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Posted to issues@hive.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2021/05/20 05:37:00 UTC
[jira] [Work logged] (HIVE-25142) Rehashing in map join fast hash
table causing corruption for large keys
[ https://issues.apache.org/jira/browse/HIVE-25142?focusedWorklogId=599619&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-599619 ]
ASF GitHub Bot logged work on HIVE-25142:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 20/May/21 05:36
Start Date: 20/May/21 05:36
Worklog Time Spent: 10m
Work Description: maheshk114 opened a new pull request #2300:
URL: https://github.com/apache/hive/pull/2300
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Issue Time Tracking
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Worklog Id: (was: 599619)
Remaining Estimate: 0h
Time Spent: 10m
> Rehashing in map join fast hash table causing corruption for large keys
> ------------------------------------------------------------------------
>
> Key: HIVE-25142
> URL: https://issues.apache.org/jira/browse/HIVE-25142
> Project: Hive
> Issue Type: Bug
> Components: Hive
> Reporter: mahesh kumar behera
> Assignee: mahesh kumar behera
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> In map join the hash table is created using the keys. To support rehashing, the keys are stored in write buffer. The hash table contains the offset of the keys along with the hash code. When rehashing is done, the offset is extracted from the hash table and then hash code is generated again. For large keys of size greater than 255, the key length is also stored along with the key. In case of fast hash table implementation the way key is extracted is not proper. There is a code bug and thats causing the wrong key to be extracted and causing wrong hash code generation. This is causing the corruption in the hash table.
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