From: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
To: Eric Blake <eblake@redhat.com>, qemu-block@nongnu.org
Cc: fam@euphon.net, kwolf@redhat.com, qemu-devel@nongnu.org,
mreitz@redhat.com, stefanha@redhat.com, den@openvz.org,
jsnow@redhat.com
Subject: Re: [PATCH 00/11] mirror: cancel nbd reconnect
Date: Thu, 21 Jan 2021 22:44:23 +0300 [thread overview]
Message-ID: <a76b99e4-afa3-63c7-5d33-523480ce9ba3@virtuozzo.com> (raw)
In-Reply-To: <9929c251-603b-9d22-30c3-d8261d212e1c@redhat.com>
21.01.2021 05:14, Eric Blake wrote:
> On 11/18/20 12:04 PM, Vladimir Sementsov-Ogievskiy wrote:
>> Hi all!
>>
>> The problem
>>
>> Assume we have mirror job with nbd target node with enabled reconnect.
>> Connection failed. So, all current requests to nbd node are waiting for
>> nbd driver to reconnect. And they will wait for reconnect-delay time
>> specified in nbd blockdev options. This timeout may be long enough, for
>> example, we in Virtuozzo use 300 seconds by default.
>>
>> So, if at this moment user tries to cancel the job, job will wait for
>> its in-flight requests to finish up to 300 seconds. From the user point
>> of view, cancelling the job takes a long time. Bad.
>>
>> Solution
>>
>> Let's just cancel "waiting for reconnect in in-flight request coroutines"
>> on mirror (and backup) cancel. Welcome the series below.
>
> Because of my question on 4/11, I did not queue the entire series yet.
> But 6/11 was trivial enough to queue now.
>
Thanks!
--
Best regards,
Vladimir
prev parent reply other threads:[~2021-01-21 19:46 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-18 18:04 [PATCH 00/11] mirror: cancel nbd reconnect Vladimir Sementsov-Ogievskiy
2020-11-18 18:04 ` [PATCH 01/11] block: add new BlockDriver handler: bdrv_cancel_in_flight Vladimir Sementsov-Ogievskiy
2021-01-20 22:27 ` Eric Blake
2021-01-21 18:50 ` Vladimir Sementsov-Ogievskiy
2020-11-18 18:04 ` [PATCH 02/11] block/nbd: implement .bdrv_cancel_in_flight Vladimir Sementsov-Ogievskiy
2021-01-20 23:13 ` Eric Blake
2020-11-18 18:04 ` [PATCH 03/11] block/raw-format: implement .bdrv_cancel_in_flight handler Vladimir Sementsov-Ogievskiy
2021-01-20 23:15 ` Eric Blake
2021-01-21 19:08 ` Vladimir Sementsov-Ogievskiy
2020-11-18 18:04 ` [PATCH 04/11] job: add .cancel handler for the driver Vladimir Sementsov-Ogievskiy
2021-01-20 23:17 ` Eric Blake
2021-01-21 9:32 ` Vladimir Sementsov-Ogievskiy
2020-11-18 18:04 ` [PATCH 05/11] block/mirror: implement .cancel job handler Vladimir Sementsov-Ogievskiy
2021-01-21 1:05 ` Eric Blake
2020-11-18 18:04 ` [PATCH 06/11] iotests/264: fix style Vladimir Sementsov-Ogievskiy
2021-01-21 1:13 ` Eric Blake
2020-11-18 18:04 ` [PATCH 07/11] iotests/264: move to python unittest Vladimir Sementsov-Ogievskiy
2021-01-21 1:17 ` Eric Blake
2021-01-21 19:29 ` Vladimir Sementsov-Ogievskiy
2020-11-18 18:04 ` [PATCH 08/11] iotests.py: qemu_nbd_popen: remove pid file after use Vladimir Sementsov-Ogievskiy
2021-01-21 1:19 ` Eric Blake
2020-11-18 18:04 ` [PATCH 09/11] iotests/264: add mirror-cancel test-case Vladimir Sementsov-Ogievskiy
2021-01-21 1:26 ` Eric Blake
2021-01-21 19:42 ` Vladimir Sementsov-Ogievskiy
2020-11-18 18:04 ` [PATCH 10/11] block/backup: implement .cancel job handler Vladimir Sementsov-Ogievskiy
2021-01-21 1:27 ` Eric Blake
2020-11-18 18:04 ` [PATCH 11/11] iotests/264: add backup-cancel test-case Vladimir Sementsov-Ogievskiy
2021-01-21 1:28 ` Eric Blake
2021-01-21 2:21 ` Eric Blake
2021-01-21 19:43 ` Vladimir Sementsov-Ogievskiy
2020-11-18 18:19 ` [PATCH 00/11] mirror: cancel nbd reconnect Eric Blake
2020-11-18 18:36 ` Vladimir Sementsov-Ogievskiy
2020-12-18 11:05 ` Vladimir Sementsov-Ogievskiy
2021-01-09 10:11 ` Vladimir Sementsov-Ogievskiy
2021-01-21 2:14 ` Eric Blake
2021-01-21 19:44 ` Vladimir Sementsov-Ogievskiy [this message]
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