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https://issues.apache.org/jira/browse/APLO-370?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15432437#comment-15432437
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hebing edited comment on APLO-370 at 8/24/16 3:48 AM:
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i try to solved it by recomplie the mqtt.jar but failed。the reason is that when
you reconnect it with cleanSession = false，
service will not release last connect ，there will be two（maybe more）Session
(more info see Sink.scala) for same address,
when current working session is wrong,it will lose message, a simple way to
solved it by create new SessionState for every connect:
modified the MqttSession.java in attach method，change it to ：
...
if (false && !clean_session) {
// Setup the previous subscriptions..
session_state.strategy.create(host().store(), client_id);
....
hope it work for you and someone can fixed it.
was (Author: hebing):
i try to solved it by recomplie the mqtt.jar but failed。the reason is that when
you reconnect it with cleanSession = false，
service will not release last connect ，there will be two（maybe more）Session
(more info see Sink.scala) for same address,
when current working session is wrong,it will lose message, a simple way to
solved it by create new SessionState for every connect:
modified the MqttSessionManager.java in attach method，change it to ：
SessionState state;
//always create a
SessionState for incomming connect，if you want to remain data from cache ，copy
it
if (true || handler.connect_message.cleanSession())
{
state =
host_state.session_states.remove(client_id);
if (state == null) {
state = new SessionState();
}
} else {
state =
host_state.session_states.get(client_id);
if (state == null) {
state = new SessionState();
host_state.session_states.put(client_id,
state);
}
}
hope it work for you and someone can fixed it.
> Durable subscriptions can not work sometimes
> --------------------------------------------
>
> Key: APLO-370
> URL: https://issues.apache.org/jira/browse/APLO-370
> Project: ActiveMQ Apollo
> Issue Type: Bug
> Components: apollo-mqtt
> Affects Versions: 1.7
> Environment: centos 6.5
> Reporter: wanged
>
> I use durable subscriptions for mqtt. when the client connected and
> subscripted, sometimes receive message from dsub, sometimes not receive
> message(at this time dsub has messages, unless the client disconnect and
> reconnect) .
> my config is:
> <broker xmlns="http://activemq.apache.org/schema/activemq/apollo";
> validation="strict">
> <log_category console="console" security="security" connection="connection"
> audit="audit"/>
> <authentication domain="apollo"/>
> <access_rule allow="admins" action="*"/>
> <access_rule allow="*" action="connect" kind="connector"/>
> <auto_gc interval="60" />
> <virtual_host id="yey">
> <host_name>localhost</host_name>
> <host_name>127.0.0.1</host_name>
> <access_rule allow="apps" action="connect create receive consume"/>
> <access_rule allow="mgts" action="connect create send receive consume"/>
> <dsub tail_buffer="10k" full_policy="drop head" auto_delete_after="0"
> quota="102400"/>
> <leveldb_store directory="/data/apollo/data"/>
> </virtual_host>
> <web_admin bind="http://localhost:61680"/>
> <connector id="tcp" bind="tcp://0.0.0.0:1883" protocol="mqtt">
> <mqtt max_message_length ="10240" />
> </connector>
> <key_storage file="${apollo.base}/etc/keystore" password="password"
> key_password="password"/>
> </broker>
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