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From "sam rash (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6679) add retry logic to NetUtils.createSocketAddr() when hostname resolution fails
Date Tue, 06 Apr 2010 18:19:33 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6679?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12854102#action_12854102
] 

sam rash commented on HADOOP-6679:
----------------------------------

1. ah yes, I see the --no-prefix option.  I'll update and post the patch

2. my understanding is the jvm caches on successful resolution, not on failure, so a retry
should be useful
http://java.sun.com/javase/6/docs/technotes/guides/net/properties.html#nct
Do I misunderstand the docs?

3. you mean you want a port/service description passed in here?  

  public static InetSocketAddress createWithResolveRetry(
    String hostname,
    int port,
   String portDescription
  ) {
....

and I assume the NetUtils.createSocketAddr() would now have to take this?  It's current signature
is

  public static InetSocketAddress createSocketAddr(String target,
                                                   int defaultPort) {

can you clarify what you mean by this?




> 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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