In beanstalkd
telnet localhost 11300
USING foo
put 0 100 120 5
hello
INSERTED 1
How can I know what is the priority of this job when I reserve it? And can I release it by making the new priority equals to current priority +100?
Beanstalkd doesn't return the priority with the data - but you could easily add it as metadata in your own message body. for example, with Json as a message wrapper:
{'priority':100,'timestamp':1302642381,'job':'download http://example.com/'}
The next message that will be reserved will be the next available entry from the selected tubes, according to priority and time - subject to any delay that you had requested when you originally sent the message to the queue.
Addition: You can get the priority of a beanstalk job (as well as a number of other pieces of information, such as how many times it has previously been reserved), but it's an additional call - to the stats-job command. Called with the jobId, it returns about a dozen different pieces of information. See the protocol document, and your libraries docs.