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package org.apache.giraph.examples; |
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import java.io.IOException; |
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import java.util.Map.Entry; |
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import org.apache.giraph.aggregators.AggregatorWriter; |
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import org.apache.giraph.conf.DefaultImmutableClassesGiraphConfigurable; |
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import org.apache.hadoop.fs.FSDataOutputStream; |
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import org.apache.hadoop.fs.FileSystem; |
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import org.apache.hadoop.fs.Path; |
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import org.apache.hadoop.io.Writable; |
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import org.apache.hadoop.mapreduce.Mapper.Context; |
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37 | 0 | public class SimpleAggregatorWriter extends |
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DefaultImmutableClassesGiraphConfigurable implements |
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AggregatorWriter { |
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private static String FILENAME; |
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private FSDataOutputStream output; |
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public static String getFilename() { |
46 | 0 | return FILENAME; |
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} |
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@SuppressWarnings("rawtypes") |
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@Override |
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public void initialize(Context context, long applicationAttempt) |
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throws IOException { |
53 | 0 | setFilename(applicationAttempt); |
54 | 0 | Path p = new Path(FILENAME); |
55 | 0 | FileSystem fs = FileSystem.get(context.getConfiguration()); |
56 | 0 | output = fs.create(p, true); |
57 | 0 | } |
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private static void setFilename(long applicationAttempt) { |
65 | 0 | FILENAME = "aggregatedValues_" + applicationAttempt; |
66 | 0 | } |
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@Override |
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public void writeAggregator( |
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Iterable<Entry<String, Writable>> aggregatorMap, |
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long superstep) throws IOException { |
72 | 0 | for (Entry<String, Writable> entry : aggregatorMap) { |
73 | 0 | entry.getValue().write(output); |
74 | 0 | } |
75 | 0 | output.flush(); |
76 | 0 | } |
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@Override |
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public void close() throws IOException { |
80 | 0 | output.close(); |
81 | 0 | } |
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} |