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Date: Mon, 5 Jul 2010 15:30:51 -0400 (EDT)
From: "Jonathan Gray (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Subject: [jira] Reopened: (HBASE-2806) DNS hiccups cause uncaught NPE in
 HServerAddress#getBindAddress
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     [ https://issues.apache.org/jira/browse/HBASE-2806?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonathan Gray reopened HBASE-2806:
----------------------------------


Trunk doesn't compile after this got committed

> DNS hiccups cause uncaught NPE in HServerAddress#getBindAddress
> ---------------------------------------------------------------
>
>                 Key: HBASE-2806
>                 URL: https://issues.apache.org/jira/browse/HBASE-2806
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Benoit Sigoure
>            Assignee: Benoit Sigoure
>            Priority: Minor
>             Fix For: 0.21.0
>
>         Attachments: 0001-HBASE-2806-Log-a-proper-error-message-and-don-t-NPE-.patch
>
>
> Yesterday at the Hadoop Summit, the "HADOOP" wireless network was using a pair of DNS servers that couldn't resolve {{localhost.}}.  This prevented me from starting HBase as the construction of the {{HMaster}} was failing with the following rather cryptic error:
> {code}
> 2010-06-29 14:30:24,603 ERROR org.apache.hadoop.hbase.master.HMaster: Failed to start master
> java.lang.RuntimeException: Failed construction of Master: class org.apache.hadoop.hbase.master.HMaster$LocalHMasternull
>         at org.apache.hadoop.hbase.master.HMaster.constructMaster(HMaster.java:1217)
>         at org.apache.hadoop.hbase.LocalHBaseCluster.<init>(LocalHBaseCluster.java:112)
>         at org.apache.hadoop.hbase.master.HMaster.doMain(HMaster.java:1298)
>         at org.apache.hadoop.hbase.master.HMaster.main(HMaster.java:1355)
> Caused by: java.lang.reflect.InvocationTargetException
>         at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
>         at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
>         at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
>         at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
>         at org.apache.hadoop.hbase.master.HMaster.constructMaster(HMaster.java:1215)
>         ... 3 more
> Caused by: java.lang.NullPointerException
>         at org.apache.hadoop.hbase.HServerAddress.getBindAddress(HServerAddress.java:89)
>         at org.apache.hadoop.hbase.master.HMaster.<init>(HMaster.java:204)
>         at org.apache.hadoop.hbase.master.HMaster$LocalHMaster.<init>(HMaster.java:1230)
>         ... 8 more
> {code}
> The {{NullPointerException}} in {{getBindAddress}} comes from the following line of code:
> {code:java}
>     return this.address.getAddress().getHostAddress();
> {code}
> where {{getAddress()}} was returning {{null}}.
> I think the code should check for this case, log an appropriate error message (to point whoever is going to troubleshoot the problem in the right direction), and throw something else than an NPE.

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