Ethan Rose created HDDS-8191:
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             Summary: Avoid false positive failures in scanners
                 Key: HDDS-8191
                 URL: https://issues.apache.org/jira/browse/HDDS-8191
             Project: Apache Ozone
          Issue Type: Sub-task
            Reporter: Ethan Rose


Sometimes volume or container scan may fail due to external issues in the file 
system or operation system that do not affect the content of the containers or 
volumes and are caused by simple admin mistakes. This jira proposes having the 
following failures be logged by the scanners but not cause their contents to be 
marked unhealthy:
* Too many open files
** Can be fixed by the admin adjusting the file descriptor limit for the node.
* Permission denied for reading or writing.
** Can be fixed by the admin fixing filesystem permissions.
* No space left on device
** Should be prevented by configuring hdds.datanode.dir.du.reserved.percent to 
leave some free space on the volume.
** Failing full volumes could put an already full cluster in a worse state by 
triggering replication.




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