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https://issues.apache.org/jira/browse/HDDS-8289?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wei-Chiu Chuang resolved HDDS-8289.
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Fix Version/s: 1.4.0
Resolution: Fixed
> Get splits in tpcds queries are way higher (10-30+ seconds) causing slowness
> on FSO bucket
> ------------------------------------------------------------------------------------------
>
> Key: HDDS-8289
> URL: https://issues.apache.org/jira/browse/HDDS-8289
> Project: Apache Ozone
> Issue Type: Bug
> Reporter: Rajesh Balamohan
> Assignee: Ritesh Shukla
> Priority: Critical
> Labels: pull-request-available
> Fix For: 1.4.0
>
>
> *Context:*
> Some queries run in Ozone were much slower than HDFS (1 TB tpcds orc format).
> *Issue:*
> getSplits in AM is super slow causing the slowness. Though getSplits run in
> multithreaded mode for ORC, it is still slower due to internal "listStatus"
> calls. Yet to get details on why listStatus calls are slow from Ozone side.
> Attaching AM logs here for later reference.
> Attaching AM log snippet for Q44; spent 36+ seconds in getSplits:
> Q44:
> {noformat}
> 2023-03-26 21:10:04,421 [INFO] [App Shared Pool - #25] |orc.OrcInputFormat|:
> getSplits finished (#splits: 44). duration: 36595 ms
> 2023-03-26 21:10:04,594 [INFO] [App Shared Pool - #24] |orc.OrcInputFormat|:
> getSplits finished (#splits: 1917). duration: 36727 ms
> 2023-03-26 21:10:04,698 [INFO] [App Shared Pool - #27] |orc.OrcInputFormat|:
> getSplits finished (#splits: 44). duration: 36816 ms
> 2023-03-26 21:10:04,855 [INFO] [App Shared Pool - #26] |orc.OrcInputFormat|:
> getSplits finished (#splits: 1917). duration: 36907 ms
> 2023-03-26 21:10:05,051 [INFO] [App Shared Pool - #28] |orc.OrcInputFormat|:
> getSplits finished (#splits: 1917). duration: 37070 ms
> {noformat}
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