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POSpring Batch - JdbcCursorItemReader throwing OutOfMemoryError with large MySQL table
 

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  1. POSpring Batch - JdbcCursorItemReader throwing OutOfMemoryError with large MySQL table
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    <p>I am writing a program using Spring Batch to process 7,637,064 rows from a MySQL database table. I've had success with smaller tables, but the large number of rows in this table is causing OutOfMemoryError exceptions when the JdbcCursorItemReader attempts to open the cursor. </p> <p>I could probably resolve this by throwing a larger Xmx at it, but it seems to me that Spring Batch should have a way to handle this and that I may simply be missing a key piece of configuration. </p> <p>Spring Batch configuration:</p> <pre><code> &lt;job id="reportJob" xmlns="http://www.springframework.org/schema/batch"&gt; &lt;step id="largeTableTransfer"&gt; &lt;tasklet&gt; &lt;chunk reader="largeTableReader" processor="largeTableTransformer" writer="largeTableWriter" commit-interval="10" /&gt; &lt;/tasklet&gt; &lt;/step&gt; &lt;/job&gt; &lt;bean id="largeTableReader" class="org.springframework.batch.item.database.JdbcCursorItemReader"&gt; &lt;property name="dataSource" ref="inputDataSource" /&gt; &lt;property name="sql" value="select * from largeTable" /&gt; &lt;property name="rowMapper"&gt; &lt;bean class="myproject.reader.largeTableRowMapper" /&gt; &lt;/property&gt; &lt;/bean&gt; &lt;bean id="largeTableTransformer" class="myproject.transformer.LargeTableTransformer" /&gt; &lt;bean id="largeTableWriter" class="myproject.writer.JdbcLargeTableWriter"&gt; &lt;property name="dataSource" ref="outputDataSource" /&gt; &lt;/bean&gt; </code></pre> <p>Setting <em>fetchSize</em> on the JdbcCursorItemReader appears to have no effect. The only thing that allows it to run to completion is to set the <em>maxRows</em> to a small number, but then only that number of rows get processed. </p> <p>The relevant stack trace:</p> <pre><code>2012-11-21 11:25:29,931 DEBUG [org.springframework.batch.core.repository.dao.JdbcStepExecutionDao] - &lt;Truncating long message before update of StepExecution, original message is: java.lang.OutOfMemoryError: Java heap space at java.util.Arrays.copyOf(Arrays.java:2734) at java.util.ArrayList.ensureCapacity(ArrayList.java:167) at java.util.ArrayList.add(ArrayList.java:351) at com.mysql.jdbc.MysqlIO.readSingleRowSet(MysqlIO.java:2821) at com.mysql.jdbc.MysqlIO.getResultSet(MysqlIO.java:467) at com.mysql.jdbc.MysqlIO.readResultsForQueryOrUpdate(MysqlIO.java:2510) at com.mysql.jdbc.MysqlIO.readAllResults(MysqlIO.java:1746) at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2135) at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2542) at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1734) at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1885) at org.apache.commons.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:93) at org.springframework.batch.item.database.JdbcCursorItemReader.openCursor(JdbcCursorItemReader.java:125) at org.springframework.batch.item.database.AbstractCursorItemReader.doOpen(AbstractCursorItemReader.java:401) at org.springframework.batch.item.support.AbstractItemCountingItemStreamItemReader.open(AbstractItemCountingItemStreamItemReader.java:134) at org.springframework.batch.item.support.CompositeItemStream.open(CompositeItemStream.java:93) at org.springframework.batch.core.step.tasklet.TaskletStep.open(TaskletStep.java:301) at org.springframework.batch.core.step.AbstractStep.execute(AbstractStep.java:192) at org.springframework.batch.core.job.SimpleStepHandler.handleStep(SimpleStepHandler.java:135) at org.springframework.batch.core.job.flow.JobFlowExecutor.executeStep(JobFlowExecutor.java:61) at org.springframework.batch.core.job.flow.support.state.StepState.handle(StepState.java:60) at org.springframework.batch.core.job.flow.support.SimpleFlow.resume(SimpleFlow.java:144) at org.springframework.batch.core.job.flow.support.SimpleFlow.start(SimpleFlow.java:124) at org.springframework.batch.core.job.flow.FlowJob.doExecute(FlowJob.java:135) at org.springframework.batch.core.job.AbstractJob.execute(AbstractJob.java:293) at org.springframework.batch.core.launch.support.SimpleJobLauncher$1.run(SimpleJobLauncher.java:120) at org.springframework.core.task.SyncTaskExecutor.execute(SyncTaskExecutor.java:48) at org.springframework.batch.core.launch.support.SimpleJobLauncher.run(SimpleJobLauncher.java:114) at ifpress.ams2amx.ExampleJobConfigurationTests.testLaunchJob(ExampleJobConfigurationTests.java:32) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) </code></pre>
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