[zeromq-dev] Delay in receive by SUB from PUB

Jeff Shanab jshanab at jfs-tech.com
Sat Mar 12 14:07:11 CET 2016

I have seen this when I make a mistake and over-consume from the publisher
on multipart messages. the subscriber then blocks.
In my case the next message eventually comes along and things resume, but
out of sync.

To avoid this I created a small class that recvies the entire multipart
message then it either has or has not enough "frames."
I separated my interpretation of the frames from their recv.

On Fri, Mar 11, 2016 at 6:39 AM, Navneet Kumar <navneet.krg at gmail.com>

> Hello everone
> I am building a pubsub, wherein the PUB and the SUB socket are on the same
> host.
> I am able to send lots of messages through it. The latency of the system
> is around 2-50 ms.
> But out of blue some messages get stuck for 5-6 seconds before receiving.
> I have put the logs and added timestamps to the message itself.
> The publisher publishes and sets the time stamp, the subscriber timestamp
> has a
> difference of 5-10 seconds. This occurs for roughly 1 in 1000 messages.
> I am using aws c4.xlarge machine. I tried ss and there were few blips in
> the recv and send queue.
> If i am sending lots of messages in bulk then it sometimes get stuck and
> the resumes, with no
> messages being lost. Sometimes a single message itself without any other
> load gets stuck.
> Has anyone faced such a scenario or give any pointers to look.
> --
> Navneet Kumar
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