Package org.apache.hadoop.hdfs

Source Code of org.apache.hadoop.hdfs.TestDFSClientMetricsSync

package org.apache.hadoop.hdfs;

import java.lang.reflect.Method;

import junit.framework.TestCase;

import org.apache.hadoop.hdfs.metrics.DFSClientMetrics;

public class TestDFSClientMetricsSync extends TestCase {

  private static final int THREAD_COUNT = 20;
  private static final int OPERATIONS_PER_THREAD = 100;
  private static final long PREAD_SIZE_VALUE = 3;
  private static final long PREAD_TIME_VALUE = 5;
  private static final long READ_TIME_VALUE = 7;
  private static final long SYNC_TIME_VALUE = 11;
  private static final long WRITE_SIZE_VALUE = 13;
  private static final long READ_SIZE_VALUE = 17;

  public void testSync() throws Exception{
    Thread[] threads = new Thread[THREAD_COUNT];
    final DFSClientMetrics metrics = new DFSClientMetrics();
    for(int i = 0; i < threads.length; i++) {
      threads[i] = new Thread(new Runnable() {

        @Override
        public void run() {
          for(int i = 0; i < OPERATIONS_PER_THREAD; i++) {
            metrics.incLsCalls();
            metrics.incNumCreateDirOps();
            metrics.incNumCreateFileOps();
            metrics.incPreadOps();
            metrics.incPreadSize(PREAD_SIZE_VALUE);
            metrics.incPreadTime(PREAD_TIME_VALUE);
            metrics.incReadOps();
            metrics.incReadsFromLocalFile();
            metrics.incReadSize(READ_SIZE_VALUE);
            metrics.incReadTime(READ_TIME_VALUE);
            metrics.incSyncTime(SYNC_TIME_VALUE);
            metrics.incWriteOps();
            metrics.incWriteSize(WRITE_SIZE_VALUE);
          }
        }
      });
    }
    for(int i = 0; i < threads.length; i++) {
      threads[i].start();
    }
    for(int i = 0; i < threads.length; i++) {
      threads[i].join();
    }

    // This is dependent to DFSClientMetrics private API; used to obtain value
    // of lsCalls.
    Method privateStringMethod = DFSClientMetrics.class
        .getDeclaredMethod("getAndResetLsCalls");
    privateStringMethod.setAccessible(true);

    long returnValue = (Long) privateStringMethod.invoke(metrics);
    assertEquals(THREAD_COUNT * OPERATIONS_PER_THREAD, returnValue);
   
    assertEquals(THREAD_COUNT * OPERATIONS_PER_THREAD,
        metrics.numCreateDirOps.getCurrentIntervalValue());
    assertEquals(THREAD_COUNT * OPERATIONS_PER_THREAD,
        metrics.numCreateFileOps.getCurrentIntervalValue());
    assertEquals(THREAD_COUNT * OPERATIONS_PER_THREAD,
        metrics.preadOps.getCurrentIntervalValue());
    assertEquals(THREAD_COUNT * OPERATIONS_PER_THREAD * PREAD_SIZE_VALUE,
        metrics.preadSize.getCurrentIntervalValue());
    assertEquals(PREAD_TIME_VALUE, metrics.preadLatency.getMinTime());
    assertEquals(THREAD_COUNT * OPERATIONS_PER_THREAD,
        metrics.readOps.getCurrentIntervalValue());
    assertEquals(THREAD_COUNT * OPERATIONS_PER_THREAD,
        metrics.readsFromLocalFile.getCurrentIntervalValue());
    assertEquals(THREAD_COUNT * OPERATIONS_PER_THREAD * READ_SIZE_VALUE,
        metrics.readSize.getCurrentIntervalValue());
    assertEquals(READ_TIME_VALUE, metrics.readLatency.getMinTime());
    assertEquals(SYNC_TIME_VALUE, metrics.syncLatency.getMinTime());
    assertEquals(THREAD_COUNT * OPERATIONS_PER_THREAD,
        metrics.writeOps.getCurrentIntervalValue());
    assertEquals(THREAD_COUNT * OPERATIONS_PER_THREAD * WRITE_SIZE_VALUE,
        metrics.writeSize.getCurrentIntervalValue());
  }
}
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