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Posted to issues@hive.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2020/11/09 17:22:00 UTC
[jira] [Work logged] (HIVE-24313) Optimise stats collection for
file sizes on cloud storage
[ https://issues.apache.org/jira/browse/HIVE-24313?focusedWorklogId=509264&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-509264 ]
ASF GitHub Bot logged work on HIVE-24313:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 09/Nov/20 17:21
Start Date: 09/Nov/20 17:21
Worklog Time Spent: 10m
Work Description: vineetgarg02 commented on pull request #1636:
URL: https://github.com/apache/hive/pull/1636#issuecomment-724154844
@rbalamohan can you take a look please?
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Issue Time Tracking
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Worklog Id: (was: 509264)
Remaining Estimate: 0h
Time Spent: 10m
> Optimise stats collection for file sizes on cloud storage
> ---------------------------------------------------------
>
> Key: HIVE-24313
> URL: https://issues.apache.org/jira/browse/HIVE-24313
> Project: Hive
> Issue Type: Improvement
> Components: HiveServer2
> Reporter: Rajesh Balamohan
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> When stats information is not present (e.g external table), RelOptHiveTable computes basic stats at runtime.
> Following is the codepath.
> [https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/optimizer/calcite/RelOptHiveTable.java#L598]
> {code:java}
> Statistics stats = StatsUtils.collectStatistics(hiveConf, partitionList,
> hiveTblMetadata, hiveNonPartitionCols, nonPartColNamesThatRqrStats, colStatsCached,
> nonPartColNamesThatRqrStats, true);
> {code}
> [https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/stats/StatsUtils.java#L322]
> {code:java}
> for (Partition p : partList.getNotDeniedPartns()) {
> BasicStats basicStats = basicStatsFactory.build(Partish.buildFor(table, p));
> partStats.add(basicStats);
> }
> {code}
> [https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/stats/BasicStats.java#L205]
>
> {code:java}
> try {
> ds = getFileSizeForPath(path);
> } catch (IOException e) {
> ds = 0L;
> }
> {code}
>
> For a table & query with large number of partitions, this takes long time to compute statistics and increases compilation time. It would be good to fix it with "ForkJoinPool" ( partList.getNotDeniedPartns().parallelStream().forEach((p) )
>
>
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