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From "Francesco Mari (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OAK-6901) Unknown channel option 'TCP_NODELAY' for channel warning in cold standby
Date Mon, 06 Nov 2017 09:46:01 GMT

    [ https://issues.apache.org/jira/browse/OAK-6901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16240077#comment-16240077
] 

Francesco Mari commented on OAK-6901:
-------------------------------------

{{TCP_NODELAY}} disables TCP's internal buffering for small packets. It makes sense for the
client channels and the worker channels on the server, since we make buffering at application's
level and don't need support from the protocol to optimize small writes. The option should
be removed from the parent channel in the server, it definitely doesn't make sense there.

Regarding the reason why we are seeing the warning now, it might be related to [issue 6192|https://github.com/netty/netty/issues/6192]
in Netty.

> Unknown channel option 'TCP_NODELAY' for channel warning in cold standby
> ------------------------------------------------------------------------
>
>                 Key: OAK-6901
>                 URL: https://issues.apache.org/jira/browse/OAK-6901
>             Project: Jackrabbit Oak
>          Issue Type: Bug
>          Components: segment-tar, tarmk-standby
>    Affects Versions: 1.7.6
>            Reporter: Andrei Dulceanu
>            Assignee: Andrei Dulceanu
>            Priority: Minor
>              Labels: cold-standby
>             Fix For: 1.7.12
>
>
> After the netty upgrade in OAK-6564, there's a recurring warning appearing in the server
thread:
> {noformat}
> 18:54:44.691 [main] WARN  io.netty.bootstrap.ServerBootstrap - Unknown channel option
'TCP_NODELAY' for channel '[id: 0xa64bc5c4]'
> {noformat}
> We need to see what's causing it (i.e. was that option removed in the latest version?
if yes, is there a substitute/change needed?).
> /cc [~frm]



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