import org.apache.cassandra.dht.BootStrapper; //导入依赖的package包/类
private void bootstrap(Collection<Token> tokens)
{
    isBootstrapMode = true;
    SystemKeyspace.updateTokens(tokens); // DON'T use setToken, that makes us part of the ring locally which is incorrect until we are done bootstrapping
    if (!DatabaseDescriptor.isReplacing())
    {
        // if not an existing token then bootstrap
        List<Pair<ApplicationState, VersionedValue>> states = new ArrayList<Pair<ApplicationState, VersionedValue>>();
        states.add(Pair.create(ApplicationState.TOKENS, valueFactory.tokens(tokens)));
        states.add(Pair.create(ApplicationState.STATUS, valueFactory.bootstrapping(tokens)));
        Gossiper.instance.addLocalApplicationStates(states);
        setMode(Mode.JOINING, "sleeping " + RING_DELAY + " ms for pending range setup", true);
        Uninterruptibles.sleepUninterruptibly(RING_DELAY, TimeUnit.MILLISECONDS);
    }
    else
    {
        // Dont set any state for the node which is bootstrapping the existing token...
        tokenMetadata.updateNormalTokens(tokens, FBUtilities.getBroadcastAddress());
        SystemKeyspace.removeEndpoint(DatabaseDescriptor.getReplaceAddress());
    }
    if (!Gossiper.instance.seenAnySeed())
        throw new IllegalStateException("Unable to contact any seeds!");
    setMode(Mode.JOINING, "Starting to bootstrap...", true);
    new BootStrapper(FBUtilities.getBroadcastAddress(), tokens, tokenMetadata).bootstrap(); // handles token update
    logger.info("Bootstrap completed! for the tokens {}", tokens);
}
 

import org.apache.cassandra.dht.BootStrapper; //导入依赖的package包/类
@Before
public void resetGcGraceSeconds()
{
    TokenMetadata tokenMeta = StorageService.instance.getTokenMetadata();
    InetAddress local = FBUtilities.getBroadcastAddress();
    tokenMeta.clearUnsafe();
    tokenMeta.updateHostId(UUID.randomUUID(), local);
    tokenMeta.updateNormalTokens(BootStrapper.getRandomTokens(tokenMeta, 1), local);

    for (CFMetaData table : Schema.instance.getTablesAndViews(KEYSPACE))
        table.gcGraceSeconds(TableParams.DEFAULT_GC_GRACE_SECONDS);
}