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From jbel...@apache.org
Subject [5/6] git commit: merge from 1.2
Date Mon, 04 Nov 2013 21:26:32 GMT
merge from 1.2


Project: http://git-wip-us.apache.org/repos/asf/cassandra/repo
Commit: http://git-wip-us.apache.org/repos/asf/cassandra/commit/e0eb517e
Tree: http://git-wip-us.apache.org/repos/asf/cassandra/tree/e0eb517e
Diff: http://git-wip-us.apache.org/repos/asf/cassandra/diff/e0eb517e

Branch: refs/heads/cassandra-2.0
Commit: e0eb517e0751e8e74b928915c6e2f2d2619a9c08
Parents: 9a1d2cc 3d58c5a
Author: Jonathan Ellis <jbellis@apache.org>
Authored: Mon Nov 4 15:26:10 2013 -0600
Committer: Jonathan Ellis <jbellis@apache.org>
Committed: Mon Nov 4 15:26:10 2013 -0600

----------------------------------------------------------------------
 CHANGES.txt                                          | 2 ++
 src/java/org/apache/cassandra/db/SystemKeyspace.java | 4 ----
 2 files changed, 2 insertions(+), 4 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/cassandra/blob/e0eb517e/CHANGES.txt
----------------------------------------------------------------------
diff --cc CHANGES.txt
index 38fd876,fd3af68..6e9ea33
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@@ -25,42 -9,11 +25,44 @@@ Merged from 1.2
   * Require logging in for Thrift CQL2/3 statement preparation (CASSANDRA-6254)
   * restrict max_num_tokens to 1536 (CASSANDRA-6267)
   * Nodetool gets default JMX port from cassandra-env.sh (CASSANDRA-6273)
+  * make calculatePendingRanges asynchronous (CASSANDRA-6244)
+  * Remove blocking flushes in gossip thread (CASSANDRA-6297)
  
  
 -1.2.11
 +2.0.2
 + * Update FailureDetector to use nanontime (CASSANDRA-4925)
 + * Fix FileCacheService regressions (CASSANDRA-6149)
 + * Never return WriteTimeout for CL.ANY (CASSANDRA-6032)
 + * Fix race conditions in bulk loader (CASSANDRA-6129)
 + * Add configurable metrics reporting (CASSANDRA-4430)
 + * drop queries exceeding a configurable number of tombstones (CASSANDRA-6117)
 + * Track and persist sstable read activity (CASSANDRA-5515)
 + * Fixes for speculative retry (CASSANDRA-5932, CASSANDRA-6194)
 + * Improve memory usage of metadata min/max column names (CASSANDRA-6077)
 + * Fix thrift validation refusing row markers on CQL3 tables (CASSANDRA-6081)
 + * Fix insertion of collections with CAS (CASSANDRA-6069)
 + * Correctly send metadata on SELECT COUNT (CASSANDRA-6080)
 + * Track clients' remote addresses in ClientState (CASSANDRA-6070)
 + * Create snapshot dir if it does not exist when migrating
 +   leveled manifest (CASSANDRA-6093)
 + * make sequential nodetool repair the default (CASSANDRA-5950)
 + * Add more hooks for compaction strategy implementations (CASSANDRA-6111)
 + * Fix potential NPE on composite 2ndary indexes (CASSANDRA-6098)
 + * Delete can potentially be skipped in batch (CASSANDRA-6115)
 + * Allow alter keyspace on system_traces (CASSANDRA-6016)
 + * Disallow empty column names in cql (CASSANDRA-6136)
 + * Use Java7 file-handling APIs and fix file moving on Windows (CASSANDRA-5383)
 + * Save compaction history to system keyspace (CASSANDRA-5078)
 + * Fix NPE if StorageService.getOperationMode() is executed before full startup (CASSANDRA-6166)
 + * CQL3: support pre-epoch longs for TimestampType (CASSANDRA-6212)
 + * Add reloadtriggers command to nodetool (CASSANDRA-4949)
 + * cqlsh: ignore empty 'value alias' in DESCRIBE (CASSANDRA-6139)
 + * Fix sstable loader (CASSANDRA-6205)
 + * Reject bootstrapping if the node already exists in gossip (CASSANDRA-5571)
 + * Fix NPE while loading paxos state (CASSANDRA-6211)
 + * cqlsh: add SHOW SESSION <tracing-session> command (CASSANDRA-6228)
 +Merged from 1.2:
 + * (Hadoop) Require CFRR batchSize to be at least 2 (CASSANDRA-6114)
   * Add a warning for small LCS sstable size (CASSANDRA-6191)
   * Add ability to list specific KS/CF combinations in nodetool cfstats (CASSANDRA-4191)
   * Mark CF clean if a mutation raced the drop and got it marked dirty (CASSANDRA-5946)

http://git-wip-us.apache.org/repos/asf/cassandra/blob/e0eb517e/src/java/org/apache/cassandra/db/SystemKeyspace.java
----------------------------------------------------------------------
diff --cc src/java/org/apache/cassandra/db/SystemKeyspace.java
index 0dbf36f,0000000..9093ec0
mode 100644,000000..100644
--- a/src/java/org/apache/cassandra/db/SystemKeyspace.java
+++ b/src/java/org/apache/cassandra/db/SystemKeyspace.java
@@@ -1,954 -1,0 +1,950 @@@
 +/*
 + * Licensed to the Apache Software Foundation (ASF) under one
 + * or more contributor license agreements.  See the NOTICE file
 + * distributed with this work for additional information
 + * regarding copyright ownership.  The ASF licenses this file
 + * 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,
 + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 + * See the License for the specific language governing permissions and
 + * limitations under the License.
 + */
 +package org.apache.cassandra.db;
 +
 +import java.io.DataInputStream;
 +import java.io.IOException;
 +import java.net.InetAddress;
 +import java.nio.ByteBuffer;
 +import java.util.*;
 +import javax.management.openmbean.*;
 +
 +import com.google.common.base.Function;
 +import com.google.common.collect.HashMultimap;
 +import com.google.common.collect.Iterables;
 +import com.google.common.collect.SetMultimap;
 +import com.google.common.collect.Sets;
 +
 +import org.apache.cassandra.db.compaction.CompactionHistoryTabularData;
 +import org.apache.cassandra.metrics.RestorableMeter;
 +import org.apache.cassandra.transport.Server;
 +import org.apache.commons.lang3.StringUtils;
 +import org.slf4j.Logger;
 +import org.slf4j.LoggerFactory;
 +
 +import org.apache.cassandra.config.CFMetaData;
 +import org.apache.cassandra.config.DatabaseDescriptor;
 +import org.apache.cassandra.config.KSMetaData;
 +import org.apache.cassandra.config.Schema;
 +import org.apache.cassandra.cql3.QueryProcessor;
 +import org.apache.cassandra.cql3.UntypedResultSet;
 +import org.apache.cassandra.db.columniterator.IdentityQueryFilter;
 +import org.apache.cassandra.db.commitlog.ReplayPosition;
 +import org.apache.cassandra.db.filter.QueryFilter;
 +import org.apache.cassandra.db.marshal.*;
 +import org.apache.cassandra.dht.Range;
 +import org.apache.cassandra.dht.Token;
 +import org.apache.cassandra.exceptions.ConfigurationException;
 +import org.apache.cassandra.io.sstable.SSTableReader;
 +import org.apache.cassandra.io.util.DataOutputBuffer;
 +import org.apache.cassandra.locator.IEndpointSnitch;
 +import org.apache.cassandra.service.StorageService;
 +import org.apache.cassandra.service.paxos.Commit;
 +import org.apache.cassandra.service.paxos.PaxosState;
 +import org.apache.cassandra.thrift.cassandraConstants;
 +import org.apache.cassandra.utils.*;
 +
 +import static org.apache.cassandra.cql3.QueryProcessor.processInternal;
 +
 +public class SystemKeyspace
 +{
 +    private static final Logger logger = LoggerFactory.getLogger(SystemKeyspace.class);
 +
 +    // see CFMetaData for schema definitions
 +    public static final String PEERS_CF = "peers";
 +    public static final String PEER_EVENTS_CF = "peer_events";
 +    public static final String LOCAL_CF = "local";
 +    public static final String INDEX_CF = "IndexInfo";
 +    public static final String COUNTER_ID_CF = "NodeIdInfo";
 +    public static final String HINTS_CF = "hints";
 +    public static final String RANGE_XFERS_CF = "range_xfers";
 +    public static final String BATCHLOG_CF = "batchlog";
 +    // see layout description in the DefsTables class header
 +    public static final String SCHEMA_KEYSPACES_CF = "schema_keyspaces";
 +    public static final String SCHEMA_COLUMNFAMILIES_CF = "schema_columnfamilies";
 +    public static final String SCHEMA_COLUMNS_CF = "schema_columns";
 +    public static final String SCHEMA_TRIGGERS_CF = "schema_triggers";
 +    public static final String COMPACTION_LOG = "compactions_in_progress";
 +    public static final String PAXOS_CF = "paxos";
 +    public static final String SSTABLE_ACTIVITY_CF = "sstable_activity";
 +    public static final String COMPACTION_HISTORY_CF = "compaction_history";
 +
 +    private static final String LOCAL_KEY = "local";
 +    private static final ByteBuffer ALL_LOCAL_NODE_ID_KEY = ByteBufferUtil.bytes("Local");
 +
 +    public enum BootstrapState
 +    {
 +        NEEDS_BOOTSTRAP,
 +        COMPLETED,
 +        IN_PROGRESS
 +    }
 +
 +    private static DecoratedKey decorate(ByteBuffer key)
 +    {
 +        return StorageService.getPartitioner().decorateKey(key);
 +    }
 +
 +    public static void finishStartup()
 +    {
 +        setupVersion();
 +
 +        copyAllAliasesToColumnsProper();
 +
 +        // add entries to system schema columnfamilies for the hardcoded system definitions
 +        for (String ksname : Schema.systemKeyspaceNames)
 +        {
 +            KSMetaData ksmd = Schema.instance.getKSMetaData(ksname);
 +
 +            // delete old, possibly obsolete entries in schema columnfamilies
 +            for (String cfname : Arrays.asList(SystemKeyspace.SCHEMA_KEYSPACES_CF, SystemKeyspace.SCHEMA_COLUMNFAMILIES_CF,
SystemKeyspace.SCHEMA_COLUMNS_CF))
 +            {
 +                String req = String.format("DELETE FROM system.%s WHERE keyspace_name =
'%s'", cfname, ksmd.name);
 +                processInternal(req);
 +            }
 +
 +            // (+1 to timestamp to make sure we don't get shadowed by the tombstones we
just added)
 +            ksmd.toSchema(FBUtilities.timestampMicros() + 1).apply();
 +        }
 +    }
 +
 +    // Starting with 2.0 (CASSANDRA-5125) we keep all the 'aliases' in system.schema_columns
together with the regular columns,
 +    // but only for the newly-created tables. This migration is for the pre-2.0 created
tables.
 +    private static void copyAllAliasesToColumnsProper()
 +    {
 +        for (UntypedResultSet.Row row : processInternal(String.format("SELECT * FROM system.%s",
SCHEMA_COLUMNFAMILIES_CF)))
 +        {
 +            CFMetaData table = CFMetaData.fromSchema(row);
 +            String query = String.format("SELECT writetime(type) "
 +                                         + "FROM system.%s "
 +                                         + "WHERE keyspace_name = '%s' AND columnfamily_name
= '%s'",
 +                                         SCHEMA_COLUMNFAMILIES_CF,
 +                                         table.ksName,
 +                                         table.cfName);
 +            long timestamp = processInternal(query).one().getLong("writetime(type)");
 +            try
 +            {
 +                table.toSchema(timestamp).apply();
 +            }
 +            catch (ConfigurationException e)
 +            {
 +                // shouldn't happen
 +            }
 +        }
 +    }
 +
 +    private static void setupVersion()
 +    {
 +        String req = "INSERT INTO system.%s (key, release_version, cql_version, thrift_version,
native_protocol_version, data_center, rack, partitioner) VALUES ('%s', '%s', '%s', '%s', '%s',
'%s', '%s', '%s')";
 +        IEndpointSnitch snitch = DatabaseDescriptor.getEndpointSnitch();
 +        processInternal(String.format(req, LOCAL_CF,
 +                                         LOCAL_KEY,
 +                                         FBUtilities.getReleaseVersionString(),
 +                                         QueryProcessor.CQL_VERSION.toString(),
 +                                         cassandraConstants.VERSION,
 +                                         Server.CURRENT_VERSION,
 +                                         snitch.getDatacenter(FBUtilities.getBroadcastAddress()),
 +                                         snitch.getRack(FBUtilities.getBroadcastAddress()),
 +                                         DatabaseDescriptor.getPartitioner().getClass().getName()));
 +    }
 +
 +    /**
 +     * Write compaction log, except columfamilies under system keyspace.
 +     *
 +     * @param cfs
 +     * @param toCompact sstables to compact
 +     * @return compaction task id or null if cfs is under system keyspace
 +     */
 +    public static UUID startCompaction(ColumnFamilyStore cfs, Iterable<SSTableReader>
toCompact)
 +    {
 +        if (Keyspace.SYSTEM_KS.equals(cfs.keyspace.getName()))
 +            return null;
 +
 +        UUID compactionId = UUIDGen.getTimeUUID();
 +        String req = "INSERT INTO system.%s (id, keyspace_name, columnfamily_name, inputs)
VALUES (%s, '%s', '%s', {%s})";
 +        Iterable<Integer> generations = Iterables.transform(toCompact, new Function<SSTableReader,
Integer>()
 +        {
 +            public Integer apply(SSTableReader sstable)
 +            {
 +                return sstable.descriptor.generation;
 +            }
 +        });
 +        processInternal(String.format(req, COMPACTION_LOG, compactionId, cfs.keyspace.getName(),
cfs.name, StringUtils.join(Sets.newHashSet(generations), ',')));
 +        forceBlockingFlush(COMPACTION_LOG);
 +        return compactionId;
 +    }
 +
 +    public static void finishCompaction(UUID taskId)
 +    {
 +        assert taskId != null;
 +
 +        String req = "DELETE FROM system.%s WHERE id = %s";
 +        processInternal(String.format(req, COMPACTION_LOG, taskId));
 +        forceBlockingFlush(COMPACTION_LOG);
 +    }
 +
 +    /**
 +     * @return unfinished compactions, grouped by keyspace/columnfamily pair.
 +     */
 +    public static SetMultimap<Pair<String, String>, Integer> getUnfinishedCompactions()
 +    {
 +        String req = "SELECT * FROM system.%s";
 +        UntypedResultSet resultSet = processInternal(String.format(req, COMPACTION_LOG));
 +
 +        SetMultimap<Pair<String, String>, Integer> unfinishedCompactions = HashMultimap.create();
 +        for (UntypedResultSet.Row row : resultSet)
 +        {
 +            String keyspace = row.getString("keyspace_name");
 +            String columnfamily = row.getString("columnfamily_name");
 +            Set<Integer> inputs = row.getSet("inputs", Int32Type.instance);
 +
 +            unfinishedCompactions.putAll(Pair.create(keyspace, columnfamily), inputs);
 +        }
 +        return unfinishedCompactions;
 +    }
 +
 +    public static void discardCompactionsInProgress()
 +    {
 +        ColumnFamilyStore compactionLog = Keyspace.open(Keyspace.SYSTEM_KS).getColumnFamilyStore(COMPACTION_LOG);
 +        compactionLog.truncateBlocking();
 +    }
 +
 +    public static void updateCompactionHistory(String ksname,
 +                                               String cfname,
 +                                               long compactedAt,
 +                                               long bytesIn,
 +                                               long bytesOut,
 +                                               Map<Integer, Long> rowsMerged)
 +    {
 +        // don't write anything when the history table itself is compacted, since that would
in turn cause new compactions
 +        if (ksname.equals("system") && cfname.equals(COMPACTION_HISTORY_CF))
 +            return;
 +        String req = "INSERT INTO system.%s (id, keyspace_name, columnfamily_name, compacted_at,
bytes_in, bytes_out, rows_merged) "
 +                     + "VALUES (%s, '%s', '%s', %d, %d, %d, {%s})";
 +        processInternal(String.format(req, COMPACTION_HISTORY_CF, UUIDGen.getTimeUUID().toString(),
ksname, cfname, compactedAt, bytesIn, bytesOut, FBUtilities.toString(rowsMerged)));
 +    }
 +
 +    public static TabularData getCompactionHistory() throws OpenDataException
 +    {
 +        UntypedResultSet queryResultSet = processInternal("SELECT * from system.compaction_history");
 +        return CompactionHistoryTabularData.from(queryResultSet);
 +    }
 +
 +    public static void saveTruncationRecord(ColumnFamilyStore cfs, long truncatedAt, ReplayPosition
position)
 +    {
 +        String req = "UPDATE system.%s SET truncated_at = truncated_at + %s WHERE key =
'%s'";
 +        processInternal(String.format(req, LOCAL_CF, truncationAsMapEntry(cfs, truncatedAt,
position), LOCAL_KEY));
 +        forceBlockingFlush(LOCAL_CF);
 +    }
 +
 +    /**
 +     * This method is used to remove information about truncation time for specified column
family
 +     */
 +    public static void removeTruncationRecord(UUID cfId)
 +    {
 +        String req = "DELETE truncated_at[%s] from system.%s WHERE key = '%s'";
 +        processInternal(String.format(req, cfId, LOCAL_CF, LOCAL_KEY));
 +        forceBlockingFlush(LOCAL_CF);
 +    }
 +
 +    private static String truncationAsMapEntry(ColumnFamilyStore cfs, long truncatedAt,
ReplayPosition position)
 +    {
 +        DataOutputBuffer out = new DataOutputBuffer();
 +        try
 +        {
 +            ReplayPosition.serializer.serialize(position, out);
 +            out.writeLong(truncatedAt);
 +        }
 +        catch (IOException e)
 +        {
 +            throw new RuntimeException(e);
 +        }
 +        return String.format("{%s: 0x%s}",
 +                             cfs.metadata.cfId,
 +                             ByteBufferUtil.bytesToHex(ByteBuffer.wrap(out.getData(), 0,
out.getLength())));
 +    }
 +
 +    public static Map<UUID, Pair<ReplayPosition, Long>> getTruncationRecords()
 +    {
 +        String req = "SELECT truncated_at FROM system.%s WHERE key = '%s'";
 +        UntypedResultSet rows = processInternal(String.format(req, LOCAL_CF, LOCAL_KEY));
 +        if (rows.isEmpty())
 +            return Collections.emptyMap();
 +
 +        UntypedResultSet.Row row = rows.one();
 +        Map<UUID, ByteBuffer> rawMap = row.getMap("truncated_at", UUIDType.instance,
BytesType.instance);
 +        if (rawMap == null)
 +            return Collections.emptyMap();
 +
 +        Map<UUID, Pair<ReplayPosition, Long>> positions = new HashMap<UUID,
Pair<ReplayPosition, Long>>();
 +        for (Map.Entry<UUID, ByteBuffer> entry : rawMap.entrySet())
 +            positions.put(entry.getKey(), truncationRecordFromBlob(entry.getValue()));
 +        return positions;
 +    }
 +
 +    private static Pair<ReplayPosition, Long> truncationRecordFromBlob(ByteBuffer
bytes)
 +    {
 +        try
 +        {
 +            DataInputStream in = new DataInputStream(ByteBufferUtil.inputStream(bytes));
 +            return Pair.create(ReplayPosition.serializer.deserialize(in), in.available()
> 0 ? in.readLong() : Long.MIN_VALUE);
 +        }
 +        catch (IOException e)
 +        {
 +            throw new RuntimeException(e);
 +        }
 +    }
 +
 +    /**
 +     * Record tokens being used by another node
 +     */
 +    public static synchronized void updateTokens(InetAddress ep, Collection<Token>
tokens)
 +    {
 +        if (ep.equals(FBUtilities.getBroadcastAddress()))
 +        {
 +            removeEndpoint(ep);
 +            return;
 +        }
 +
 +        String req = "INSERT INTO system.%s (peer, tokens) VALUES ('%s', %s)";
 +        processInternal(String.format(req, PEERS_CF, ep.getHostAddress(), tokensAsSet(tokens)));
-         forceBlockingFlush(PEERS_CF);
 +    }
 +
 +    public static synchronized void updatePreferredIP(InetAddress ep, InetAddress preferred_ip)
 +    {
 +        String req = "INSERT INTO system.%s (peer, preferred_ip) VALUES ('%s', '%s')";
 +        processInternal(String.format(req, PEERS_CF, ep.getHostAddress(), preferred_ip.getHostAddress()));
 +        forceBlockingFlush(PEERS_CF);
 +    }
 +
 +    public static synchronized void updatePeerInfo(InetAddress ep, String columnName, String
value)
 +    {
 +        if (ep.equals(FBUtilities.getBroadcastAddress()))
 +            return;
 +
 +        String req = "INSERT INTO system.%s (peer, %s) VALUES ('%s', %s)";
 +        processInternal(String.format(req, PEERS_CF, columnName, ep.getHostAddress(), value));
 +    }
 +
 +    public static synchronized void updateHintsDropped(InetAddress ep, UUID timePeriod,
int value)
 +    {
 +        // with 30 day TTL
 +        String req = "UPDATE system.%s USING TTL 2592000 SET hints_dropped[ %s ] = %s WHERE
peer = '%s'";
 +        processInternal(String.format(req, PEER_EVENTS_CF, timePeriod.toString(), value,
ep.getHostAddress()));
 +    }
 +
 +    public static synchronized void updateSchemaVersion(UUID version)
 +    {
 +        String req = "INSERT INTO system.%s (key, schema_version) VALUES ('%s', %s)";
 +        processInternal(String.format(req, LOCAL_CF, LOCAL_KEY, version.toString()));
 +    }
 +
 +    private static String tokensAsSet(Collection<Token> tokens)
 +    {
 +        Token.TokenFactory factory = StorageService.getPartitioner().getTokenFactory();
 +        StringBuilder sb = new StringBuilder();
 +        sb.append("{");
 +        Iterator<Token> iter = tokens.iterator();
 +        while (iter.hasNext())
 +        {
 +            sb.append("'").append(factory.toString(iter.next())).append("'");
 +            if (iter.hasNext())
 +                sb.append(",");
 +        }
 +        sb.append("}");
 +        return sb.toString();
 +    }
 +
 +    private static Collection<Token> deserializeTokens(Collection<String> tokensStrings)
 +    {
 +        Token.TokenFactory factory = StorageService.getPartitioner().getTokenFactory();
 +        List<Token> tokens = new ArrayList<Token>(tokensStrings.size());
 +        for (String tk : tokensStrings)
 +            tokens.add(factory.fromString(tk));
 +        return tokens;
 +    }
 +
 +    /**
 +     * Remove stored tokens being used by another node
 +     */
 +    public static synchronized void removeEndpoint(InetAddress ep)
 +    {
 +        String req = "DELETE FROM system.%s WHERE peer = '%s'";
 +        processInternal(String.format(req, PEERS_CF, ep.getHostAddress()));
-         forceBlockingFlush(PEERS_CF);
 +    }
 +
 +    /**
 +     * This method is used to update the System Keyspace with the new tokens for this node
 +    */
 +    public static synchronized void updateTokens(Collection<Token> tokens)
 +    {
 +        assert !tokens.isEmpty() : "removeEndpoint should be used instead";
 +        String req = "INSERT INTO system.%s (key, tokens) VALUES ('%s', %s)";
 +        processInternal(String.format(req, LOCAL_CF, LOCAL_KEY, tokensAsSet(tokens)));
 +        forceBlockingFlush(LOCAL_CF);
 +    }
 +
 +    /**
 +     * Convenience method to update the list of tokens in the local system keyspace.
 +     *
 +     * @param addTokens tokens to add
 +     * @param rmTokens tokens to remove
 +     * @return the collection of persisted tokens
 +     */
 +    public static synchronized Collection<Token> updateLocalTokens(Collection<Token>
addTokens, Collection<Token> rmTokens)
 +    {
 +        Collection<Token> tokens = getSavedTokens();
 +        tokens.removeAll(rmTokens);
 +        tokens.addAll(addTokens);
 +        updateTokens(tokens);
 +        return tokens;
 +    }
 +
 +    public static void forceBlockingFlush(String cfname)
 +    {
 +        if (!Boolean.getBoolean("cassandra.unsafesystem"))
 +            FBUtilities.waitOnFuture(Keyspace.open(Keyspace.SYSTEM_KS).getColumnFamilyStore(cfname).forceFlush());
 +    }
 +
 +    /**
 +     * Return a map of stored tokens to IP addresses
 +     *
 +     */
 +    public static SetMultimap<InetAddress, Token> loadTokens()
 +    {
 +        SetMultimap<InetAddress, Token> tokenMap = HashMultimap.create();
 +        for (UntypedResultSet.Row row : processInternal("SELECT peer, tokens FROM system."
+ PEERS_CF))
 +        {
 +            InetAddress peer = row.getInetAddress("peer");
 +            if (row.has("tokens"))
 +                tokenMap.putAll(peer, deserializeTokens(row.getSet("tokens", UTF8Type.instance)));
 +        }
 +
 +        return tokenMap;
 +    }
 +
 +    /**
 +     * Return a map of store host_ids to IP addresses
 +     *
 +     */
 +    public static Map<InetAddress, UUID> loadHostIds()
 +    {
 +        Map<InetAddress, UUID> hostIdMap = new HashMap<InetAddress, UUID>();
 +        for (UntypedResultSet.Row row : processInternal("SELECT peer, host_id FROM system."
+ PEERS_CF))
 +        {
 +            InetAddress peer = row.getInetAddress("peer");
 +            if (row.has("host_id"))
 +            {
 +                hostIdMap.put(peer, row.getUUID("host_id"));
 +            }
 +        }
 +        return hostIdMap;
 +    }
 +
 +    public static InetAddress getPreferredIP(InetAddress ep)
 +    {
 +        String req = "SELECT preferred_ip FROM system.%s WHERE peer='%s'";
 +        UntypedResultSet result = processInternal(String.format(req, PEERS_CF, ep.getHostAddress()));
 +        if (!result.isEmpty() && result.one().has("preferred_ip"))
 +            return result.one().getInetAddress("preferred_ip");
 +        return null;
 +    }
 +
 +    /**
 +     * Return a map of IP addresses containing a map of dc and rack info
 +     */
 +    public static Map<InetAddress, Map<String,String>> loadDcRackInfo()
 +    {
 +        Map<InetAddress, Map<String, String>> result = new HashMap<InetAddress,
Map<String, String>>();
 +        for (UntypedResultSet.Row row : processInternal("SELECT peer, data_center, rack
from system." + PEERS_CF))
 +        {
 +            InetAddress peer = row.getInetAddress("peer");
 +            if (row.has("data_center") && row.has("rack"))
 +            {
 +                Map<String, String> dcRack = new HashMap<String, String>();
 +                dcRack.put("data_center", row.getString("data_center"));
 +                dcRack.put("rack", row.getString("rack"));
 +                result.put(peer, dcRack);
 +            }
 +        }
 +        return result;
 +    }
 +
 +    /**
 +     * One of three things will happen if you try to read the system keyspace:
 +     * 1. files are present and you can read them: great
 +     * 2. no files are there: great (new node is assumed)
 +     * 3. files are present but you can't read them: bad
 +     * @throws ConfigurationException
 +     */
 +    public static void checkHealth() throws ConfigurationException
 +    {
 +        Keyspace keyspace;
 +        try
 +        {
 +            keyspace = Keyspace.open(Keyspace.SYSTEM_KS);
 +        }
 +        catch (AssertionError err)
 +        {
 +            // this happens when a user switches from OPP to RP.
 +            ConfigurationException ex = new ConfigurationException("Could not read system
keyspace!");
 +            ex.initCause(err);
 +            throw ex;
 +        }
 +        ColumnFamilyStore cfs = keyspace.getColumnFamilyStore(LOCAL_CF);
 +
 +        String req = "SELECT cluster_name FROM system.%s WHERE key='%s'";
 +        UntypedResultSet result = processInternal(String.format(req, LOCAL_CF, LOCAL_KEY));
 +
 +        if (result.isEmpty() || !result.one().has("cluster_name"))
 +        {
 +            // this is a brand new node
 +            if (!cfs.getSSTables().isEmpty())
 +                throw new ConfigurationException("Found system keyspace files, but they
couldn't be loaded!");
 +
 +            // no system files.  this is a new node.
 +            req = "INSERT INTO system.%s (key, cluster_name) VALUES ('%s', '%s')";
 +            processInternal(String.format(req, LOCAL_CF, LOCAL_KEY, DatabaseDescriptor.getClusterName()));
 +            return;
 +        }
 +
 +        String savedClusterName = result.one().getString("cluster_name");
 +        if (!DatabaseDescriptor.getClusterName().equals(savedClusterName))
 +            throw new ConfigurationException("Saved cluster name " + savedClusterName +
" != configured name " + DatabaseDescriptor.getClusterName());
 +    }
 +
 +    public static Collection<Token> getSavedTokens()
 +    {
 +        String req = "SELECT tokens FROM system.%s WHERE key='%s'";
 +        UntypedResultSet result = processInternal(String.format(req, LOCAL_CF, LOCAL_KEY));
 +        return result.isEmpty() || !result.one().has("tokens")
 +             ? Collections.<Token>emptyList()
 +             : deserializeTokens(result.one().<String>getSet("tokens", UTF8Type.instance));
 +    }
 +
 +    public static int incrementAndGetGeneration()
 +    {
 +        String req = "SELECT gossip_generation FROM system.%s WHERE key='%s'";
 +        UntypedResultSet result = processInternal(String.format(req, LOCAL_CF, LOCAL_KEY));
 +
 +        int generation;
 +        if (result.isEmpty() || !result.one().has("gossip_generation"))
 +        {
 +            // seconds-since-epoch isn't a foolproof new generation
 +            // (where foolproof is "guaranteed to be larger than the last one seen at this
ip address"),
 +            // but it's as close as sanely possible
 +            generation = (int) (System.currentTimeMillis() / 1000);
 +        }
 +        else
 +        {
 +            // Other nodes will ignore gossip messages about a node that have a lower generation
than previously seen.
 +            final int storedGeneration = result.one().getInt("gossip_generation") + 1;
 +            final int now = (int) (System.currentTimeMillis() / 1000);
 +            if (storedGeneration >= now)
 +            {
 +                logger.warn("Using stored Gossip Generation {} as it is greater than current
system time {}.  See CASSANDRA-3654 if you experience problems",
 +                            storedGeneration, now);
 +                generation = storedGeneration;
 +            }
 +            else
 +            {
 +                generation = now;
 +            }
 +        }
 +
 +        req = "INSERT INTO system.%s (key, gossip_generation) VALUES ('%s', %d)";
 +        processInternal(String.format(req, LOCAL_CF, LOCAL_KEY, generation));
 +        forceBlockingFlush(LOCAL_CF);
 +
 +        return generation;
 +    }
 +
 +    public static BootstrapState getBootstrapState()
 +    {
 +        String req = "SELECT bootstrapped FROM system.%s WHERE key='%s'";
 +        UntypedResultSet result = processInternal(String.format(req, LOCAL_CF, LOCAL_KEY));
 +
 +        if (result.isEmpty() || !result.one().has("bootstrapped"))
 +            return BootstrapState.NEEDS_BOOTSTRAP;
 +
 +        return BootstrapState.valueOf(result.one().getString("bootstrapped"));
 +    }
 +
 +    public static boolean bootstrapComplete()
 +    {
 +        return getBootstrapState() == BootstrapState.COMPLETED;
 +    }
 +
 +    public static boolean bootstrapInProgress()
 +    {
 +        return getBootstrapState() == BootstrapState.IN_PROGRESS;
 +    }
 +
 +    public static void setBootstrapState(BootstrapState state)
 +    {
 +        String req = "INSERT INTO system.%s (key, bootstrapped) VALUES ('%s', '%s')";
 +        processInternal(String.format(req, LOCAL_CF, LOCAL_KEY, state.name()));
 +        forceBlockingFlush(LOCAL_CF);
 +    }
 +
 +    public static boolean isIndexBuilt(String keyspaceName, String indexName)
 +    {
 +        ColumnFamilyStore cfs = Keyspace.open(Keyspace.SYSTEM_KS).getColumnFamilyStore(INDEX_CF);
 +        QueryFilter filter = QueryFilter.getNamesFilter(decorate(ByteBufferUtil.bytes(keyspaceName)),
 +                                                        INDEX_CF,
 +                                                        ByteBufferUtil.bytes(indexName),
 +                                                        System.currentTimeMillis());
 +        return ColumnFamilyStore.removeDeleted(cfs.getColumnFamily(filter), Integer.MAX_VALUE)
!= null;
 +    }
 +
 +    public static void setIndexBuilt(String keyspaceName, String indexName)
 +    {
 +        ColumnFamily cf = ArrayBackedSortedColumns.factory.create(Keyspace.SYSTEM_KS, INDEX_CF);
 +        cf.addColumn(new Column(ByteBufferUtil.bytes(indexName), ByteBufferUtil.EMPTY_BYTE_BUFFER,
FBUtilities.timestampMicros()));
 +        RowMutation rm = new RowMutation(Keyspace.SYSTEM_KS, ByteBufferUtil.bytes(keyspaceName),
cf);
 +        rm.apply();
-         forceBlockingFlush(INDEX_CF);
 +    }
 +
 +    public static void setIndexRemoved(String keyspaceName, String indexName)
 +    {
 +        RowMutation rm = new RowMutation(Keyspace.SYSTEM_KS, ByteBufferUtil.bytes(keyspaceName));
 +        rm.delete(INDEX_CF, ByteBufferUtil.bytes(indexName), FBUtilities.timestampMicros());
 +        rm.apply();
-         forceBlockingFlush(INDEX_CF);
 +    }
 +
 +    /**
 +     * Read the host ID from the system keyspace, creating (and storing) one if
 +     * none exists.
 +     */
 +    public static UUID getLocalHostId()
 +    {
 +        UUID hostId = null;
 +
 +        String req = "SELECT host_id FROM system.%s WHERE key='%s'";
 +        UntypedResultSet result = processInternal(String.format(req, LOCAL_CF, LOCAL_KEY));
 +
 +        // Look up the Host UUID (return it if found)
 +        if (!result.isEmpty() && result.one().has("host_id"))
 +        {
 +            return result.one().getUUID("host_id");
 +        }
 +
 +        // ID not found, generate a new one, persist, and then return it.
 +        hostId = UUID.randomUUID();
 +        logger.warn("No host ID found, created {} (Note: This should happen exactly once
per node).", hostId);
 +        return setLocalHostId(hostId);
 +    }
 +
 +    /**
 +     * Sets the local host ID explicitly.  Should only be called outside of SystemTable
when replacing a node.
 +     */
 +    public static UUID setLocalHostId(UUID hostId)
 +    {
 +        String req = "INSERT INTO system.%s (key, host_id) VALUES ('%s', %s)";
 +        processInternal(String.format(req, LOCAL_CF, LOCAL_KEY, hostId));
 +        return hostId;
 +    }
 +
 +    /**
 +     * Read the current local node id from the system keyspace or null if no
 +     * such node id is recorded.
 +     */
 +    public static CounterId getCurrentLocalCounterId()
 +    {
 +        Keyspace keyspace = Keyspace.open(Keyspace.SYSTEM_KS);
 +
 +        // Get the last CounterId (since CounterId are timeuuid is thus ordered from the
older to the newer one)
 +        QueryFilter filter = QueryFilter.getSliceFilter(decorate(ALL_LOCAL_NODE_ID_KEY),
 +                                                        COUNTER_ID_CF,
 +                                                        ByteBufferUtil.EMPTY_BYTE_BUFFER,
 +                                                        ByteBufferUtil.EMPTY_BYTE_BUFFER,
 +                                                        true,
 +                                                        1,
 +                                                        System.currentTimeMillis());
 +        ColumnFamily cf = keyspace.getColumnFamilyStore(COUNTER_ID_CF).getColumnFamily(filter);
 +        if (cf != null && cf.getColumnCount() != 0)
 +            return CounterId.wrap(cf.iterator().next().name());
 +        else
 +            return null;
 +    }
 +
 +    /**
 +     * Write a new current local node id to the system keyspace.
 +     *
 +     * @param newCounterId the new current local node id to record
 +     * @param now microsecond time stamp.
 +     */
 +    public static void writeCurrentLocalCounterId(CounterId newCounterId, long now)
 +    {
 +        ByteBuffer ip = ByteBuffer.wrap(FBUtilities.getBroadcastAddress().getAddress());
 +
 +        ColumnFamily cf = ArrayBackedSortedColumns.factory.create(Keyspace.SYSTEM_KS, COUNTER_ID_CF);
 +        cf.addColumn(new Column(newCounterId.bytes(), ip, now));
 +        RowMutation rm = new RowMutation(Keyspace.SYSTEM_KS, ALL_LOCAL_NODE_ID_KEY, cf);
 +        rm.apply();
 +        forceBlockingFlush(COUNTER_ID_CF);
 +    }
 +
 +    public static List<CounterId.CounterIdRecord> getOldLocalCounterIds()
 +    {
 +        List<CounterId.CounterIdRecord> l = new ArrayList<CounterId.CounterIdRecord>();
 +
 +        Keyspace keyspace = Keyspace.open(Keyspace.SYSTEM_KS);
 +        QueryFilter filter = QueryFilter.getIdentityFilter(decorate(ALL_LOCAL_NODE_ID_KEY),
COUNTER_ID_CF, System.currentTimeMillis());
 +        ColumnFamily cf = keyspace.getColumnFamilyStore(COUNTER_ID_CF).getColumnFamily(filter);
 +
 +        CounterId previous = null;
 +        for (Column c : cf)
 +        {
 +            if (previous != null)
 +                l.add(new CounterId.CounterIdRecord(previous, c.timestamp()));
 +
 +            // this will ignore the last column on purpose since it is the
 +            // current local node id
 +            previous = CounterId.wrap(c.name());
 +        }
 +        return l;
 +    }
 +
 +    /**
 +     * @param cfName The name of the ColumnFamily responsible for part of the schema (keyspace,
ColumnFamily, columns)
 +     * @return CFS responsible to hold low-level serialized schema
 +     */
 +    public static ColumnFamilyStore schemaCFS(String cfName)
 +    {
 +        return Keyspace.open(Keyspace.SYSTEM_KS).getColumnFamilyStore(cfName);
 +    }
 +
 +    public static List<Row> serializedSchema()
 +    {
 +        List<Row> schema = new ArrayList<>();
 +
 +        schema.addAll(serializedSchema(SCHEMA_KEYSPACES_CF));
 +        schema.addAll(serializedSchema(SCHEMA_COLUMNFAMILIES_CF));
 +        schema.addAll(serializedSchema(SCHEMA_COLUMNS_CF));
 +        schema.addAll(serializedSchema(SCHEMA_TRIGGERS_CF));
 +
 +        return schema;
 +    }
 +
 +    /**
 +     * @param schemaCfName The name of the ColumnFamily responsible for part of the schema
(keyspace, ColumnFamily, columns)
 +     * @return low-level schema representation (each row represents individual Keyspace
or ColumnFamily)
 +     */
 +    public static List<Row> serializedSchema(String schemaCfName)
 +    {
 +        Token minToken = StorageService.getPartitioner().getMinimumToken();
 +
 +        return schemaCFS(schemaCfName).getRangeSlice(new Range<RowPosition>(minToken.minKeyBound(),
minToken.maxKeyBound()),
 +                                                     null,
 +                                                     new IdentityQueryFilter(),
 +                                                     Integer.MAX_VALUE,
 +                                                     System.currentTimeMillis());
 +    }
 +
 +    public static Collection<RowMutation> serializeSchema()
 +    {
 +        Map<DecoratedKey, RowMutation> mutationMap = new HashMap<>();
 +
 +        serializeSchema(mutationMap, SCHEMA_KEYSPACES_CF);
 +        serializeSchema(mutationMap, SCHEMA_COLUMNFAMILIES_CF);
 +        serializeSchema(mutationMap, SCHEMA_COLUMNS_CF);
 +        serializeSchema(mutationMap, SCHEMA_TRIGGERS_CF);
 +
 +        return mutationMap.values();
 +    }
 +
 +    private static void serializeSchema(Map<DecoratedKey, RowMutation> mutationMap,
String schemaCfName)
 +    {
 +        for (Row schemaRow : serializedSchema(schemaCfName))
 +        {
 +            if (Schema.ignoredSchemaRow(schemaRow))
 +                continue;
 +
 +            RowMutation mutation = mutationMap.get(schemaRow.key);
 +            if (mutation == null)
 +            {
 +                mutation = new RowMutation(Keyspace.SYSTEM_KS, schemaRow.key.key);
 +                mutationMap.put(schemaRow.key, mutation);
 +            }
 +
 +            mutation.add(schemaRow.cf);
 +        }
 +    }
 +
 +    public static Map<DecoratedKey, ColumnFamily> getSchema(String cfName)
 +    {
 +        Map<DecoratedKey, ColumnFamily> schema = new HashMap<DecoratedKey, ColumnFamily>();
 +
 +        for (Row schemaEntity : SystemKeyspace.serializedSchema(cfName))
 +            schema.put(schemaEntity.key, schemaEntity.cf);
 +
 +        return schema;
 +    }
 +
 +    public static ByteBuffer getSchemaKSKey(String ksName)
 +    {
 +        return AsciiType.instance.fromString(ksName);
 +    }
 +
 +    public static Row readSchemaRow(String ksName)
 +    {
 +        DecoratedKey key = StorageService.getPartitioner().decorateKey(getSchemaKSKey(ksName));
 +
 +        ColumnFamilyStore schemaCFS = SystemKeyspace.schemaCFS(SCHEMA_KEYSPACES_CF);
 +        ColumnFamily result = schemaCFS.getColumnFamily(QueryFilter.getIdentityFilter(key,
SCHEMA_KEYSPACES_CF, System.currentTimeMillis()));
 +
 +        return new Row(key, result);
 +    }
 +
 +    /**
 +     * Fetches a subset of schema (table data, columns metadata or triggers) for the keyspace+table
pair.
 +     *
 +     * @param schemaCfName the schema table to get the data from (schema_columnfamilies,
schema_columns or schema_triggers)
 +     * @param ksName the keyspace of the table we are interested in
 +     * @param cfName the table we are interested in
 +     * @return a Row containing the schema data of a particular type for the table
 +     */
 +    public static Row readSchemaRow(String schemaCfName, String ksName, String cfName)
 +    {
 +        DecoratedKey key = StorageService.getPartitioner().decorateKey(getSchemaKSKey(ksName));
 +        ColumnFamilyStore schemaCFS = SystemKeyspace.schemaCFS(schemaCfName);
 +        ColumnFamily cf = schemaCFS.getColumnFamily(key,
 +                                                    DefsTables.searchComposite(cfName, true),
 +                                                    DefsTables.searchComposite(cfName, false),
 +                                                    false,
 +                                                    Integer.MAX_VALUE,
 +                                                    System.currentTimeMillis());
 +        return new Row(key, cf);
 +    }
 +
 +    public static PaxosState loadPaxosState(ByteBuffer key, CFMetaData metadata)
 +    {
 +        String req = "SELECT * FROM system.%s WHERE row_key = 0x%s AND cf_id = %s";
 +        UntypedResultSet results = processInternal(String.format(req, PAXOS_CF, ByteBufferUtil.bytesToHex(key),
metadata.cfId));
 +        if (results.isEmpty())
 +            return new PaxosState(key, metadata);
 +        UntypedResultSet.Row row = results.one();
 +        Commit promised = row.has("in_progress_ballot")
 +                        ? new Commit(key, row.getUUID("in_progress_ballot"), EmptyColumns.factory.create(metadata))
 +                        : Commit.emptyCommit(key, metadata);
 +        // either we have both a recently accepted ballot and update or we have neither
 +        Commit accepted = row.has("proposal")
 +                        ? new Commit(key, row.getUUID("proposal_ballot"), ColumnFamily.fromBytes(row.getBytes("proposal")))
 +                        : Commit.emptyCommit(key, metadata);
 +        // either most_recent_commit and most_recent_commit_at will both be set, or neither
 +        Commit mostRecent = row.has("most_recent_commit")
 +                          ? new Commit(key, row.getUUID("most_recent_commit_at"), ColumnFamily.fromBytes(row.getBytes("most_recent_commit")))
 +                          : Commit.emptyCommit(key, metadata);
 +        return new PaxosState(promised, accepted, mostRecent);
 +    }
 +
 +    public static void savePaxosPromise(Commit promise)
 +    {
 +        String req = "UPDATE %s USING TIMESTAMP %d AND TTL %d SET in_progress_ballot = %s
WHERE row_key = 0x%s AND cf_id = %s";
 +        processInternal(String.format(req,
 +                                      PAXOS_CF,
 +                                      UUIDGen.microsTimestamp(promise.ballot),
 +                                      paxosTtl(promise.update.metadata),
 +                                      promise.ballot,
 +                                      ByteBufferUtil.bytesToHex(promise.key),
 +                                      promise.update.id()));
 +    }
 +
 +    public static void savePaxosProposal(Commit proposal)
 +    {
 +        processInternal(String.format("UPDATE %s USING TIMESTAMP %d AND TTL %d SET proposal_ballot
= %s, proposal = 0x%s WHERE row_key = 0x%s AND cf_id = %s",
 +                                      PAXOS_CF,
 +                                      UUIDGen.microsTimestamp(proposal.ballot),
 +                                      paxosTtl(proposal.update.metadata),
 +                                      proposal.ballot,
 +                                      ByteBufferUtil.bytesToHex(proposal.update.toBytes()),
 +                                      ByteBufferUtil.bytesToHex(proposal.key),
 +                                      proposal.update.id()));
 +    }
 +
 +    private static int paxosTtl(CFMetaData metadata)
 +    {
 +        // keep paxos state around for at least 3h
 +        return Math.max(3 * 3600, metadata.getGcGraceSeconds());
 +    }
 +
 +    public static void savePaxosCommit(Commit commit)
 +    {
 +        // We always erase the last proposal (with the commit timestamp to no erase more
recent proposal in case the commit is old)
 +        // even though that's really just an optimization  since SP.beginAndRepairPaxos
will exclude accepted proposal older than the mrc.
 +        String cql = "UPDATE %s USING TIMESTAMP %d AND TTL %d SET proposal_ballot = null,
proposal = null, most_recent_commit_at = %s, most_recent_commit = 0x%s WHERE row_key = 0x%s
AND cf_id = %s";
 +        processInternal(String.format(cql,
 +                                      PAXOS_CF,
 +                                      UUIDGen.microsTimestamp(commit.ballot),
 +                                      paxosTtl(commit.update.metadata),
 +                                      commit.ballot,
 +                                      ByteBufferUtil.bytesToHex(commit.update.toBytes()),
 +                                      ByteBufferUtil.bytesToHex(commit.key),
 +                                      commit.update.id()));
 +    }
 +
 +    /**
 +     * Returns a RestorableMeter tracking the average read rate of a particular SSTable,
restoring the last-seen rate
 +     * from values in system.sstable_activity if present.
 +     * @param keyspace the keyspace the sstable belongs to
 +     * @param table the table the sstable belongs to
 +     * @param generation the generation number for the sstable
 +     */
 +    public static RestorableMeter getSSTableReadMeter(String keyspace, String table, int
generation)
 +    {
 +        String cql = "SELECT * FROM %s WHERE keyspace_name='%s' and columnfamily_name='%s'
and generation=%d";
 +        UntypedResultSet results = processInternal(String.format(cql,
 +                                                                 SSTABLE_ACTIVITY_CF,
 +                                                                 keyspace,
 +                                                                 table,
 +                                                                 generation));
 +
 +        if (results.isEmpty())
 +            return new RestorableMeter();
 +
 +        UntypedResultSet.Row row = results.one();
 +        double m15rate = row.getDouble("rate_15m");
 +        double m120rate = row.getDouble("rate_120m");
 +        return new RestorableMeter(m15rate, m120rate);
 +    }
 +
 +    /**
 +     * Writes the current read rates for a given SSTable to system.sstable_activity
 +     */
 +    public static void persistSSTableReadMeter(String keyspace, String table, int generation,
RestorableMeter meter)
 +    {
 +        // Store values with a one-day TTL to handle corner cases where cleanup might not
occur
 +        String cql = "INSERT INTO %s (keyspace_name, columnfamily_name, generation, rate_15m,
rate_120m) VALUES ('%s', '%s', %d, %f, %f) USING TTL 864000";
 +        processInternal(String.format(cql,
 +                                      SSTABLE_ACTIVITY_CF,
 +                                      keyspace,
 +                                      table,
 +                                      generation,
 +                                      meter.fifteenMinuteRate(),
 +                                      meter.twoHourRate()));
 +    }
 +
 +    /**
 +     * Clears persisted read rates from system.sstable_activity for SSTables that have been
deleted.
 +     */
 +    public static void clearSSTableReadMeter(String keyspace, String table, int generation)
 +    {
 +        String cql = "DELETE FROM %s WHERE keyspace_name='%s' AND columnfamily_name='%s'
and generation=%d";
 +        processInternal(String.format(cql, SSTABLE_ACTIVITY_CF, keyspace, table, generation));
 +    }
 +}


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