Recv-Q not decreasing when startup

[xiaofud]

We're using lettuce-core 5.3.7.RELEASE in cluster mode (async api), and we have two docker images which are based on java 1.8.0_101-b13 and 1.8.0_201-b09(I don't have the docker file for these images, but the main difference should be java version).

Everything on 101 image is fine, but timeout problem happens in 201 image. On 201 image, after our application starts, the redis call just hangs, we have tried different timeout settings, but we don't even get a timeout exception. After several minutes(different duration each time, no obvious pattern), the redis client gets back to normal, redis command works just fine.

On 201 image during hangs period, we noticed the Recv-Q (output of ss command) value of connection to redis clsuter was not zero and wouldn't decrease for sometime, but same situation never happens on 101 image.

Any thoughts on how should I troubleshoot this problem? Thanks.