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From "Hong Tang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1222) [Mumak] We should not include nodes with numeric ips in cluster topology.
Date Tue, 01 Dec 2009 00:46:21 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1222?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12783971#action_12783971
] 

Hong Tang commented on MAPREDUCE-1222:
--------------------------------------

@dick, thanks for the comments. I am combing through the jdk code too and struggling to find
the any explicit API. Finally, I found out that there are calls to directly translate ipv4/6
addresses from string literal form ot Inet{4|6}Address objects, but they are not in JDK, instead
they are in sun.net.util.IPAddressUtil - which makes it unusable (unless we mandate everybody
use sun jvm).

What bothers me for re-implementing RFC 2372 (IPv6 address architecture) is that it is a complicated
scheme and we probably need a suite of unit-tests to guarantee our implementation is correct
- which sounds to me to be way beyond the scope of this jira (which should not even exist
if HDFS-778 is fixed).



> [Mumak] We should not include nodes with numeric ips in cluster topology.
> -------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-1222
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1222
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: contrib/mumak
>    Affects Versions: 0.21.0, 0.22.0
>            Reporter: Hong Tang
>            Assignee: Hong Tang
>             Fix For: 0.21.0, 0.22.0
>
>         Attachments: IPv6-predicate.patch, mapreduce-1222-20091119.patch, mapreduce-1222-20091121.patch
>
>
> Rumen infers cluster topology by parsing input split locations from job history logs.
Due to HDFS-778, a cluster node may appear both as a numeric ip or as a host name in job history
logs. We should exclude nodes appeared as numeric ips in cluster toplogy when we run mumak
until a solution is found so that numeric ips would never appear in input split locations.

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