[jira] [Created] (FLINK-19490) Document SOMAXCONN OS limit on blob server backlog

[Shang Yuanchun (Jira)]

Chesnay Schepler created FLINK-19490:
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             Summary: Document SOMAXCONN OS limit on blob server backlog
                 Key: FLINK-19490
                 URL: https://issues.apache.org/jira/browse/FLINK-19490
             Project: Flink
          Issue Type: Improvement
          Components: Documentation, Runtime / Coordination
            Reporter: Chesnay Schepler
             Fix For: 1.12.0


The {{BlobServer}} has a {{blob.fetch.backlog}} setting that controls how many connections can be queued when {{blob.fetch.num-concurrent}} is exceeded.
However, the backlog relies on OS functionality, which has it's own maximum limit (SOMAXCONN). Put another way, our backlog setting is just a hint to the OS.

This should be documented so that users who are thinking about this option are aware of it's limitations.



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