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From "Fredrik Einarsson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GIRAPH-904) Giraph can hang when hostnames include uppercase letters
Date Mon, 02 Feb 2015 14:47:34 GMT

    [ https://issues.apache.org/jira/browse/GIRAPH-904?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14301343#comment-14301343
] 

Fredrik Einarsson commented on GIRAPH-904:
------------------------------------------

Hi,

This does not seem to be fully solved. Today I pulled down Giraph 1.1.0 via Maven and tried
to run some jobs. The Giraph job hanged indefinitely. After changing to only lowercase hostname
it is now working. The hadoop version is 0.20.203.0. I can reproduce the error if that interests
someone.



> Giraph can hang when hostnames include uppercase letters
> --------------------------------------------------------
>
>                 Key: GIRAPH-904
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-904
>             Project: Giraph
>          Issue Type: Bug
>          Components: bsp, conf and scripts, zookeeper
>    Affects Versions: 1.1.0
>            Reporter: Jaeho Shin
>            Assignee: Jaeho Shin
>             Fix For: 1.1.0
>
>         Attachments: GIRAPH-904.BspServiceMaster-fix.patch, GIRAPH-904.getHostname-fix.patch,
GIRAPH-904.patch
>
>
> We found that Giraph jobs were consistently hanging if uppercase letters were included
in the DNS (or /etc/hosts) resolved hostnames ({{foo.stanford.edu}} vs. {{foo.Stanford.EDU}}
from our DNS).  Normalizing the hostnames to lower case from {{GiraphConfiguration#getLocalHostname()}}
fixed our problem.



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