[jira] Commented: (HADOOP-6679) add retry logic to NetUtils.createSocketAddr() when hostname resolution fails

["Steve Loughran (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-6679?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12853925#action_12853925 ] 

Steve Loughran commented on HADOOP-6679:
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# This is a git patch, not something hudson will handle, try --no-prefix, I think.

# What JVM options are you running to disable DNS caching, both successful and unsuccessful. Without that, retry in code may not be useful.

# If we are changing how ports are opened, I'd quite like to see a string parameter saying what the port is to be used for, perhaps with some logging. Sometimes it can be tricky trying to find out why some apparenlty random port is open, and if it was all logged (at -debug, with a stack trace), some things may be easier to deal with. 

> add retry logic to NetUtils.createSocketAddr() when hostname resolution fails
> -----------------------------------------------------------------------------
>
>                 Key: HADOOP-6679
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6679
>             Project: Hadoop Common
>          Issue Type: Improvement
>    Affects Versions: 0.20.0
>            Reporter: sam rash
>            Priority: Minor
>         Attachments: HADOOP-6679-patch-1.txt
>
>
> transient DNS errors can cause the InetSocketAddress created in NetUtils.createSocketAddr() to be unresolved when the hostname is resolvable.  Add a single retry after a short sleep using a simple InetSocketAddressFactory class

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