XMemcached pooled client Recv Q size is very high

[auror]

Hi,

We've been using XMemcachedClient connected to twemproxy which sits behind set of memcached servers. We've kept a OpTimeout of 30 ms.

Over the time, the Recv Q(from netstat) size of the tcp socket grows really high and prompting timeouts from XMemcached. Twemproxy as a result is also getting killed by going OOM gradually

Is XMemcached client slow in receiving data? Should TCP_RECV_BUFF_SIZE be increased?

Few more details:

1. XMemcached version: 2.4.0
2. Protocol: Text Protocol
3. Session Idle Timeout: 60 secs
4. timeoutExceptionThreshold: 250000
5. healSessionInterval: 1 sec
6. Pool Size: 20
7. Throughput: ~ 2.2K QPS

[killme2008]

2.2 K QPS is not heavy load, is your data too large?

But you may try to disable the connection pool,it's not recommended.

[auror]

Hi,

When there's a read timeout on a call, the connection is getting closed and we wanted to avoid that problem by using connection pool. Also we couldn't afford high response time spikes quite often

Thanks

On Wed, Aug 1, 2018 at 5:24 PM dennis zhuang [email protected] wrote:

2.2 K QPS is not heavy load, is your data too large?

But you may try to disable the connection pool,it's not recommended.

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[sabhishekgowda]

@killme2008 I'm facing the same issue, our data is too large. Can you please help?