hi, Pranith,
Thank you for your detailed reply, now I know what the problem is , and I will trace it.
Nice reply, thanks.
Best Regards.
Jules Wang
At 2012-08-01 17:13:51,"Pranith Kumar Karampuri" <pkarampu@xxxxxxxxxx> wrote:
>Jules,
> When a frame hits its time-out 'rpc/rpc-lib/src/rpc-clnt.c:138:call_bail (void *data)' is triggered.
>When the client observes a network disconnection (ping-timer-expiry etc) it triggers 'rpc/rpc-lib/src/rpc-clnt.c:341:saved_frames_unwind (struct saved_frames *saved_frames)'. When a node goes down, ping timer will expire and then the frames are unwound in at max ~42 seconds. So in VM scenario it wont hang for 30 minutes.
>To answer your actual question, why such a big frame timeout: Afr takes entry-locks while performing self-heals, which block other entry fops like create, delete etc. The timeout is put sufficiently large to succeed the entry operations.
>
>Afr used to take a lock on entire file to perform data-self-heal on a regular file, we managed to remove that. We are working on doing the same for entry-self-heal. Once that happens we will be in a good position to change these to lower values.
>
>Pranith.
>
>----- Original Message -----
>From: "Jules Wang" <lancelotds@xxxxxxx>
>To: "devel" <gluster-devel@xxxxxxxxxx>
>Sent: Wednesday, August 1, 2012 1:55:47 PM
>Subject: [Gluster-devel] question on time-out parameters
>
>
>
>hi, all
>When I was tracking the bug https://bugzilla.redhat.com/show_bug.cgi?id=794699
>
>
>I noticed that the default value of "ping-timeout" was 42 and the default value of "frame-timeout" was 1800(30 minutes) (in xlators/protocol/client/src/client.c)
>
>When a node is down(ex. powered off), the volume will be out-of-service for a long time. If there is a vm run on the volume, it will probably get crush.
>
>
>So I wonder why we set large number to these parameters?
>
>Best Regards.
>
>
>Jules Wang
>
>
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