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Posted to issues@hive.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2020/07/30 16:21:00 UTC
[jira] [Work logged] (HIVE-23953) Use task counter information to
compute keycount during hashtable loading
[ https://issues.apache.org/jira/browse/HIVE-23953?focusedWorklogId=464630&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-464630 ]
ASF GitHub Bot logged work on HIVE-23953:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 30/Jul/20 16:20
Start Date: 30/Jul/20 16:20
Worklog Time Spent: 10m
Work Description: maheshk114 opened a new pull request #1340:
URL: https://github.com/apache/hive/pull/1340
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Issue Time Tracking
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Worklog Id: (was: 464630)
Remaining Estimate: 0h
Time Spent: 10m
> Use task counter information to compute keycount during hashtable loading
> -------------------------------------------------------------------------
>
> Key: HIVE-23953
> URL: https://issues.apache.org/jira/browse/HIVE-23953
> Project: Hive
> Issue Type: Bug
> Reporter: Rajesh Balamohan
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> There are cases when compiler misestimates key count and this results in a number of hashtable resizes during runtime.
> [https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/exec/vector/mapjoin/fast/VectorMapJoinFastHashTableLoader.java#L128]
> In such cases, it would be good to get "approximate_input_records" (TEZ-4207) counter from upstream to compute the key count more accurately at runtime.
>
> *
> *
> Options
> h4.
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