jasonstack commented on a change in pull request #835:
URL: https://github.com/apache/cassandra/pull/835#discussion_r533927262
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File path: test/unit/org/apache/cassandra/db/ColumnFamilyMetricTest.java
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@@ -140,6 +133,101 @@ public void testStartupRaceConditionOnMetricListeners()
}
}
+ @Test
+ public void testEstimatedColumnCountHistogramAndEstimatedRowSizeHistogram()
+ {
+ Keyspace keyspace = Keyspace.open("Keyspace1");
+ ColumnFamilyStore store = keyspace.getColumnFamilyStore("Standard2");
+
+ store.disableAutoCompaction();
+
+ try
+ {
+ // Ensure that there is no SSTables
+ store.truncateBlocking();
+
+ assertArrayEquals(new long[0],
store.metric.estimatedColumnCountHistogram.getValue());
+
+ applyMutation(store.metadata(), "0", bytes(0),
FBUtilities.timestampMicros());
+ applyMutation(store.metadata(), "1", bytes(1),
FBUtilities.timestampMicros());
+
+ // Flushing first SSTable
+ store.forceBlockingFlush();
+
+ long[] estimatedColumnCountHistogram =
store.metric.estimatedColumnCountHistogram.getValue();
+ assertNumberOfNonZeroValue(estimatedColumnCountHistogram, 1);
+ assertEquals(2, estimatedColumnCountHistogram[0]); //2 rows of one
cell in 1 SSTable
+
+ long[] estimatedRowSizeHistogram =
store.metric.estimatedPartitionSizeHistogram.getValue();
+ // Due to the timestamps we cannot guaranty the size of the row.
So we can only check the number of histogram updates.
+ assertEquals(sumValues(estimatedRowSizeHistogram), 2);
+
+ applyMutation(store.metadata(), "2", bytes(2),
FBUtilities.timestampMicros());
+
+ // Flushing second SSTable
+ store.forceBlockingFlush();
+
+ estimatedColumnCountHistogram =
store.metric.estimatedColumnCountHistogram.getValue();
+ assertNumberOfNonZeroValue(estimatedColumnCountHistogram, 1);
+ assertEquals(3, estimatedColumnCountHistogram[0]); //2 rows of one
cell in the first SSTable and 1 row of one cell int the second sstable
+
+ estimatedRowSizeHistogram =
store.metric.estimatedPartitionSizeHistogram.getValue();
+ assertEquals(sumValues(estimatedRowSizeHistogram), 3);
+ }
+ finally
+ {
+ store.enableAutoCompaction();
+ }
+ }
+
+ @Test
+ public void testAddHistogram()
+ {
+ long[] sums = new long[] {0, 0, 0};
+ long[] smaller = new long[] {1, 2};
+
+ long[] result = TableMetrics.addHistogram(sums, smaller);
+ assertTrue(result == sums); // Check that we did not create a new array
+ assertArrayEquals(new long[]{1, 2, 0}, result);
+
+ long[] equal = new long[] {5, 6, 7};
+
+ result = TableMetrics.addHistogram(sums, equal);
+ assertTrue(result == sums); // Check that we did not create a new array
+ assertArrayEquals(new long[]{6, 8, 7}, result);
+
+ long[] empty = new long[0];
+
+ result = TableMetrics.addHistogram(sums, empty);
+ assertTrue(result == sums); // Check that we did not create a new array
+ assertArrayEquals(new long[]{6, 8, 7}, result);
+
+ long[] greater = new long[] {4, 3, 2, 1};
+ result = TableMetrics.addHistogram(sums, greater);
+ assertFalse(result == sums); // Check that we did not create a new
array
Review comment:
```suggestion
assertFalse(result == sums); // Check that we did create a new array
```
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