[jira] [Commented] (GIRAPH-904) Giraph can hang when hostnames include uppercase letters

["Fredrik Einarsson (JIRA)" <ji...@apache.org>]

    [ 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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