This is mostly the same code with the listener:
from json import dumps
from random import randint
from stomp import (Connection,
ConnectionListener)
import time
# Listener that consumes messages and display the priority of the received
message.
class PriorityTestListener(ConnectionListener):
def __init__(self,
conn):
# Used to ACK messages once they are processed.
self.conn = conn
def on_message(self,
frame):
# Called by the STOMP connection when a MESSAGE frame is received.
# Parameters: frame (Frame) - the stomp frame
# message is a stomp.utils.Frame with:
# message.cmd == "MESSAGE"
# message.headers == dict()
# message.body == str
message_id = frame.headers["message-id"]
subscription = int(frame.headers["subscription"])
priority = int(frame.headers["priority"])
print("Received message with id",
message_id,
"and priority",
priority,
".")
# Simulate long-running process.
time.sleep(1)
conn.ack(message_id,
subscription)
conn = Connection([("localhost", 61613)])
listener = PriorityTestListener(conn)
conn.set_listener("",
listener)
conn.connect(wait=True)
# First, stuff a number of low-priority messages into the queue.
for _ in range(250):
priority = randint(1,5)
conn.send("/queue/Priority Test",
dumps({}),
"application/json",
headers={"persistent": "true",
"priority": priority})
# Now start working off the queue.
conn.subscribe("/queue/Priority Test",
42,
ack="client-individual",
headers={"activemq.prefetchSize": 1})
# Now stuff a few high-priority message onto the queue.
# We would like for them to be processed immediately.
time.sleep(20)
for _ in range(10):
priority = 9
print("Adding a high priority message to the queue . . .")
conn.send("/queue/Priority Test",
dumps({}),
"application/json",
headers={"persistent": "true",
"priority": 9})
time.sleep(randint(5,10))
# Keep the process alive until the connection terminates.
try:
while conn.is_connected():
time.sleep(30)
except:
# Ctrl-C throws an exception
pass
print("Process complete.")
for _ in range(25):
priority = randint(1,9)
conn.send("/queue/Priority Test",
dumps({}),
"application/json",
headers={"persistent": "true",
"priority": 9})
UPDATE:
The issue only shows up iff the consumer is processing a LOT of messages on the
queue and a higher priority message arrives -- it doesn't recognize and consume
that new higher priority message until it finished consuming a dozen or so
lower priority messages. It's as if it has cached the messages it "plans" to
consume and processes those before grabbing the highest priority messages off
of the queue.
Why is this an issue you may ask? Because I am using the queue to pass long
running tasks to a server that can only process one task at a time. There are
currently thousands of low-priority messages in the queue, some of which take
several minutes to complete, and I would like to have new high-priority
messages processed right away.
If you run the code above and only stuff, say, 50 or 100 low priority messages
on the queue before peppering it with high priority messages it works as
advertised. But with 250 or more in the queue there is a delay . . . here is
the output (notice the delay before it picks up the first several high-priority
messages):
/usr/bin/python3.6 /pub/dev/flotsam/run_priority_message_test.py
Received message with id ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:3
and priority 5 .
Received message with id ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:4
and priority 5 .
Received message with id ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:5
and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:11 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:12 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:14 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:15 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:25 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:26 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:31 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:33 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:35 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:36 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:38 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:40 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:45 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:47 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:48 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:49 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:50 and priority 5 .
Adding a high priority message to the queue . . .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:51 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:56 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:57 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:65 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:68 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:69 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:73 and priority 5 .
Adding a high priority message to the queue . . .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:74 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:89 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:94 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:110 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:118 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:124 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:125 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:128 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:151 and priority 5 .
Adding a high priority message to the queue . . .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:153 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:162 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:167 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:169 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:174 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:178 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:190 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:194 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:200 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:201 and priority 5 .
Adding a high priority message to the queue . . .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:203 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:205 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:206 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:216 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:228 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:251 and priority 9 .
Adding a high priority message to the queue . . .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:252 and priority 9 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:253 and priority 9 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:254 and priority 9 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:255 and priority 9 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:229 and priority 5 .
Adding a high priority message to the queue . . .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:256 and priority 9 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:233 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:236 and priority 5 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:241 and priority 5 .
Received message with id ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:2
and priority 4 .
Adding a high priority message to the queue . . .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:257 and priority 9 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:13 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:19 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:23 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:24 and priority 4 .
Adding a high priority message to the queue . . .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:258 and priority 9 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:28 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:64 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:66 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:75 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:76 and priority 4 .
Adding a high priority message to the queue . . .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:259 and priority 9 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:77 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:78 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:81 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:84 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:86 and priority 4 .
Adding a high priority message to the queue . . .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:260 and priority 9 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:88 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:91 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:93 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:95 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:97 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:99 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:104 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:108 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:114 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:121 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:131 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:142 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:145 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:146 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:147 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:157 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:160 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:163 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:164 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:173 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:176 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:177 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:186 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:187 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:193 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:209 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:212 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:214 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:215 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:219 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:220 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:225 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:232 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:246 and priority 4 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:249 and priority 4 .
Received message with id ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:1
and priority 3 .
Received message with id ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:6
and priority 3 .
Received message with id ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:8
and priority 3 .
Received message with id ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:9
and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:20 and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:41 and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:42 and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:43 and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:55 and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:59 and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:83 and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:87 and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:90 and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:92 and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:102 and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:106 and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:111 and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:117 and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:130 and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:135 and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:141 and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:152 and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:154 and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:155 and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:156 and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:158 and priority 3 .
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ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:159 and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:161 and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:184 and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:189 and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:195 and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:199 and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:208 and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:211 and priority 3 .
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ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:213 and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:217 and priority 3 .
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ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:218 and priority 3 .
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ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:224 and priority 3 .
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ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:226 and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:234 and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:235 and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:237 and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:239 and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:240 and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:244 and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:248 and priority 3 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:10 and priority 2 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:17 and priority 2 .
Received message with id
ID:Spark01.msic.ic.gov-36082-1654522010467-3:23:-1:1:22 and priority 2 .
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Process complete.
Process finished with exit code 0
________________________________
From: Justin Bertram <jbert...@apache.org>
Sent: Tuesday, June 7, 2022 4:46 PM
To: users@activemq.apache.org <users@activemq.apache.org>
Subject: [External] - Re: Stomp/Python Message Priority Seems To Be Ignored
CAUTION: This email originated from outside of the organization. Do not click
links or open attachments unless you recognize the sender and know the content
is safe.
Can you paste the consumer code as well? Is the consumer running while the
messages are being sent or do you send all the messages and then start the
consumer?
Justin
On Tue, Jun 7, 2022 at 12:11 PM Richard Bergmann
<rbergm...@colsa.com.invalid> wrote:
> Broker
> Name localhost
> Version 5.16.0
> ID ID:xxxxxxxxx-36082-1654522010467-0:1
> Uptime 1 day 3 hours
> Store percent used 0
> Memory percent used 0
> Temp percent used 0
>
> Out of necessity I have a single consumer of a queue (work needs to be
> completed serially), but I need to have some messages processed before
> others, i.e., in priority order.
>
> I have researched the documentation and my activmq.xml file contains:
>
> <broker
> xmlns="https://usg02.safelinks.protection.office365.us/?url=http%3A%2F%2Factivemq.apache.org%2Fschema%2Fcore&data=05%7C01%7CRBERGMANN%40colsa.com%7C531ad58d766e430b059d08da48c6dfe1%7C9821086b78824b43a5edb1e979bee31f%7C1%7C0%7C637902317189927363%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=YVX2so%2Fm9Vhr1f4N9Pt%2FRMRR1kX4ndNIZ8YwrdqTuDo%3D&reserved=0";
> brokerName="localhost"
> dataDirectory="${activemq.data}">
> <destinationPolicy>
> <policyMap>
> <policyEntries>
> <policyEntry queue=">" prioritizedMessages="true"
> useCache="false" expireMessagesPeriod="0" queuePrefetch="1"/>
> <policyEntry topic=">" >
> <!--
> The constantPendingMessageLimitStrategy is used to prevent
> slow topic consumers to block producers and affect other
> consumers
> by limiting the number of messages that are retained
> For more information, see:
> https://usg02.safelinks.protection.office365.us/?url=http%3A%2F%2Factivemq.apache.org%2Fslow-consumer-handling.html&data=05%7C01%7CRBERGMANN%40colsa.com%7C531ad58d766e430b059d08da48c6dfe1%7C9821086b78824b43a5edb1e979bee31f%7C1%7C0%7C637902317189927363%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=B80zy76K9Xzme23WUG55SX27hOI1WYLchrFMRFFFRZI%3D&reserved=0
> -->
> <pendingMessageLimitStrategy>
> <constantPendingMessageLimitStrategy limit="1000"/>
> </pendingMessageLimitStrategy>
> </policyEntry>
> </policyEntries>
> </policyMap>
> </destinationPolicy>
>
> If I run this Python code:
>
> from json import dumps
> from random import randint
> from stomp import Connection
>
>
> conn = Connection([("localhost", 61613)])
> conn.connect()
>
> for _ in range(25):
> priority = randint(1,9)
> conn.send("/queue/Priority Test",
> dumps({}),
> "application/json",
> headers={"persistent": "true",
> "priority": priority})
>
> The messages appear in the queue (and are therefore consumed from the
> queue) in the order they arrived, not priority order.
>
> Of course, if I manually sort the messages using the web interface (
> http://localhost:8161/admin/browse.jsp?JMSDestination=Queue+Name<
> http://localhost:8161/admin/browse.jsp?JMSDestination=Queue+Name+>) the
> messages will be consumed in the desired order, but this is not a workable
> solution.
>
> Am I missing somehing?
> ________________________________
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