package org.apache.cassandra.io;
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*
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import java.io.IOException;
import java.util.*;
import java.util.concurrent.ExecutionException;
import org.junit.Test;
import org.apache.cassandra.CleanupHelper;
import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.cassandra.db.*;
import org.apache.cassandra.db.filter.QueryPath;
import org.apache.cassandra.io.util.BufferedRandomAccessFile;
import org.apache.cassandra.io.util.FileDataInput;
import org.apache.cassandra.service.StorageService;
import org.apache.cassandra.utils.FBUtilities;
import static org.junit.Assert.assertEquals;
public class SSTableReaderTest extends CleanupHelper
{
@Test
public void testSpannedIndexPositions() throws IOException, ExecutionException, InterruptedException
{
SSTableReader.BUFFER_SIZE = 40; // each index entry is ~11 bytes, so this will generate lots of spanned entries
Table table = Table.open("Keyspace1");
ColumnFamilyStore store = table.getColumnFamilyStore("Standard1");
// insert a bunch of data and compact to a single sstable
CompactionManager.instance.disableAutoCompaction();
for (int j = 0; j < 100; j += 2)
{
String key = String.valueOf(j);
RowMutation rm = new RowMutation("Keyspace1", key);
rm.add(new QueryPath("Standard1", null, "0".getBytes()), new byte[0], j);
rm.apply();
}
store.forceBlockingFlush();
CompactionManager.instance.submitMajor(store).get();
// check that all our keys are found correctly
SSTableReader sstable = store.getSSTables().iterator().next();
for (int j = 0; j < 100; j += 2)
{
String key = String.valueOf(j);
DecoratedKey dk = StorageService.getPartitioner().decorateKey(key);
FileDataInput file = sstable.getFileDataInput(dk, DatabaseDescriptor.getIndexedReadBufferSizeInKB() * 1024);
DecoratedKey keyInDisk = sstable.getPartitioner().convertFromDiskFormat(file.readUTF());
assert keyInDisk.equals(dk) : String.format("%s != %s in %s", keyInDisk, dk, file.getPath());
}
// check no false positives
for (int j = 1; j < 110; j += 2)
{
String key = String.valueOf(j);
DecoratedKey dk = StorageService.getPartitioner().decorateKey(key);
assert sstable.getPosition(dk) == null;
}
// check positionsize information
assert sstable.indexSummary.getSpannedIndexDataPositions().entrySet().size() > 0;
for (Map.Entry<IndexSummary.KeyPosition, SSTable.PositionSize> entry : sstable.indexSummary.getSpannedIndexDataPositions().entrySet())
{
IndexSummary.KeyPosition kp = entry.getKey();
SSTable.PositionSize info = entry.getValue();
long nextIndexPosition = kp.indexPosition + 2 + FBUtilities.encodedUTF8Length(StorageService.getPartitioner().convertToDiskFormat(kp.key)) + 8;
BufferedRandomAccessFile indexFile = new BufferedRandomAccessFile(sstable.indexFilename(), "r");
indexFile.seek(nextIndexPosition);
String nextKey = indexFile.readUTF();
BufferedRandomAccessFile file = new BufferedRandomAccessFile(sstable.getFilename(), "r");
file.seek(info.position + info.size);
assertEquals(nextKey, file.readUTF());
}
}
}