[GitHub] [pulsar] alexku7 commented on issue #7941: Consumer can't get messages with earliest position subscription type under some circumstances

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alexku7 commented on issue #7941:
URL: https://github.com/apache/pulsar/issues/7941#issuecomment-683969477


   Hello
   I am pretty sure that i succeeded to reproduce the conditions for this issue.
   
   
   1. create a topic with three partitions. my-tenant/my-namespace/my/topic
   2. The topic should have producers for producing relatively many messages ( let's say 3000 per second) with different keys
   2. create simultaneously **2**  consumers with key_shared subscription and earliest position:
   
   bin/pulsar-client consume -p Earliest -n 0 -s alex_test -t Key_Shared persistent://my-tenant/my-namespace/my/topic
   
   3, after 1-2 minutes , create third consumer with the same settings.
   
   You should see after 10-40 seconds that the all partitions are stuck with zero rate out and the backlog continues to grow .
   
   Interesting, that if i remove the third consumer, all are starting working again but if i remove the first or second consumer it's  still stuck.
   
   The issue doesn't occur with Latest position.
   
   


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