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From "Benoit Sigoure (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-2806) DNS hiccups cause uncaught NPE in HServerAddress#getBindAddress
Date Wed, 30 Jun 2010 18:42:49 GMT
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


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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