[Ocfs2-devel] [PATCH 0/3] ocfs2: o2net: fix packets lost issue when reconnect

[Junxiao Bi]

Hi Mark & Andrew,

Could you help review this patch list?
This bug can be saw when network state go bad. It may cause ocfs2 hung
forever if some packets lost. With this fix, ocfs2 will recover from
hung if network becomes good.

Thanks,
Junxiao.

On 05/15/2014 12:26 PM, Junxiao Bi wrote:
> Hi,
>
> After the tcp connection is established between two ocfs2 nodes, an idle
> timer will be set to check its state periodically, if no messages are
> received during this time, idle timer will timeout, it will shutdown
> the connection and try to rebuild, so pending message in tcp queues will
> be lost. This may cause the whole ocfs2 cluster hung. 
> This is very possible to happen when network state goes bad. Do the
> reconnect is useless, it will fail if network state doesn't recover.
> Just waiting there for network recovering may be a good idea, it will
> not lost messages and some node will be fenced until cluster goes into
> split-brain state, for this case, Tcp user timeout is used to override
> the tcp retransmit timeout. It will timeout after 25 days, user should
> have notice this through the provided log and fix the network, if they
> don't, ocfs2 will fall back to original reconnect way.
> The following is the serial of patches to fix the bug. Please help review.
>
> Thanks,
> Junxiao.
>
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