Examples with SplittingSizeTieredCompactionWriter org.apache.cassandra.db.compaction.writers.SplittingSizeTieredCompactionWriter used on opensource projects

Example 1 with SplittingSizeTieredCompactionWriter

use of org.apache.cassandra.db.compaction.writers.SplittingSizeTieredCompactionWriter in project cassandra by apache.

the class CompactionAwareWriterTest method testSplittingSizeTieredCompactionWriter.

@Test
public void testSplittingSizeTieredCompactionWriter() throws Throwable {
    ColumnFamilyStore cfs = getColumnFamilyStore();
    cfs.disableAutoCompaction();
    int rowCount = 10000;
    populate(rowCount);
    LifecycleTransaction txn = cfs.getTracker().tryModify(cfs.getLiveSSTables(), OperationType.COMPACTION);
    long beforeSize = txn.originals().iterator().next().onDiskLength();
    CompactionAwareWriter writer = new SplittingSizeTieredCompactionWriter(cfs, cfs.getDirectories(), txn, txn.originals(), 0);
    int rows = compact(cfs, txn, writer);
    long expectedSize = beforeSize / 2;
    List<SSTableReader> sortedSSTables = new ArrayList<>(cfs.getLiveSSTables());
    Collections.sort(sortedSSTables, new Comparator<SSTableReader>() {

        @Override
        public int compare(SSTableReader o1, SSTableReader o2) {
            return Longs.compare(o2.onDiskLength(), o1.onDiskLength());
        }
    });
    for (SSTableReader sstable : sortedSSTables) {
        // we dont create smaller files than this, everything will be in the last file
        if (expectedSize > SplittingSizeTieredCompactionWriter.DEFAULT_SMALLEST_SSTABLE_BYTES)
            // allow 1% diff in estimated vs actual size
            assertEquals(expectedSize, sstable.onDiskLength(), expectedSize / 100);
        expectedSize /= 2;
    }
    assertEquals(rowCount, rows);
    validateData(cfs, rowCount);
    cfs.truncateBlocking();
}