FUN with problems: Start with Gearman

1. Install gearman, server and client:

$ sudo apt-get install gearman-job-server

2. Creat gearmand log file:

$ mkdir ~/log/gearmand
$ touch ~/log/gearmand/gearmand.log
$ cd ~/log/gearmand

3. Start gearman server on localhost (127.0.0.1), port 4730

$ gearmand --log-file gearmand.log --listen 127.0.0.1 --port=4730 --verbose=INFO

4. Register gearman worker (with funciton name wwcc):

$ gearman -w -h 127.0.0.1 -p 4730 -f wwcc -- wc -l

5. Send data/request from a gearman client:

$ gearman -h 127.0.0.1 -p 4730 -f wwcc < /etc/passwd
$ gearman -h 127.0.0.1 -p 4730 -f wwcc "hello world"

6. The stdout on terminal shows the result, something like:

48 78 2409
0 2 11

For default localhost:4730, step 3 can be simplified to, (in addtion, running in background):

$gearmand -d -l gearmand.log

$man gearman
$man gearmand
$gearmand -h
$man gearadmin

Related error messages:

gearmand: Could not open log file "/usr/local/var/log/gearmand.log", from "/home", switching to stderr. (Permission denied)

This means the access to gearmand.log file is limited (owned by root?). Creating a new log file solves this problem (step 2 above).

gearman: gearman_client_run_tasks : flush(GEARMAN_COULD_NOT_CONNECT) localhost:0 -> libgearman/connection.cc:672

The gearmand server is not running, or binds to a different address:port than requested. (step 3 above)

gearmand: unknown option -v

The -v option is not suppored in new versions. use: --verbose=INFO (step 3 above)

ERROR 2013-04-13 22:15:55.000000 [ main ] Timeout occured when calling bind() for 0.0.0.0:4730 -> libgearman-server/gearmand.cc:616

The listen to address is bad. Specify localhost by -h 127.0.0.1 (step3,4,5 above)

gearmand: error while loading shared libraries: libboost_program_options.so.1.48.0: cannot open shared object file: No such file or directory

$sudo apt-get install libboost-program-options1.48.0
After some updates, the old boost lib was autoremoved. Just reinstall it and problem solved.

FUN with problems