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Posted to issues@hive.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2022/12/05 08:18:00 UTC
[jira] [Work logged] (HIVE-26788) Update stats of table/partition after minor compaction using noscan operation
[ https://issues.apache.org/jira/browse/HIVE-26788?focusedWorklogId=830956&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-830956 ]
ASF GitHub Bot logged work on HIVE-26788:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 05/Dec/22 08:17
Start Date: 05/Dec/22 08:17
Worklog Time Spent: 10m
Work Description: deniskuzZ commented on code in PR #3812:
URL: https://github.com/apache/hive/pull/3812#discussion_r1039279154
##########
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:
why `noscan` is used only in case of minor compaction?
Issue Time Tracking
-------------------
Worklog Id: (was: 830956)
Time Spent: 40m (was: 0.5h)
> Update stats of table/partition after minor compaction using noscan operation
> -----------------------------------------------------------------------------
>
> 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: 40m
> Remaining Estimate: 0h
>
> Currently, statistics are not 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 minor 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.
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