Compatibility with php gearmanclient

[websmurf]

Hi

We're currently in the process of migrating our legacy application to a kubernetes cluster with your Gearman server. We running into a weird timeout issue when trying to insert jobs (or a simple ping command from php). It makes me wonder whether if there a reason why the Gearman PECL php package wouldn't work with the Go server?

If I connect to the Gearman server instance from the same pod as the php code is running in through telnet, everything works fine; when trying to run a simple php script against it, it just hangs.

Telnet command & response:

root@test-5cf49f485b-248k9:/var/www# telnet gearmand 4730
Trying 10.99.14.245...
Connected to gearmand.default.svc.cluster.local.
Escape character is '^]'.

php script:

<?php
error_reporting(E_ALL);
ini_set('display_errors', 'on');

$client = new GearmanClient();
$client->addServers('gearmand:4730');

print_r($client->ping('test'));
print_r($client->error());

libgearman version: 1.0.6

When I execute the php script, it just hangs indefiniately. Any idea what this could be?

This is (part of) the output of a strace on the process:

 0.000384 connect(3, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("10.96.0.10")}, 16) = 0
     0.000157 poll([{fd=3, events=POLLOUT}], 1, 0) = 1 ([{fd=3, revents=POLLOUT}])
     0.000237 sendmmsg(3, [{msg_hdr={msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\361\r\1\0\0\1\0\0\0\0\0\0\10gearmand\7default\3sv"..., iov_len=52}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, msg_len=52}, {msg_hdr={msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\r2\1\0\0\1\0\0\0\0\0\0\10gearmand\7default\3sv"..., iov_len=52}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, msg_len=52}], 2, MSG_NOSIGNAL) = 2
     0.000586 poll([{fd=3, events=POLLIN}], 1, 5000) = 1 ([{fd=3, revents=POLLIN}])
     0.000106 ioctl(3, FIONREAD, [68])  = 0
     0.000120 recvfrom(3, "\361\r\205\200\0\1\0\1\0\0\0\0\10gearmand\7default\3sv"..., 2048, 0, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("10.96.0.10")}, [28->16]) = 68
     0.000335 poll([{fd=3, events=POLLIN}], 1, 4998) = 1 ([{fd=3, revents=POLLIN}])
     0.000117 ioctl(3, FIONREAD, [106]) = 0
     0.000110 recvfrom(3, "\r2\205\200\0\1\0\0\0\1\0\0\10gearmand\7default\3sv"..., 65536, 0, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("10.96.0.10")}, [28->16]) = 106
     0.000128 close(3)                  = 0
     0.000145 socket(AF_INET, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, IPPROTO_TCP) = 3
     0.000115 setsockopt(3, SOL_TCP, TCP_NODELAY, [1], 4) = 0
     0.000107 setsockopt(3, SOL_SOCKET, SO_LINGER, {onoff=1, linger=10}, 8) = 0
     0.000169 setsockopt(3, SOL_SOCKET, SO_KEEPALIVE, [1], 4) = 0
     0.000115 setsockopt(3, SOL_SOCKET, SO_SNDBUF, [32768], 4) = 0
     0.000176 setsockopt(3, SOL_SOCKET, SO_RCVBUF, [32768], 4) = 0
     0.000143 connect(3, {sa_family=AF_INET, sin_port=htons(4730), sin_addr=inet_addr("10.99.14.245")}, 16) = -1 EINPROGRESS (Operation now in progress)
     0.000504 poll([{fd=3, events=POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
     0.000225 sendto(3, "\0REQ\0\0\0\32\0\0\0\nexceptions", 22, MSG_NOSIGNAL, NULL, 0) = 22
     0.000268 recvfrom(3, 0x55aae1dad9b1, 8192, MSG_NOSIGNAL, NULL, NULL) = -1 EAGAIN (Resource temporarily unavailable)
     0.000151 poll([{fd=3, events=POLLIN}], 1, -1

Log on the gearman g2 pod:

I1222 13:45:23.108439       1 session.go:46] new session with sessionId 32 and address: 172.17.0.21:34440
I1222 13:45:23.108499       1 session.go:82] incoming<= sessionId: 32 protocol: PT_OptionReq len(args): 1 details: exceptions
I1222 13:45:23.108503       1 session.go:176] not support type PT_OptionReq

[tamalsaha]

I am not sure what the problem is. Any chance you can try with the latest version of libgearman http://pecl.php.net/package/gearman ?

[websmurf]

Sorry for the delay in response, but it appears to be an issue in the pecl package. With Net_Gearman (https://github.com/brianlmoon/net_gearman) it works alright.