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From "HBase Review Board (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2806) DNS hiccups cause uncaught NPE in HServerAddress#getBindAddress
Date Mon, 05 Jul 2010 17:50:51 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2806?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12885284#action_12885284
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HBase Review Board commented on HBASE-2806:
-------------------------------------------

Message from: stack@duboce.net

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This is an automatically generated e-mail. To reply, visit:
http://review.hbase.org/r/244/#review301
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Ship it!


- stack





> 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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