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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 Thu, 10 Dec 2009 23:54:18 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1222?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12789032#action_12789032

Hong Tang commented on MAPREDUCE-1222:

Ok, I did a bit research, and (with some help from Hairong) found out that the numeric ip
string is obtained by NN when a DN registers itself with NN through o.a.h.ipc.Server.getRemoteIAddress(),
which in turn calls InetAddress.getHostAddress() to get the string representation of the ip
address. For an Inet6Address, the format would always be 8 hexadecimal numbers (in the range
from 0 to ffff) separated by ":" (each number may be represented by 1 to 4 hexadecimal characters).

So for this jira, I'd like to just have a simple regex to recognize this format instead of
arbitrary ipv6 representations.

> [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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