch, HIVE-7832.2.patch, HIVE-7832.3.patch, HIVE-7832.4.patch
>
>
> Currently ORC dictionary check happens while writing the stripe. Just before writing
stripe if ratio of dictionary entries to total non-null rows is greater than threshold then
the dictionary is discarded. Also, the decision of using dictionary or not is preserved across
stripes. This sometimes leads to costly insertion cost of O(logn) for each stripes when there
are too many distinct keys.



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