[Bugs] [Bug 1417028] New: option performance.parallel-readdir can cause OOM in large volumes

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1417028

            Bug ID: 1417028
           Summary: option performance.parallel-readdir can cause OOM in
                    large volumes
           Product: GlusterFS
           Version: 3.10
         Component: unclassified
          Assignee: bugs at gluster.org
          Reporter: rgowdapp at redhat.com
                CC: bugs at gluster.org



Description of problem: With performance.parallel-readdir enabled, a
readdir-ahead is loaded in each subvolume of DHT. Though individual
readdir-ahead has a limit on the amount of memory used for caching, there is no
limit on the number of subvolumes to DHT and hence the number of readdir-ahead
in graph can be large. The cumulative cache size of all readdir-ahead xlators
can be huge in such a scenario. So, there should be a way to limit the amount
of total cache consumed by all readdir-ahead xlators in a large volume


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