/**
* 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);
}
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;
}