package org.apache.cassandra.db;
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*
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* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing,
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import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ExecutionException;
import org.junit.Test;
import org.apache.cassandra.CleanupHelper;
import org.apache.cassandra.Util;
import org.apache.cassandra.db.filter.QueryPath;
import org.apache.cassandra.io.sstable.Descriptor;
import org.apache.cassandra.utils.ByteBufferUtil;
import org.apache.cassandra.utils.Pair;
public class KeyCacheTest extends CleanupHelper
{
private static final String TABLE1 = "KeyCacheSpace";
private static final String COLUMN_FAMILY1 = "Standard1";
private static final String COLUMN_FAMILY2 = "Standard2";
@Test
public void testKeyCache50() throws IOException, ExecutionException, InterruptedException
{
testKeyCache(COLUMN_FAMILY1, 64);
}
@Test
public void testKeyCache100() throws IOException, ExecutionException, InterruptedException
{
testKeyCache(COLUMN_FAMILY2, 128);
}
@Test
public void testKeyCacheLoad() throws Exception
{
CompactionManager.instance.disableAutoCompaction();
ColumnFamilyStore store = Table.open(TABLE1).getColumnFamilyStore(COLUMN_FAMILY2);
// empty the cache
store.invalidateKeyCache();
assert store.getKeyCacheSize() == 0;
// insert data and force to disk
insertData(TABLE1, COLUMN_FAMILY2, 0, 100);
store.forceBlockingFlush();
// populate the cache
readData(TABLE1, COLUMN_FAMILY2, 0, 100);
assert store.getKeyCacheSize() == 100;
// really? our caches don't implement the map interface? (hence no .addAll)
Map<Pair<Descriptor, DecoratedKey>, Long> savedMap = new HashMap<Pair<Descriptor, DecoratedKey>, Long>();
for (Map.Entry<Pair<Descriptor, DecoratedKey>, Long> entry : store.getKeyCache().getEntrySet())
{
savedMap.put(entry.getKey(), entry.getValue());
}
// force the cache to disk
store.submitKeyCacheWrite().get();
// empty the cache again to make sure values came from disk
store.invalidateKeyCache();
assert store.getKeyCacheSize() == 0;
// load the cache from disk
store.unregisterMBean(); // unregistering old MBean to test how key cache will be loaded
ColumnFamilyStore newStore = ColumnFamilyStore.createColumnFamilyStore(Table.open(TABLE1), COLUMN_FAMILY2);
assert newStore.getKeyCacheSize() == 100;
assert savedMap.size() == 100;
for (Map.Entry<Pair<Descriptor, DecoratedKey>, Long> entry : savedMap.entrySet())
{
assert newStore.getKeyCache().get(entry.getKey()).equals(entry.getValue());
}
}
public void testKeyCache(String cfName, int expectedCacheSize) throws IOException, ExecutionException, InterruptedException
{
CompactionManager.instance.disableAutoCompaction();
Table table = Table.open(TABLE1);
ColumnFamilyStore store = table.getColumnFamilyStore(cfName);
// KeyCache should start at size 1 if we're caching X% of zero data.
int keyCacheSize = store.getKeyCacheCapacity();
assert keyCacheSize == 1 : keyCacheSize;
DecoratedKey key1 = Util.dk("key1");
DecoratedKey key2 = Util.dk("key2");
RowMutation rm;
// inserts
rm = new RowMutation(TABLE1, key1.key);
rm.add(new QueryPath(cfName, null, ByteBufferUtil.bytes("1")), ByteBufferUtil.EMPTY_BYTE_BUFFER, 0);
rm.apply();
rm = new RowMutation(TABLE1, key2.key);
rm.add(new QueryPath(cfName, null, ByteBufferUtil.bytes("2")), ByteBufferUtil.EMPTY_BYTE_BUFFER, 0);
rm.apply();
// deletes
rm = new RowMutation(TABLE1, key1.key);
rm.delete(new QueryPath(cfName, null, ByteBufferUtil.bytes("1")), 1);
rm.apply();
rm = new RowMutation(TABLE1, key2.key);
rm.delete(new QueryPath(cfName, null, ByteBufferUtil.bytes("2")), 1);
rm.apply();
// After a flush, the cache should expand to be X% of indices * INDEX_INTERVAL.
store.forceBlockingFlush();
keyCacheSize = store.getKeyCacheCapacity();
assert keyCacheSize == expectedCacheSize : keyCacheSize;
// After a compaction, the cache should expand to be X% of zero data.
CompactionManager.instance.submitMajor(store, 0, Integer.MAX_VALUE).get();
keyCacheSize = store.getKeyCacheCapacity();
assert keyCacheSize == 1 : keyCacheSize;
}
}