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From: Achilleas Mantzios <achill@matrix.gatewaynet.com>
To: pgsql-admin@lists.postgresql.org
Subject: Re: PostgreSQL 10.5 : Logical replication timeout results in PANIC in pg_wal "No space left on device"
Date: Wed, 21 Nov 2018 08:03:57 +0200
Message-ID: <b34279c0-14ea-bf3b-61a4-109792059e09@matrix.gatewaynet.com> (raw)
In-Reply-To: <14A9158A-B487-4DB6-84FC-0B04F08D69A2@crazybean.net>
References: <ae8812c3-d138-73b7-537a-a273e15ef6e1@matrix.gatewaynet.com>
	<838a3914-a078-88eb-ee5e-4059b7d14620@matrix.gatewaynet.com>
	<0BBC4BB3-4A59-4040-B065-82D09268A4F7@crazybean.net>
	<48415b2a-ea0f-cf5e-1145-17e8797a6e79@matrix.gatewaynet.com>
	<739822AC-E20F-493B-8B4F-8AF78A8276D0@crazybean.net>
	<c0651fcb-95e9-3fe8-ce34-122c5090c826@matrix.gatewaynet.com>
	<946FBD41-7BAF-4414-8FB9-C0F16A0680F6@crazybean.net>
	<fae91c5d-3c64-a968-2ab5-95bd59442b09@matrix.gatewaynet.com>
	<14A9158A-B487-4DB6-84FC-0B04F08D69A2@crazybean.net>


On 20/11/18 10:48 μ.μ., Rui DeSousa wrote:
>
>
>> On Nov 20, 2018, at 3:34 PM, Achilleas Mantzios 
>> <achill@matrix.gatewaynet.com <mailto:achill@matrix.gatewaynet.com>> 
>> wrote:
>>
>> Hey, I was reading the docs, it seems it means :
>>
>> net.ipv4.tcp_keepalive_time + net.ipv4.tcp_keepalive_intvl * 
>> net.ipv4.tcp_keepalive_probes = 2hrs 11 Mins 15 Secs, rather than 18 Hrs
>
> Yeah, that’s correct.  I wonder why it didn’t terminate.


Most probably because there was another created clone, cloud migration 
magic, that's my theory, albeit not confirmed by the provider. Logical 
worker (walreceiver) was still alive and happy even after the primary 
crushed. I have the logs from the other standby and it immediately 
detected the problem (PANIC on the primary) and retried. No firewall 
dropping packets, in every test I did, the logical bgworker detects any 
problems *instantly*, and retries after 5 secs by default.

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