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https://issues.apache.org/jira/browse/HDFS-7492?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Elliott Clark resolved HDFS-7492.
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Resolution: Duplicate
Fixed in HDFS-7531. Since there are no more locks on FsVolumeList there isn't a
contention.
> If multiple threads call FsVolumeList#checkDirs at the same time, we should
> only do checkDirs once and give the results to all waiting threads
> ----------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-7492
> URL: https://issues.apache.org/jira/browse/HDFS-7492
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Reporter: Colin Patrick McCabe
> Assignee: Elliott Clark
> Priority: Minor
>
> checkDirs is called when we encounter certain I/O errors. It's rare to get
> just a single I/O error... normally you start getting many errors when a disk
> is going bad. For this reason, we shouldn't start a new checkDirs scan for
> each error. Instead, if multiple threads call FsVolumeList#checkDirs at
> around the same time, we should only do checkDirs once and give the results
> to all the waiting threads.
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