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

["Chesnay Schepler (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-19490?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Chesnay Schepler closed FLINK-19490.
------------------------------------
    Resolution: Fixed

master: 8b05cbee4425c5ee33d73bed1473e075d7e17387

> 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
>            Assignee: Chesnay Schepler
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.13.0
>
>
> 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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