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https://issues.apache.org/jira/browse/HADOOP-4659?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12648754#action_12648754
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Raghu Angadi commented on HADOOP-4659:
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> [...] second call will end up seeing a closed connection and ConnectException 
> gets delivered to call in call.error. [...]

>From the code it does not seem to be the case (addCall() in getConnection() 
>will be false). I might be mistaken...

But if what you say is correct, then it is a bug that new call tries to use a 
closed connection rather than creating a new one as it should. 



> Root cause of connection failure is being lost to code that uses it for 
> delaying startup
> ----------------------------------------------------------------------------------------
>
>                 Key: HADOOP-4659
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4659
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: ipc
>    Affects Versions: 0.18.3
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Blocker
>             Fix For: 0.18.3
>
>         Attachments: connectRetry.patch, hadoop-4659.patch
>
>
> ipc.Client the root cause of a connection failure is being lost as the 
> exception is wrapped, hence the outside code, the one that looks for that 
> root cause, isn't working as expected. The results is you can't bring up a 
> task tracker before job tracker, and probably the same for a datanode before 
> a  namenode. The change that triggered this is not yet located, I had thought 
> it was HADOOP-3844 but I no longer believe this is the case.

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