[GitHub] [incubator-druid] himanshug commented on issue #7508: Druid historical node running caused os kernel creating too many kernel's dentry slab objects.

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himanshug commented on issue #7508: Druid historical node running caused os kernel creating too many kernel's dentry slab objects.
URL: https://github.com/apache/incubator-druid/issues/7508#issuecomment-486426100
 
 
   @kaka11chen good find. however I am curious what was the problem observed that led you to this investigation (e.g. you were getting OOMs or CPU usage was shooting up causing everything to become super slow) and did the problem get fixed. From the /proc/meminfo output I see , "MemFree:         3411764 kB"  (about 3G) of free memory and kernel wouldn't try too hard to clean up its internal caches at that point.
   
   I see it is a pathological use case for dentry cache though where we are creating many dentries never to be reused.

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