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POCassandra hector loader app runs out of memory
 

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    <p>This simple app takes a comma delim file with headers and puts into Cassandra. It works for small file, however the memory just goes up until out of memory exception kills it. </p> <p>What am I missing?</p> <pre><code>package com.company; import java.io.BufferedReader; import java.io.File; import java.io.FileNotFoundException; import java.io.FileReader; import java.io.IOException; import me.prettyprint.cassandra.serializers.StringSerializer; import me.prettyprint.hector.api.Cluster; import me.prettyprint.hector.api.Keyspace; import me.prettyprint.hector.api.beans.HColumn; import me.prettyprint.hector.api.factory.HFactory; import me.prettyprint.hector.api.mutation.Mutator; public class QuickLoad { public static Keyspace keyspace = null; public static void main(String[] args) { File file = new File(args[0]); String keyspaceName = args[1]; String columnFamilyName = args[2]; BufferedReader reader = null; try { keyspace = GetKeyspace(keyspaceName); reader = new BufferedReader(new FileReader(file)); String fileLine = null; String[] headers = null; String[] fields = null; boolean headerLine = true; while ((fileLine = reader.readLine()) != null) { if (headerLine){ headerLine = false; headers = fileLine.substring(1, fileLine.length()-1).split("\",\""); } else { fields = fileLine.substring(1, fileLine.length()-1).split("\",\""); CassandraSave(keyspace, columnFamilyName, headers, fields); } } } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { try { if (reader != null) { reader.close(); } } catch (IOException e) { e.printStackTrace(); } } System.exit(0); } public static void CassandraSave(Keyspace keyspace, String columnFamily, String[] headers, String[] columns) { try { Mutator mutator = HFactory.createMutator(keyspace, StringSerializer.get()); for (int i = 1; i &lt; headers.length-1; i++) { if ((columns[i] != null) || (!columns[i].equals("null"))) { if (columns[i].length() &gt; 0) { HColumn&lt;String, String&gt; col = HFactory.createStringColumn(headers[i], columns[i]); mutator.insert(columns[1], columnFamily, col); } } } mutator.execute(); } catch (Exception e){ e.printStackTrace(); } } public static Keyspace GetKeyspace(String keyspaceName) { String serverAddress = "localhost:9160"; Cluster cluster = HFactory.getOrCreateCluster("My Cluster", serverAddress); Keyspace keyspace = HFactory.createKeyspace(keyspaceName, cluster); return keyspace; } } </code></pre>
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    1. COCan you add this java parameter to your code -XX:+HeapDumpOnOutOfMemoryError then open the heap dump with visualvm http://download.oracle.com/javase/6/docs/technotes/guides/visualvm/heapdump.html and tell us what is taking up all the memory
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    2. COI used and Eclipse Addin MAT because visualvm gave me fits
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    3. COOne instance of "com.ecyrd.speed4j.log.PeriodicalLog" loaded by "sun.misc.Launcher$AppClassLoader @ 0x899902f8" occupies 127,293,432 (99.62%) bytes. Keywords com.ecyrd.speed4j.log.PeriodicalLog sun.misc.Launcher$AppClassLoader @ 0x899902f8
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