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From: Mouradk <mouradk78@googlemail.com>
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Subject: Failure connecting to Hbase remotely from Tomcat 6 Servlet
Message-Id: <5FD7CD8C-032D-46DC-88CE-9CEDD3FE7159@gmail.com>
Date: Mon, 1 Oct 2012 14:54:18 +0100
To: user@hbase.apache.org
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Hello,

This is my first post so apologies if I am breaking some etiquette.

I am not an expert on Hbase and have been flaying through threads of =
Hbase remote connection but with no luck solving my problem.

I am running a Hbase/Hadoop single cluster on an EC2 instance (Ubuntu =
10.4). I am also running a servlet on a tomcat6 server in another ec2 =
instance. The plan is for the servlet to write and read to the remote =
Hbase instance. The servlet is running a context listener with some java =
routines (ServletContextListener).

Now if I run the java project as a runnable jar instead of a servlet all =
is fine. It connects to Hbase and writes/reads from table. But on =
tomcat6 it just freezes when attempting to connect to the Hbase =
instance.

2012-10-01 11:11:40,751 [Timer-4] INFO  =
com.myApp.foundation.access.HBaseHandler  initialise(..) - =
Initialisation HbaseHandler configuration ...
2012-10-01 11:11:40,763 [Timer-4] DEBUG =
org.apache.hadoop.conf.Configuration  <init>(..) - java.io.IOException: =
config()
    at =
org.apache.hadoop.conf.Configuration.<init>(Configuration.java:211)
    at =
org.apache.hadoop.conf.Configuration.<init>(Configuration.java:198)
    at =
org.apache.hadoop.hbase.HBaseConfiguration.<init>(HBaseConfiguration.java:=
33)
    at =
com.myApp.foundation.access.HBaseHandler.initialise(HBaseHandler.java:507)=

    at =
com.myApp.foundation.access.HBaseHandler.<init>(HBaseHandler.java:53)
    at =
com.myApp.foundation.access.HBaseHandler.getInstance(HBaseHandler.java:500=
)
    at =
com.myApp.foundation.hbase.StorableRow.<clinit>(StorableRow.java:40)
    at =
com.myApp.foundation.entities.Article.storeToHbase(Article.java:257)
    at =
com.myApp.task.impl.HBaseArticlePersisterTask.process(HBaseArticlePersiste=
rTask.java:101)
    at =
com.myApp.foundation.task.QueueTask.performTask(QueueTask.java:101)
    at =
com.myApp.runner.impl.HBasePersisterRunner$1.run(HBasePersisterRunner.java=
:46)
    at java.util.TimerThread.mainLoop(Timer.java:512)
    at java.util.TimerThread.run(Timer.java:462)

2012-10-01 11:11:40,803 [Timer-4] INFO  =
com.myApp.foundation.access.HBaseHandler  initialise(..) - Config =
resource zookeeper.quorum: ip-10-10-10-10.eu-west-1.compute.internal

2012-10-01 11:11:40,803 [Timer-4] INFO  =
com.myApp.foundation.access.HBaseHandler  initialise(..) - Config =
resource zookeeper.clientPort: 2181

2012-10-01 11:11:40,804 [Timer-4] INFO  =
com.myApp.foundation.access.HBaseHandler  initialise(..) - Config =
resource hbase.master.info.port: 60010

2012-10-01 11:11:40,804 [Timer-4] INFO  =
com.myApp.foundation.access.HBaseHandler  initialise(..) - Config =
resource hbase.master.info.bindAddress: =
ip-10-10-10-10.eu-west-1.compute.internal
I can telnet the HBase instance. In the servlet I included the =
hbase-site.xml. But as you can see from the log, the zookkeeper.quorum =
is getting picked up as well as the port number. All necessary ports are =
open on the Hbase instance.

Something is telling me tomcat6 policy configuration is to blame. But I =
don't see anything in the catalina logs. Are there any other logs I am =
missing or could guide me to the right logs? Anywhere I can track if =
Zookeeper is receiving any requests?

Has someone experienced the same problem?

Many thanks in advance.

Mourad=

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