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https://issues.apache.org/jira/browse/HBASE-28953?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wellington Chevreuil resolved HBASE-28953.
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Resolution: Fixed
Merged to master, branch-3, branch-2 and branch-2.6.
> Prefetch thread shouldn't run for master store
> ----------------------------------------------
>
> Key: HBASE-28953
> URL: https://issues.apache.org/jira/browse/HBASE-28953
> Project: HBase
> Issue Type: Bug
> Affects Versions: 3.0.0-beta-1, 2.7.0, 2.6.1
> Reporter: Wellington Chevreuil
> Assignee: Wellington Chevreuil
> Priority: Minor
> Labels: pull-request-available
> Fix For: 3.0.0, 2.7.0, 2.6.2
>
>
> The master store is hosted on Master processes. Since masters don't have a
> BlockCache, we shouldn't run a prefetch thread at all, when opening the
> master store region.
> Currently, this is causing a NoSuchElementException to be logged in master
> logs, which although harmless, can be confusing for operators:
> {noformat}
> 2024-10-23 15:23:29,236 WARN
> org.apache.hadoop.hbase.io.hfile.HFileReaderImpl: Prefetch
> path=s3a://odx-qe-bucket/cc-odx-coy6zg/cod-udzhubgp5l5k/hbase/MasterData/data/master/store/1595e783b53d99cd5eef43b6debb2682/proc/336a510d9f9a472c9e2a8f3e00352e3b,
> offset=0, end=82012
> java.util.NoSuchElementException: No value present
> at java.base/java.util.Optional.get(Optional.java:143)
> at
> org.apache.hadoop.hbase.io.hfile.HFilePreadReader$1.run(HFilePreadReader.java:73)
> at
> java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539)
> at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
> at
> java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304)
> at
> java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
> at java.base/java.util.concurrent.ThreadPoolExecute {noformat}
>
>
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