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From "Hive QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-9995) ACID compaction tries to compact a single file
Date Thu, 21 Mar 2019 23:47:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-9995?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16798554#comment-16798554
] 

Hive QA commented on HIVE-9995:
-------------------------------



Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12963282/HIVE-9995.04.patch

{color:red}ERROR:{color} -1 due to build exiting with an error

Test results: https://builds.apache.org/job/PreCommit-HIVE-Build/16619/testReport
Console output: https://builds.apache.org/job/PreCommit-HIVE-Build/16619/console
Test logs: http://104.198.109.242/logs/PreCommit-HIVE-Build-16619/

Messages:
{noformat}
Executing org.apache.hive.ptest.execution.TestCheckPhase
Tests exited with: Exception: Patch URL https://issues.apache.org/jira/secure/attachment/12963282/HIVE-9995.04.patch
was found in seen patch url's cache and a test was probably run already on it. Aborting...
{noformat}

This message is automatically generated.

ATTACHMENT ID: 12963282 - PreCommit-HIVE-Build

> ACID compaction tries to compact a single file
> ----------------------------------------------
>
>                 Key: HIVE-9995
>                 URL: https://issues.apache.org/jira/browse/HIVE-9995
>             Project: Hive
>          Issue Type: Bug
>          Components: Transactions
>    Affects Versions: 1.0.0
>            Reporter: Eugene Koifman
>            Assignee: Denys Kuzmenko
>            Priority: Major
>         Attachments: HIVE-9995.01.patch, HIVE-9995.02.patch, HIVE-9995.03.patch, HIVE-9995.04.patch,
HIVE-9995.WIP.patch
>
>
> Consider TestWorker.minorWithOpenInMiddle()
> since there is an open txnId=23, this doesn't have any meaningful minor compaction work
to do.  The system still tries to compact a single delta file for 21-22 id range, and effectively
copies the file onto itself.
> This is 1. inefficient and 2. can potentially affect a reader.
> (from a real cluster)
> Suppose we start with 
> {noformat}
> drwxr-xr-x   - ekoifman staff          0 2016-06-09 16:03 /user/hive/warehouse/t/base_0000016
> -rw-r--r--   1 ekoifman staff        602 2016-06-09 16:03 /user/hive/warehouse/t/base_0000016/bucket_00000
> drwxr-xr-x   - ekoifman staff          0 2016-06-09 16:07 /user/hive/warehouse/t/base_0000017
> -rw-r--r--   1 ekoifman staff        588 2016-06-09 16:07 /user/hive/warehouse/t/base_0000017/bucket_00000
> drwxr-xr-x   - ekoifman staff          0 2016-06-09 16:07 /user/hive/warehouse/t/delta_0000017_0000017_0000
> -rw-r--r--   1 ekoifman staff        514 2016-06-09 16:06 /user/hive/warehouse/t/delta_0000017_0000017_0000/bucket_00000
> drwxr-xr-x   - ekoifman staff          0 2016-06-09 16:07 /user/hive/warehouse/t/delta_0000018_0000018_0000
> -rw-r--r--   1 ekoifman staff        612 2016-06-09 16:07 /user/hive/warehouse/t/delta_0000018_0000018_0000/bucket_00000
> {noformat}
> then do _alter table T compact 'minor';_
> then we end up with 
> {noformat}
> drwxr-xr-x   - ekoifman staff          0 2016-06-09 16:07 /user/hive/warehouse/t/base_0000017
> -rw-r--r--   1 ekoifman staff        588 2016-06-09 16:07 /user/hive/warehouse/t/base_0000017/bucket_00000
> drwxr-xr-x   - ekoifman staff          0 2016-06-09 16:11 /user/hive/warehouse/t/delta_0000018_0000018
> -rw-r--r--   1 ekoifman staff        500 2016-06-09 16:11 /user/hive/warehouse/t/delta_0000018_0000018/bucket_00000
> drwxr-xr-x   - ekoifman staff          0 2016-06-09 16:07 /user/hive/warehouse/t/delta_0000018_0000018_0000
> -rw-r--r--   1 ekoifman staff        612 2016-06-09 16:07 /user/hive/warehouse/t/delta_0000018_0000018_0000/bucket_00000
> {noformat}
> So compaction created a new dir _/user/hive/warehouse/t/delta_0000018_0000018_



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