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Date: Sat, 23 Jun 2012 15:19:43 +0000 (UTC)
From: "nkeywal (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] [Commented] (HBASE-4671) HBaseTestingUtility unable to
 connect to regionserver because of 127.0.0.1 / 127.0.1.1 discrepancy
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    [ https://issues.apache.org/jira/browse/HBASE-4671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13399974#comment-13399974 ] 

nkeywal commented on HBASE-4671:
--------------------------------

>From the hbase reference guide: http://hbase.apache.org/book.html#os

{noformat}
2.2.3. Loopback IP

HBase expects the loopback IP address to be 127.0.0.1. Ubuntu and some other distributions, for example, will default to 127.0.1.1 and this will cause problems for you.

/etc/hosts should look something like this:

            127.0.0.1 localhost
            127.0.0.1 ubuntu.ubuntu-domain ubuntu
{noformat}

                
> HBaseTestingUtility unable to connect to regionserver because of 127.0.0.1 / 127.0.1.1 discrepancy
> --------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-4671
>                 URL: https://issues.apache.org/jira/browse/HBASE-4671
>             Project: HBase
>          Issue Type: Bug
>          Components: test
>    Affects Versions: 0.90.4
>         Environment: At least Ubuntu 11.10 with a default hosts file.
>            Reporter: Ferdy Galema
>
> When /etc/hosts contains following lines (and this is not uncommon) it will cause HBaseTestingUtility to malfunction.
> 127.0.0.1	localhost
> 127.0.1.1	myMachineName
> Symptoms:
> 2011-10-25 17:38:30,875 WARN  master.AssignmentManager - Failed assignment of -ROOT-,,0.70236052 to serverName=localhost,34462,1319557102914, load=(requests=0, regions=0, usedHeap=46, maxHeap=865), trying to assign elsewhere instead; retry=0
> org.apache.hadoop.hbase.client.RetriesExhaustedException: Failed setting up proxy interface org.apache.hadoop.hbase.ipc.HRegionInterface to /127.0.0.1:34462 after attempts=1
> because
> 2011-10-25 17:38:28,371 INFO  regionserver.HRegionServer - Serving as localhost,34462,1319557102914, RPC listening on /127.0.1.1:34462, sessionid=0x1333bbb7a180002
> caused by /127.0.0.1:34462 vs /127.0.1.1:34462
> Workaround:
> Changing 127.0.1.1 to 127.0.0.1 works.
> Permanent solution:
> Dunno, my understanding of inner workings is not sufficient enough. Although it seems like it has something to do with changing the machine name from myMachineName to localhost during the test:
> 2011-10-25 17:38:28,056 INFO  regionserver.HRegionServer - Master passed us address to use. Was=myMachineName:34462, Now=localhost:34462

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