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[Gluster-devel] Need inputs for fixing 866908


From: Pranith Kumar Karampuri
Subject: [Gluster-devel] Need inputs for fixing 866908
Date: Wed, 12 Dec 2012 03:39:54 -0500 (EST)

hi,
  https://bugzilla.redhat.com/show_bug.cgi?id=866908.
gluster volume heal <vol_name> info" command outputs entries which are in 
".glusterfs" and ".landfill" directory

Reason for the issue:
Whenever a brick is restarted and self-heal has to remove a directory 'dir' it 
sets a flag indicating in rmdir fop that it is 'rm -rf'. The 'dir' is moved to 
'.glusterfs/landfill' by posix because of the flags in rmdir fop, Janitor 
thread removes it asynchronously. gfid-handles exists for 'dir' and files under 
'dir' until the janitor thread deletes them from landfill. Janitor thread is 
run every 10 minutes. Self-heald depends on gfid-handle presence to determine 
that a file exists in the filesystem. Because of this behaviour, stale entries 
show up in the output of 'gluster volume heal <volname> info'. The issue is 
transient, after 10 minutes the stale entries won't show up in the output. One 
way to fix it is by waking up Janitor thread as soon as an rmdir fop comes with 
a special flag indicating that rm -rf needs to happen inside landfill. We can 
even close the issue documenting the behaviour as known issue. Let me know your 
inputs.

Pranith.



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