xCASx opened a new pull request #27230: [SPARK-27868][CORE] Partially rollback 
previous change #09ed64d.
URL: https://github.com/apache/spark/pull/27230
   The default value for backLog set back to -1, as any other value may break 
existing configuration by overriding Netty's default 
io.netty.util.NetUtil#SOMAXCONN. The documentation accordingly adjusted.
   See discussion thread: https://github.com/apache/spark/pull/24732
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   ### What changes were proposed in this pull request?
   Partial rollback of https://github.com/apache/spark/pull/24732 (default for 
backLog set back to -1).
   Please clarify what changes you are proposing. The purpose of this section 
is to outline the changes and how this PR fixes the issue. 
   If possible, please consider writing useful notes for better and faster 
reviews in your PR. See the examples below.
     1. If you refactor some codes with changing classes, showing the class 
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   ### Why are the changes needed?
   Previous change introduces backward incompatibility by overriding default of 
Netty's `io.netty.util.NetUtil#SOMAXCONN`
   Please clarify why the changes are needed. For instance,
     1. If you propose a new API, clarify the use case for a new API.
     2. If you fix a bug, you can clarify why it is a bug.

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