Esempio n. 1
0
    /**
     * if initialtoken was specified, use that (split on comma).
     * otherwise, if num_tokens == 1, pick a token to assume half the load of the most-loaded node.
     * else choose num_tokens tokens at random
     */
    public static Collection<Token> getBootstrapTokens(final TokenMetadata metadata) throws ConfigurationException
    {
        Collection<String> initialTokens = DatabaseDescriptor.getInitialTokens();
        // if user specified tokens, use those
        if (initialTokens.size() > 0)
        {
            logger.debug("tokens manually specified as {}",  initialTokens);
            List<Token> tokens = new ArrayList<Token>(initialTokens.size());
            for (String tokenString : initialTokens)
            {
                Token token = StorageService.getPartitioner().getTokenFactory().fromString(tokenString);
                if (metadata.getEndpoint(token) != null)
                    throw new ConfigurationException("Bootstrapping to existing token " + tokenString + " is not allowed (decommission/removenode the old node first).");
                tokens.add(token);
            }
            return tokens;
        }

        int numTokens = DatabaseDescriptor.getNumTokens();
        if (numTokens < 1)
            throw new ConfigurationException("num_tokens must be >= 1");

        if (numTokens == 1)
            logger.warn("Picking random token for a single vnode.  You should probably add more vnodes; failing that, you should probably specify the token manually");

        return getRandomTokens(metadata, numTokens);
    }
Esempio n. 2
0
 public static Collection<Token> getRandomTokens(TokenMetadata metadata, int numTokens)
 {
     Set<Token> tokens = new HashSet<Token>(numTokens);
     while (tokens.size() < numTokens)
     {
         Token token = StorageService.getPartitioner().getRandomToken();
         if (metadata.getEndpoint(token) == null)
             tokens.add(token);
     }
     return tokens;
 }