Z0ltrix opened a new pull request #2406:
URL: https://github.com/apache/drill/pull/2406


   # [DRILL-8077](https://issues.apache.org/jira/browse/DRILL-8077): Thousand 
of CLOSE_WAIT connections to HDFS Datanode 
   
   ## Description
   
   When Drill runs in an IPv6 environment, it tries to reach the HDFS Datanode 
over IPv6, but the Datanode does not close the connection correctly. This leads 
to thousands of CLOSE_WAIT ipv6 connections from Drillbit to Datanode and after 
a while the Machine runs out of ports and stop working.
   
   To avoid this situation, we can prever IPv4 over IPv6 in drill-env.sh
   
   ## Documentation
   Code is self-explaining
   
   ## Testing
   local build was successful
   


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