dsmlily commented on issue #155: The availablePermits of the topic is twice as 
much as the consumer.ReceiverQueueSize
URL: 
https://github.com/apache/pulsar-client-go/issues/155#issuecomment-570477341
 
 
   @cckellogg 
   1、just to confirm you still receive messages as normal but the number of 
available permits is about double the queue size? 
   Yes, I still receive messages as normal but the number of available permits 
is about double the queue size.
   2、Is that correct? 
   If you refer to the message, yes, the message is correct.
   3、Does the consumer ever stop receiving message?
   the consumer has been running
   
   today, I reproduce this, and find that the consumer reconnects broker every 
90 seconds in blusar's logs, and the time is same as the connectedSince:
   
   #####  1、broker's logs:
   ```
   13:41:34.976 [pulsar-io-22-1] INFO  
org.apache.pulsar.broker.service.ServerCnx - New connection from 
/10.32.68.228:44686
   13:42:35.081 [pulsar-io-22-3] INFO  
org.apache.pulsar.broker.service.ServerCnx - New connection from 
/10.32.68.228:44762
   13:43:35.184 [pulsar-io-22-5] INFO  
org.apache.pulsar.broker.service.ServerCnx - New connection from 
/10.32.68.228:44842
   13:45:05.299 [pulsar-io-22-7] INFO  
org.apache.pulsar.broker.service.ServerCnx - New connection from 
/10.32.68.228:44960
   
   ```
   
   #####  2、topics stats:
   ```
   {
     "msgRateIn" : 0.0,
     "msgThroughputIn" : 0.0,
     "msgRateOut" : 2.6263857425095147,
     "msgThroughputOut" : 2382.13186845613,
     "averageMsgSize" : 0.0,
     "storageSize" : 3173,
     "publishers" : [ {
       "msgRateIn" : 0.0,
       "msgThroughputIn" : 0.0,
       "averageMsgSize" : 0.0,
       "producerId" : 8,
       "metadata" : { },
       "producerName" : "qa-pulsar-ali-27-0",
       "connectedSince" : "2020-01-03T11:00:41.272+08:00",
       "address" : "/10.32.32.223:52486"
     } ],
     "subscriptions" : {
       "response:10.32.68.228:8787:28065:1578020423793" : {
         "msgRateOut" : 2.6263857425095147,
         "msgThroughputOut" : 2382.13186845613,
         "msgRateRedeliver" : 0.0,
         "msgBacklog" : 6,
         "blockedSubscriptionOnUnackedMsgs" : false,
         "msgDelayed" : 0,
         "unackedMessages" : 0,
         "type" : "Failover",
         "activeConsumerName" : "hgijd",
         "msgRateExpired" : 0.0,
         "consumers" : [ {
           "msgRateOut" : 2.6263857425095147,
           "msgThroughputOut" : 2382.13186845613,
           "msgRateRedeliver" : 0.0,
           "consumerName" : "hgijd",
           "availablePermits" : 1017,
           "unackedMessages" : 0,
           "blockedConsumerOnUnackedMsgs" : false,
           "metadata" : { },
           "connectedSince" : "2020-01-03T13:45:05.3+08:00",
           "address" : "/10.32.68.228:44960"
         } ],
         "isReplicated" : false
       }
     },
     "replication" : { },
     "deduplicationStatus" : "Disabled"
   }
   ```
   

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