[Gluster-users] Very poor heal behaviour in 3.7.9

Ravishankar N ravishankar at redhat.com
Fri Mar 25 14:14:02 UTC 2016

On 03/25/2016 07:28 PM, Lindsay Mathieson wrote:
> On 25/03/2016 10:33 PM, Krutika Dhananjay wrote:
>> There is one bug that was uncovered recently wherein the same file 
>> could possibly get healed twice before marking that it no longer 
>> needs a heal.
>> Pranith sent a patch @ http://review.gluster.org/#/c/13766/ to fix 
>> this, although IIUC this bug existed in versions < 3.7.9 as well.
>> Also because of this bug, files that need heal may appear in 
>> heal-info output longer than they ought to.
>> Did you see this issue in versions < 3.7.9 as well?
> The slow I/O? No I didn't - and that's my big concern as the cluster 
> is unusable for extended periods while its happening.

I think you need the exact no. of files and size of files that need 
healing to make any meaningful comparison of self-heal performance 
across versions.
VM workloads with sharding might not be the ideal 'reproducer' since you 
really don't know how many shards get modified when a replica is down 
and I/O on the VMs happen. I suppose you could try testing the heal 
performance of a specific no. of files on a sharded volume and compare 

My 2 cents.

> I didn't notice double heals happening previously, but I doubt I would 
> have if it was happening.
> thanks,

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