private PreparedStatement getCachedPreparedStatement(final String cql) {
final CachedPreparedStatementCreator cachedPreparedStatementCreator =
new CachedPreparedStatementCreator(cql);
final PreparedStatement preparedStatement =
cachedPreparedStatementCreator.createPreparedStatement(cassandraTemplate.getSession());
preparedStatement.setConsistencyLevel(ConsistencyLevel.ONE);
return preparedStatement;
}
public static void waitForSchemaVersionsToCoalesce(
String encapsulatingOperationDescription, CQLKeyValueService kvs) {
PreparedStatement peerInfoQuery =
kvs.getPreparedStatement(
CassandraConstants.NO_TABLE,
"select peer, schema_version from system.peers;",
kvs.session);
peerInfoQuery.setConsistencyLevel(ConsistencyLevel.ALL);
Multimap<UUID, InetAddress> peerInfo = ArrayListMultimap.create();
long start = System.currentTimeMillis();
long sleepTime = 100;
do {
peerInfo.clear();
for (Row row : kvs.session.execute(peerInfoQuery.bind()).all()) {
peerInfo.put(row.getUUID("schema_version"), row.getInet("peer"));
}
if (peerInfo.keySet().size() <= 1) { // full schema agreement
return;
}
sleepTime = Math.min(sleepTime * 2, 5000);
} while (System.currentTimeMillis()
< start + CassandraConstants.SECONDS_WAIT_FOR_VERSIONS * 1000);
StringBuilder sb = new StringBuilder();
sb.append(
String.format(
"Cassandra cluster cannot come to agreement on schema versions, during operation: %s.",
encapsulatingOperationDescription));
for (Entry<UUID, Collection<InetAddress>> versionToPeer : peerInfo.asMap().entrySet()) {
sb.append(String.format("\nAt schema version %s:", versionToPeer.getKey()));
for (InetAddress peer : versionToPeer.getValue()) {
sb.append(String.format("\n\tNode: %s", peer));
}
}
sb.append(
"\nFind the nodes above that diverge from the majority schema "
+ "(or have schema 'UNKNOWN', which likely means they are down/unresponsive) "
+ "and examine their logs to determine the issue. Fixing the underlying issue and restarting Cassandra "
+ "should resolve the problem. You can quick-check this with 'nodetool describecluster'.");
throw new IllegalStateException(sb.toString());
}
