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From "Daryn Sharp (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8221) Hftp connections do not have a timeout
Date Fri, 30 Mar 2012 14:48:29 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13242395#comment-13242395
] 

Daryn Sharp commented on HADOOP-8221:
-------------------------------------

Yes, I should have commented that {{throwIOExceptionFromConnection}} is wrong.  Http error
codes do not generate an exception.  If an exception occurs during the connect, something
seriously went wrong.  Ie. connect error, could send request, SSL negotiation failed, etc.
 Thus the client is left in a blocking read waiting for a response that will never come. 
The methods like {{getInputStream}} read the response code and headers.

On a side note, it's also odd that the DN's jetty doesn't have a timeout while waiting for
a request.  Maybe it does, but when the DN is getting jammed the timeout isn't kicking in.
 To clarify for others, we are addressing three problems:
# Socket is left dangling because the remote host closed the socket.  Not sure why unless
there's a linux kernel bug (unlikely?) or the tcp FIN packets were somehow lost.
# DN accepts the connection, but never sends a response.
# DN host becomes a "zombie".  The host is inexplicably hung such that you can't even ssh
or console into the box.  Sockets connect into the listen backlog, but are never accepted
and processed.

I'll work on a patch for 1.x.
                
> Hftp connections do not have a timeout
> --------------------------------------
>
>                 Key: HADOOP-8221
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8221
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs
>    Affects Versions: 0.23.0, 0.24.0
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>            Priority: Critical
>         Attachments: HADOOP-8221.patch
>
>
> Hftp connections do not have read timeouts.  This leads to indefinitely hung sockets
when there is a network outage during which time the remote host closed the socket.
> This may also affect WebHdfs, etc.

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