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https://issues.apache.org/jira/browse/SPARK-704?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14039742#comment-14039742
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Mridul Muralidharan commented on SPARK-704:
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If remote node goes down, SendingConnection would be notified since it is also
registered for read events (to handle precisely this case actually).
ReceivingConnection would anyway be notified since it is waiting on reads on
that socket.
This, ofcourse, assumes that local node detects remote node failure at tcp
layer.
Problems come in when
> ConnectionManager sometimes cannot detect loss of sending connections
> ---------------------------------------------------------------------
>
> Key: SPARK-704
> URL: https://issues.apache.org/jira/browse/SPARK-704
> Project: Spark
> Issue Type: Bug
> Reporter: Charles Reiss
> Assignee: Henry Saputra
>
> ConnectionManager currently does not detect when SendingConnections
> disconnect except if it is trying to send through them. As a result, a node
> failure just after a connection is initiated but before any acknowledgement
> messages can be sent may result in a hang.
> ConnectionManager has code intended to detect this case by detecting the
> failure of a corresponding ReceivingConnection, but this code assumes that
> the remote host:port of the ReceivingConnection is the same as the
> ConnectionManagerId, which is almost never true. Additionally, there does not
> appear to be any reason to assume a corresponding ReceivingConnection will
> exist.
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