hudi-client/hudi-spark-client/src/test/java/org/apache/hudi/index/hbase/TestHBasePutBatchSizeCalculator.java

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package org.apache.hudi.index.hbase;

import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.assertEquals;

public class TestHBasePutBatchSizeCalculator {

  @Test
  public void testPutBatchSizeCalculation() {
    SparkHoodieHBaseIndex.HBasePutBatchSizeCalculator batchSizeCalculator = new SparkHoodieHBaseIndex.HBasePutBatchSizeCalculator();

    // All asserts cases below are derived out of the first
    // example below, with change in one parameter at a time.

    int putBatchSize = batchSizeCalculator.getBatchSize(10, 16667, 1200, 200, 100, 0.1f);
    // Expected batchSize is 8 because in that case, total request sent in one second is below
    // 8 (batchSize) * 200 (parallelism) * 10 (maxReqsInOneSecond) * 10 (numRegionServers) * 0.1 (qpsFraction)) => 16000
    // We assume requests get distributed to Region Servers uniformly, so each RS gets 1600 request
    // 1600 happens to be 10% of 16667 (maxQPSPerRegionServer) as expected.
    assertEquals(8, putBatchSize);

    // Number of Region Servers are halved, total requests sent in a second are also halved, so batchSize is also halved
    int putBatchSize2 = batchSizeCalculator.getBatchSize(5, 16667, 1200, 200, 100, 0.1f);
    assertEquals(4, putBatchSize2);

    // If the parallelism is halved, batchSize has to double
    int putBatchSize3 = batchSizeCalculator.getBatchSize(10, 16667, 1200, 100, 100, 0.1f);
    assertEquals(16, putBatchSize3);

    // If the parallelism is halved, batchSize has to double.
    // This time parallelism is driven by numTasks rather than numExecutors
    int putBatchSize4 = batchSizeCalculator.getBatchSize(10, 16667, 100, 200, 100, 0.1f);
    assertEquals(16, putBatchSize4);

    // If sleepTimeMs is halved, batchSize has to halve
    int putBatchSize5 = batchSizeCalculator.getBatchSize(10, 16667, 1200, 200, 100, 0.05f);
    assertEquals(4, putBatchSize5);

    // If maxQPSPerRegionServer is doubled, batchSize also doubles
    int putBatchSize6 = batchSizeCalculator.getBatchSize(10, 33334, 1200, 200, 100, 0.1f);
    assertEquals(16, putBatchSize6);
  }

}