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From "Alessio Arleo (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GIRAPH-904) Giraph can hang when hostnames include uppercase letters
Date Tue, 10 Feb 2015 09:02:35 GMT

    [ https://issues.apache.org/jira/browse/GIRAPH-904?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14313853#comment-14313853
] 

Alessio Arleo commented on GIRAPH-904:
--------------------------------------

Hello,

I confirm that the issue is still there: I pulled and compiled yesterday Giraph 1.1.0 and
the computation hanged with the following error:

> barrierOnWorkerList: Missing chosen workers [Worker(hostname=virtualmint-h023,
> MRtaskID=1, port=30001)] on superstep -1
> 2015-02-09 20:55:13,590 ERROR org.apache.giraph.master.MasterThread:
> masterThread: Master algorithm failed with IllegalStateException
> java.lang.IllegalStateException: coordinateVertexInputSplits: Worker failed
> during input split (currently not supported)

In this log my hostname is written in only lowercase letters, while it was actually made up
by both uppercase and lowercase letters. Using a hostname with only lowercase letters managed
to solve the problem. I'd suggest the reporter to reopen the issue.

> 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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