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Posted to issues@hive.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2022/12/07 07:35:00 UTC
[jira] [Work logged] (HIVE-26788) Update stats of table/partition using noscan operation when stats autogather is enabled
[ https://issues.apache.org/jira/browse/HIVE-26788?focusedWorklogId=831657&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-831657 ]
ASF GitHub Bot logged work on HIVE-26788:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 07/Dec/22 07:34
Start Date: 07/Dec/22 07:34
Worklog Time Spent: 10m
Work Description: SourabhBadhya commented on code in PR #3812:
URL: https://github.com/apache/hive/pull/3812#discussion_r1041851008
##########
ql/src/java/org/apache/hadoop/hive/ql/txn/compactor/StatsUpdater.java:
##########
@@ -73,6 +69,9 @@ public void gatherStats(CompactionInfo ci, HiveConf conf, String userName, Strin
sb.append(")");
}
sb.append(" compute statistics");
+ if (ci.isMinorCompaction()) {
+ sb.append(" noscan");
Review Comment:
Updated this to perform noscan only when autostats gather is enabled irrespective of whether minor/major compaction is triggered.
Issue Time Tracking
-------------------
Worklog Id: (was: 831657)
Time Spent: 1h 50m (was: 1h 40m)
> Update stats of table/partition using noscan operation when stats autogather is enabled
> ---------------------------------------------------------------------------------------
>
> Key: HIVE-26788
> URL: https://issues.apache.org/jira/browse/HIVE-26788
> Project: Hive
> Issue Type: Improvement
> Reporter: Sourabh Badhya
> Assignee: Sourabh Badhya
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1h 50m
> Remaining Estimate: 0h
>
> Currently, statistics are always updated for major compaction and never updated for minor compaction since minor compaction performs little updates on the statistics (such as number of files in table/partition & total size of the table/partition). It is better to utilize NOSCAN operation for both these compaction since NOSCAN operations performs faster update of statistics and updates the relevant fields such as number of files & total sizes of the table/partitions if stats autogather is enabled. If autostats gather is disabled then go for full update of statistics.
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