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Posted to hdfs-dev@hadoop.apache.org by "Elliott Clark (JIRA)" <ji...@apache.org> on 2015/09/16 02:25:46 UTC

[jira] [Resolved] (HDFS-7492) If multiple threads call FsVolumeList#checkDirs at the same time, we should only do checkDirs once and give the results to all waiting threads

     [ https://issues.apache.org/jira/browse/HDFS-7492?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Elliott Clark resolved HDFS-7492.
---------------------------------
    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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