[jira] [Created] (SPARK-27868) Better document shuffle / RPC listen backlog

["Marcelo Vanzin (JIRA)" <ji...@apache.org>]

Marcelo Vanzin created SPARK-27868:
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             Summary: Better document shuffle / RPC listen backlog
                 Key: SPARK-27868
                 URL: https://issues.apache.org/jira/browse/SPARK-27868
             Project: Spark
          Issue Type: Improvement
          Components: Documentation, Spark Core
    Affects Versions: 2.4.3
            Reporter: Marcelo Vanzin


The option to control the listen socket backlog for RPC and shuffle servers is not documented in our public docs.

The only piece of documentation is in a Java class, and even that documentation is incorrect:

{code}
  /** Requested maximum length of the queue of incoming connections. Default -1 for no backlog. */
  public int backLog() { return conf.getInt(SPARK_NETWORK_IO_BACKLOG_KEY, -1); }
{code}

The default value actual causes the default value from the JRE to be used, which is 50 according to the docs.



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