Spring Batch Partitioning - partition step not executing - spring-batch

Question

I am using Batch Partitioning to fetch and process records based on some range in one of the columns from the DB table. The partition step stagingPartitionStep appears after few steps in the job configuration as follows:
<batch:job id="myBatchJob">
<batch:step id="mainStep">
<batch:tasklet task-executor="myTaskExecutor" transaction-manager="batchTransactionManager">
<batch:chunk reader="myDataReader"
processor="MyDataProcessor" writer="MyDataWriter" commit-interval="50">
</batch:chunk>
<batch:listeners>
<batch:listener ref="myItemListener" />
</batch:listeners>
</batch:tasklet>
<batch:next on="COMPLETED" to="checkConditionStep" />
</batch:step>
<batch:step id="checkConditionStep">
<batch:tasklet task-executor="checkConditionExecutor"
transaction-manager="batchTransactionManager" ref="checkConditionTasklet">
</batch:tasklet>
<batch:next on="FAILED" to="updateStagingTableStep" />
<batch:next on="COMPLETED" to="stagingPartitionStep" />
</batch:step>
<batch:step id="updateStagingTableStep">
<batch:tasklet task-executor="checkConditionExecutor"
transaction-manager="batchTransactionManager" ref="updateStagingTasklet">
</batch:tasklet>
</batch:step>
<batch:step id="stagingPartitionStep">
<batch:partition step="processStagingStep" partitioner="stagingProcessPartitioner">
<batch:handler grid-size="10" task-executor="stagingProcessTaskExecutor" />
</batch:partition>
</batch:step>
<batch:job>
The partitioner and the partion step:
<bean id="stagingProcessPartitioner"
class="com.mycom.batch.partitioner.StagingProcessPartitioner"
scope="step">
</bean>
<batch:step id="processStagingStep">
<batch:tasklet transaction-manager="batchTransactionManager">
<batch:chunk reader="stagingProcessorDataReader" writer="stagingProcessorDataWriter"
commit-interval="50">
</batch:chunk>
</batch:tasklet>
</batch:step>
The task executors:
<bean id="myTaskExecutor"
class="org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor">
<property name="corePoolSize" value="20" />
<property name="maxPoolSize" value="20" />
</bean>
<bean id="stagingProcessTaskExecutor"
class="org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor">
<property name="corePoolSize" value="10" />
<property name="maxPoolSize" value="10" />
<property name="allowCoreThreadTimeOut" value="true" />
</bean>
<bean id="checkConditionStep"
class="org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor">
<property name="corePoolSize" value="1" />
<property name="maxPoolSize" value="1" />
</bean>
The partitioner implementation: The partitioner creates ExecutionContext for each partioned step and puts a prefix value which will be used in the JDBC query to create a partion based on voucher number.
public class StagingProcessPartitioner implements Partitioner{
public Map<String, ExecutionContext> partition(int gridSize) {
Map<String, ExecutionContext> partitionMap = new HashMap<String, ExecutionContext>();
for(int threadId = 0; threadId < gridSize; threadId++){
ExecutionContext context = new ExecutionContext();
String stepName = "step" + threadId;
context.put("voucherSuffix", threadId);
partitionMap.put(stepName, context);
LOGGER.info("Created ExecutionContext for partioned step : " + stepName);
}
return partitionMap;
}}
The data reader: The voucherSuffix from the step context is used in JDBC query to create data partion. Therefore 10 partions should be created on voucher numbers ending 0,1,2....,9.
<bean id="stagingProcessorDataReader"
class="org.springframework.batch.item.database.JdbcPagingItemReader"
scope="step">
<property name="dataSource" ref="dataSource" />
<property name="queryProvider" ref="stagingDataQueryProvider" />
<property name="parameterValues">
<map>
<entry key="department" value="#{jobParameters[department]}" />
<entry key="joiningDate" value="#{jobParameters[joiningDate]}" />
<entry key="voucherSuffix" value="#{stepExecutionContext[voucherSuffix]}" />
</map>
</property>
<property name="pageSize" value="1000" />
<property name="rowMapper" ref="myDataRowMapper"/>
</bean>
<bean id="stagingDataQueryProvider"
class="org.springframework.batch.item.database.support.SqlPagingQueryProviderFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="selectClause" value="SELECT EMP_ID, EMP_NAME, DOB, ADDRESS1, ADDRESS2" />
<property name="fromClause" value="EMP_STG_TBL" />
<property name="whereClause" value="WHERE DEPT_ID=:department AND DOJ=:joiningDate AND VCHR LIKE '%:voucherSuffix'" />
<property name="sortKeys">
<map>
<entry key="EMP_ID" value="ASCENDING"></entry>
</map>
</property>
</bean>
The problem is, when the job is executted, each step is executed fine till the partion step. The partioner creates the execution context which can be confirmed from the log statements but the step processStagingStep is not executed and the job finishes with status COMPLETED. Is this job and partion step configuration correct?
Here are the log statements
2015-02-23 03:03:04 INFO myTaskScheduler-3 SimpleStepHandler:146 - Executing step: [checkConditionStep]
2015-02-23 03:03:04 INFO myTaskScheduler-3 SimpleStepHandler:146 - Executing step: [stagingPartitionStep]
2015-02-23 03:03:04 INFO myTaskScheduler-3 StagingProcessPartitioner:29 - Created ExecutionContext for partioned step : step0
2015-02-23 03:03:04 INFO myTaskScheduler-3 StagingProcessPartitioner:29 - Created ExecutionContext for partioned step : step1
2015-02-23 03:03:04 INFO myTaskScheduler-3 StagingProcessPartitioner:29 - Created ExecutionContext for partioned step : step2
2015-02-23 03:03:04 INFO myTaskScheduler-3 StagingProcessPartitioner:29 - Created ExecutionContext for partioned step : step3
2015-02-23 03:03:04 INFO myTaskScheduler-3 StagingProcessPartitioner:29 - Created ExecutionContext for partioned step : step4
2015-02-23 03:03:04 INFO myTaskScheduler-3 StagingProcessPartitioner:29 - Created ExecutionContext for partioned step : step5
2015-02-23 03:03:04 INFO myTaskScheduler-3 StagingProcessPartitioner:29 - Created ExecutionContext for partioned step : step6
2015-02-23 03:03:04 INFO myTaskScheduler-3 StagingProcessPartitioner:29 - Created ExecutionContext for partioned step : step7
2015-02-23 03:03:04 INFO myTaskScheduler-3 StagingProcessPartitioner:29 - Created ExecutionContext for partioned step : step8
2015-02-23 03:03:04 INFO myTaskScheduler-3 StagingProcessPartitioner:29 - Created ExecutionContext for partioned step : step9
2015-02-23 03:03:05 INFO myTaskScheduler-3 SimpleJobLauncher:136 - Job: [FlowJob: [name=myBatchJob]] completed with the following parameters: [] and the following status: [COMPLETED]