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Posted to issues@hive.apache.org by "László Pintér (Jira)" <ji...@apache.org> on 2022/01/04 11:57:00 UTC
[jira] [Assigned] (HIVE-25842) Reimplement delta file metric collection
[ https://issues.apache.org/jira/browse/HIVE-25842?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
László Pintér reassigned HIVE-25842:
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> Reimplement delta file metric collection
> ----------------------------------------
>
> Key: HIVE-25842
> URL: https://issues.apache.org/jira/browse/HIVE-25842
> Project: Hive
> Issue Type: Improvement
> Reporter: László Pintér
> Assignee: László Pintér
> Priority: Major
>
> FUNCTIONALITY: Metrics are collected only when a Tez query runs a table (select * and select count( * ) don't update the metrics)
> Metrics aren't updated after compaction or cleaning after compaction, so users will probably see "issues" with compaction (like many active or obsolete or small deltas) that don't exist.
> RISK: Metrics are collected during queries – we tried to put a try-catch around each method in DeltaFilesMetricsReporter but of course this isn't foolproof. This is a HUGE performance and functionality liability. Tests caught some issues, but our tests aren't perfect.
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