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Posted to users@activemq.apache.org by t-watana <wa...@jp.fujitsu.com> on 2018/06/15 09:51:52 UTC
the useless commands are written into KahaDB when the durable
subscriber is destroyed by "offline timeout"
Hi all, I use ActiveMQ 5.13.1 for MQTT.
It seems that ActivMQ writes some useless commands, when the durable
subscriber
is destroyed by Offline Timeout.
For example, the following situation:
- Topic a, b, c
- Durable Subscriber A, B, C
- "Durable Subscriber A" subscribe ONLY "Topic a"
- "Durable Subscriber B" subscribe ONLY "Topic b"
- "Durable Subscriber C" subscribe ONLY "Topic c"
When "Durable Subscriber A" is destroyed by Offline Timeout, ActiveMQ writes
the following three KAHA_SUBSCRIPTION_COMMANDs.
-KAHA_SUBSCRIPTION_COMMAND - TOPIC (DestId: 1:a), SubKey: A:EXACTLY_ONCE:A.
-KAHA_SUBSCRIPTION_COMMAND - TOPIC (DestId: 1:b), SubKey: A:EXACTLY_ONCE:A.
-KAHA_SUBSCRIPTION_COMMAND - TOPIC (DestId: 1:c), SubKey: A:EXACTLY_ONCE:A.
I think, the first command is necessary but the others are not
Don't you think that it should be checked and written whether the "durable
subscriber" is actually subscribing the topic ?
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