Re: [MooseFS-Users] Connect attempts to offline chunk server

[Alexander A. <ba...@ya...>]

OK. Thanks a lot! Sorry for impatience.


On 24.01.2018 9:26, Jakub Kruszona-Zawadzki wrote:
>> On 24 Jan, 2018, at 7:16, Alexander AKHOBADZE <ba...@ya...> wrote:
>>
>> Hi again!
>>
>> No solutions? It's a pity ... :--( Is the MooseFS alive?
> Yes it is.
>
> We are working on that.
>
> I usually want to reproduce error and find solution before writing anything.
>
> In my opinion chunksdata cache in mount is the source of this behaviour. We will add mechanism of invalidation this cache on chunkserver disconnection. We'll also short timeouts in mfsmount during first connection and quicker cache invalidation by mount itself. We will let you know.
>
>> Alexander
>>
>>
>>> Hi guys!
>>>
>>> I have a very strange situation (in my opinion).
>>>
>>> I am building a new Moose cluster. By now I have just 2 chunk servers.
>>>
>>> So when one of them is offline MFS client still tryes to connect to it!
>>>
>>> I see it using tcpdump running on MFS client.
>>>
>>> It is strange because MFS master knows  about  offline chunk server (shown as "Disconnected Chunk Servers" on Web-CGI page)
>>>
>>> and it is surprise for my why master points client to the dead chunk server.
>>>
>>> So because of such attempts I have a HUGE !!!!!!! performance degradation and it stops me from running MooseFS in production.
>>>
>>> It there any workaround or fix? Many thanks!
>>>
>>> My environment:
>>>
>>> MFS version: 3.0.99
>>>
>>> Master OS:
>>>
>>> # uname -a
>>> FreeBSD mfs-master-1 11.1-RELEASE-p4 FreeBSD 11.1-RELEASE-p4 #0: Tue Nov 14 06:12:40 UTC 2017 ro...@am...:/usr/obj/usr/src/sys/GENERIC amd64
>>>
>>> Chunk server and client OS:
>>>
>>> # uname -a
>>> Linux proxmox-2 4.13.13-5-pve #1 SMP PVE 4.13.13-36 (Mon, 15 Jan 2018 12:36:49 +0100) x86_64 GNU/Linux
>>> # cat /etc/debian_version
>>> 9.3
>>>
>>> wbr
>>>
>>> Alexander
>>>
>>>
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