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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
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
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package org.apache.cassandra.db;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import com.google.common.util.concurrent.Uninterruptibles;
import org.junit.AfterClass;
import org.junit.Test;
import org.apache.cassandra.SchemaLoader;
import org.apache.cassandra.Util;
import org.apache.cassandra.cache.KeyCacheKey;
import org.apache.cassandra.concurrent.ScheduledExecutors;
import org.apache.cassandra.db.composites.*;
import org.apache.cassandra.db.compaction.CompactionManager;
import org.apache.cassandra.db.filter.QueryFilter;
import org.apache.cassandra.io.sstable.SSTableReader;
import org.apache.cassandra.service.CacheService;
import org.apache.cassandra.utils.ByteBufferUtil;
import org.apache.cassandra.utils.concurrent.Refs;
import static org.junit.Assert.assertEquals;
public class KeyCacheTest extends SchemaLoader
{
private static final String KEYSPACE1 = "KeyCacheSpace";
private static final String COLUMN_FAMILY1 = "Standard1";
private static final String COLUMN_FAMILY2 = "Standard2";
@AfterClass
public static void cleanup()
{
cleanupSavedCaches();
}
@Test
public void testKeyCacheLoad() throws Exception
{
CompactionManager.instance.disableAutoCompaction();
ColumnFamilyStore store = Keyspace.open(KEYSPACE1).getColumnFamilyStore(COLUMN_FAMILY2);
// empty the cache
CacheService.instance.invalidateKeyCache();
assertKeyCacheSize(0, KEYSPACE1, COLUMN_FAMILY2);
// insert data and force to disk
insertData(KEYSPACE1, COLUMN_FAMILY2, 0, 100);
store.forceBlockingFlush();
// populate the cache
readData(KEYSPACE1, COLUMN_FAMILY2, 0, 100);
assertKeyCacheSize(100, KEYSPACE1, COLUMN_FAMILY2);
// really? our caches don't implement the map interface? (hence no .addAll)
Map<KeyCacheKey, RowIndexEntry> savedMap = new HashMap<KeyCacheKey, RowIndexEntry>();
for (KeyCacheKey k : CacheService.instance.keyCache.getKeySet())
{
if (k.desc.ksname.equals(KEYSPACE1) && k.desc.cfname.equals(COLUMN_FAMILY2))
savedMap.put(k, CacheService.instance.keyCache.get(k));
}
// force the cache to disk
CacheService.instance.keyCache.submitWrite(Integer.MAX_VALUE).get();
CacheService.instance.invalidateKeyCache();
assertKeyCacheSize(0, KEYSPACE1, COLUMN_FAMILY2);
CacheService.instance.keyCache.loadSaved(store);
assertKeyCacheSize(savedMap.size(), KEYSPACE1, COLUMN_FAMILY2);
// probably it's better to add equals/hashCode to RowIndexEntry...
for (Map.Entry<KeyCacheKey, RowIndexEntry> entry : savedMap.entrySet())
{
RowIndexEntry expected = entry.getValue();
RowIndexEntry actual = CacheService.instance.keyCache.get(entry.getKey());
assertEquals(expected.position, actual.position);
assertEquals(expected.columnsIndex(), actual.columnsIndex());
if (expected.isIndexed())
{
assertEquals(expected.deletionTime(), actual.deletionTime());
}
}
}
@Test
public void testKeyCache() throws ExecutionException, InterruptedException
{
CompactionManager.instance.disableAutoCompaction();
Keyspace keyspace = Keyspace.open(KEYSPACE1);
ColumnFamilyStore cfs = keyspace.getColumnFamilyStore(COLUMN_FAMILY1);
// just to make sure that everything is clean
CacheService.instance.invalidateKeyCache();
// KeyCache should start at size 0 if we're caching X% of zero data.
assertKeyCacheSize(0, KEYSPACE1, COLUMN_FAMILY1);
DecoratedKey key1 = Util.dk("key1");
DecoratedKey key2 = Util.dk("key2");
Mutation rm;
// inserts
rm = new Mutation(KEYSPACE1, key1.getKey());
rm.add(COLUMN_FAMILY1, Util.cellname("1"), ByteBufferUtil.EMPTY_BYTE_BUFFER, 0);
rm.apply();
rm = new Mutation(KEYSPACE1, key2.getKey());
rm.add(COLUMN_FAMILY1, Util.cellname("2"), ByteBufferUtil.EMPTY_BYTE_BUFFER, 0);
rm.apply();
// to make sure we have SSTable
cfs.forceBlockingFlush();
// reads to cache key position
cfs.getColumnFamily(QueryFilter.getSliceFilter(key1,
COLUMN_FAMILY1,
Composites.EMPTY,
Composites.EMPTY,
false,
10,
System.currentTimeMillis()));
cfs.getColumnFamily(QueryFilter.getSliceFilter(key2,
COLUMN_FAMILY1,
Composites.EMPTY,
Composites.EMPTY,
false,
10,
System.currentTimeMillis()));
assertKeyCacheSize(2, KEYSPACE1, COLUMN_FAMILY1);
Set<SSTableReader> readers = cfs.getDataTracker().getSSTables();
Refs<SSTableReader> refs = Refs.tryRef(readers);
if (refs == null)
throw new IllegalStateException();
Util.compactAll(cfs, Integer.MAX_VALUE).get();
// after compaction cache should have entries for new SSTables,
// but since we have kept a reference to the old sstables,
// if we had 2 keys in cache previously it should become 4
assertKeyCacheSize(4, KEYSPACE1, COLUMN_FAMILY1);
refs.release();
Uninterruptibles.sleepUninterruptibly(10, TimeUnit.MILLISECONDS);;
while (ScheduledExecutors.nonPeriodicTasks.getActiveCount() + ScheduledExecutors.nonPeriodicTasks.getQueue().size() > 0);
// after releasing the reference this should drop to 2
assertKeyCacheSize(2, KEYSPACE1, COLUMN_FAMILY1);
// re-read same keys to verify that key cache didn't grow further
cfs.getColumnFamily(QueryFilter.getSliceFilter(key1,
COLUMN_FAMILY1,
Composites.EMPTY,
Composites.EMPTY,
false,
10,
System.currentTimeMillis()));
cfs.getColumnFamily(QueryFilter.getSliceFilter(key2,
COLUMN_FAMILY1,
Composites.EMPTY,
Composites.EMPTY,
false,
10,
System.currentTimeMillis()));
assertKeyCacheSize(2, KEYSPACE1, COLUMN_FAMILY1);
}
private void assertKeyCacheSize(int expected, String keyspace, String columnFamily)
{
int size = 0;
for (KeyCacheKey k : CacheService.instance.keyCache.getKeySet())
{
if (k.desc.ksname.equals(keyspace) && k.desc.cfname.equals(columnFamily))
size++;
}
assertEquals(expected, size);
}
}