HBase put fails at second insert - hadoop

Question

I'm using spring data + hbase to write some values into a HBase database.
Unfortunately the HbaseTemplate seems to close the connection after the first call.
I'm new to Spring and HBase/Hadoop, so i don't know if this is a Spring/HBase Configuration issue or another stupidity
Testclass:
package org.springframework.data.hadoop.samples;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.util.Bytes;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.data.hadoop.hbase.HbaseTemplate;
import org.springframework.data.hadoop.hbase.TableCallback;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
#RunWith(SpringJUnit4ClassRunner.class)
#ContextConfiguration("/hbase-context.xml")
public class WordCountWorkflowTest {
#Autowired
private ApplicationContext ctx;
#Autowired
private HbaseTemplate hbaseTemplate;
#Test
public void testWorkflowNS() throws Exception {
if (hbaseTemplate == null) {
throw new NullPointerException("template null!");
}
// Write to HBase
InnerTableCallback itc = new InnerTableCallback("JustaString", 42);
hbaseTemplate.execute("Wordcount", itc);
itc = new InnerTableCallback("Anotherstring", 23);
// Here the HBase insert fails
hbaseTemplate.execute("Wordcount", itc);
}
#Test
public void testWorkflowNSSucess() throws Exception {
System.out.println("done");
}
/**
* This is a Inner class providing access to the HBase Table to store the
* counted words and number of matches.
*
* */
class InnerTableCallback implements TableCallback<Object> {
String foundStr;
int no;
/**
* The constructor just saved the given foundStr/no tuple in inner
* variables.
*
* #param foundstr
* string found in the text
* #param no
* number of found matches
* #return null
* */
public InnerTableCallback(String foundStr, int no) {
this.foundStr = foundStr;
this.no = no;
}
/**
* This Method puts the given String and number of found matches into
* the HBase table the column family is "cf1" and the column is
* "matches". The rowname is the found string.
* */
#Override
public Object doInTable(HTable table) throws Throwable {
Put p = new Put(Bytes.toBytes(foundStr));
// Put operation on hbase shell:
// hbase(main):005:0> put 'testtable', 'myrow-2', 'colfam1:q2',
// 'value-2'
// add(byte[] family, byte[] qualifier, byte[] value)
p.add(Bytes.toBytes("cf1"), Bytes.toBytes("matches"),
Bytes.toBytes(new Integer(no).toString()));
table.put(p);
return null;
}
}
}
hbase-context.xml:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:hdp="http://www.springframework.org/schema/hadoop"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/hadoop http://www.springframework.org/schema/hadoop/spring-hadoop.xsd">
<context:property-placeholder location="classpath:batch.properties,classpath:hadoop.properties"
ignore-resource-not-found="true" ignore-unresolvable="true" />
<context:component-scan base-package="org.springframework.data.hadoop.samples" />
<bean class="org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor"/>
<bean id="hbaseTemplate" class="org.springframework.data.hadoop.hbase.HbaseTemplate" p:configuration-ref="hbaseConfiguration"/>
<hdp:hbase-configuration>
</hdp:hbase-configuration>
</beans>
Stacktrace:
org.springframework.data.hadoop.hbase.HbaseSystemException: org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation#61bb0cc0 closed; nested exception is java.io.IOException: org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation#61bb0cc0 closed
at org.springframework.data.hadoop.hbase.HbaseUtils.convertHbaseException(HbaseUtils.java:42)
at org.springframework.data.hadoop.hbase.HbaseTemplate.convertHbaseAccessException(HbaseTemplate.java:111)
at org.springframework.data.hadoop.hbase.HbaseTemplate.execute(HbaseTemplate.java:82)
at org.springframework.data.hadoop.samples.WordCountWorkflowTest.testWorkflowNS(WordCountWorkflowTest.java:35)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
....
Caused by: java.io.IOException: org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation#61bb0cc0 closed
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:822)
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:810)
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.processBatchCallback(HConnectionManager.java:1492)
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.processBatch(HConnectionManager.java:1377)
at org.apache.hadoop.hbase.client.HTable.flushCommits(HTable.java:916)
at org.apache.hadoop.hbase.client.HTable.doPut(HTable.java:772)
at org.apache.hadoop.hbase.client.HTable.put(HTable.java:747)
at org.springframework.data.hadoop.samples.WordCountWorkflowTest$InnerTableCallback.doInTable(WordCountWorkflowTest.java:83)
at org.springframework.data.hadoop.hbase.HbaseTemplate.execute(HbaseTemplate.java:72)
Cheers,R

Answer 1

Solved!
I've used a older and deprecated version of the spring-data-hadoop package (Milestone) in my maven pom.xml. I switched to the Snapshot repository, which fixes the incorrect handling of HBase tables.
If you use spring-batch: I had to change the <tasklet> definitions for hadoop to <job-tasklet> in the *context.xml with the new version.
The error message from the XML parser was:
The matching wildcard is strict, but no declaration can be found for element 'tasklet'
Hope this helps someone :-)