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From "Jacob Rhoden (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-6371) cassandra-driver-core-2.0.0-rc1.jar fails in this case
Date Mon, 18 Nov 2013 20:17:22 GMT
Jacob Rhoden created CASSANDRA-6371:
---------------------------------------

             Summary: cassandra-driver-core-2.0.0-rc1.jar fails in this case
                 Key: CASSANDRA-6371
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6371
             Project: Cassandra
          Issue Type: Bug
          Components: Drivers (now out of tree)
            Reporter: Jacob Rhoden


Testing this out switching over to the new driver. Its mostly working except for one particular
query (or code?) is causing the following:

com.datastax.driver.core.exceptions.DriverInternalError: Tried to execute unknown prepared
query 0x67dfcaa71c14d42a0a7f62406b41ea3e
   com.datastax.driver.core.exceptions.DriverInternalError.copy():42
   com.datastax.driver.core.ResultSetFuture.extractCauseFromExecutionException():271
   com.datastax.driver.core.ResultSetFuture.getUninterruptibly():187
   com.datastax.driver.core.Session.execute():126
   tap.command.GetNewsFeed.execute():72
   tap.servlet.HomeServlet.doGet():38
   javax.servlet.http.HttpServlet.service():668

Anyone encounter this one before? Any suggestions? In case its relevant, line 72 is the for
loop statement:

		PreparedStatement p = s.prepare(
				"select uuid,to_uuid,to_first_name, to_last_name,from_uuid,from_first_name,from_last_name,action,message
"+
				"from news_feed " +
				"where person_uuid = ? " +
				"order by uuid desc " +
				"limit 50");
		PreparedStatement q = s.prepare("select count(*) from post_likes where post_uuid=?");
		PreparedStatement c = s.prepare("select comments from post_counters where uuid=?");
		PreparedStatement lq = s.prepare("select person_uuid from post_likes where post_uuid=? and
person_uuid=?");

		for(Row r : s.execute(p.bind(user.getPersonUuid()))) {
			Message m = new Message();
			Person to = new Person();
			to.setUuid(r.getUUID(1));
			to.setFirstName(r.getString(2));
			to.setLastName(r.getString(3));
			Person from = new Person();
			from.setUuid(r.getUUID(4));
			from.setFirstName(r.getString(5));
			from.setLastName(r.getString(6));
			m.setUuid(r.getUUID(0));
			m.setTo(to);
			m.setFrom(from);
			m.setAction(r.getString(7));
			m.setMessage(r.getString(8));
			results.add(m);
			m.setLikeCount((int)s.execute(q.bind(m.getUuid())).one().getLong(0));
			for(Row r2 : s.execute(c.bind(m.getUuid()))) {
				m.setCommentCount((int)r2.getLong(0));
			}
			m.setLiked(s.execute(lq.bind(m.getUuid(), user.getPersonUuid())).iterator().hasNext());
			m.setFromMe(from.getUuid().equals(user.getPersonUuid()));
			m.setToMe(to.getUuid().equals(user.getPersonUuid()));
		}

Reworking the code as follows avoids the problem:

	public List<Message> execute() throws IOException {
		List<Message> results = new LinkedList<>();

		Session s = api.getCassandraSession();
		PreparedStatement p = s.prepare(
				"select uuid,to_uuid,to_first_name, to_last_name,from_uuid,from_first_name,from_last_name,action,message
"+
				"from news_feed " +
				"where person_uuid = ? " +
				"order by uuid desc " +
				"limit 50");

		for(Row r : s.execute(p.bind(user.getPersonUuid()))) {
			Message m = new Message();
			Person to = new Person();
			to.setUuid(r.getUUID(1));
			to.setFirstName(r.getString(2));
			to.setLastName(r.getString(3));
			Person from = new Person();
			from.setUuid(r.getUUID(4));
			from.setFirstName(r.getString(5));
			from.setLastName(r.getString(6));
			m.setUuid(r.getUUID(0));
			m.setTo(to);
			m.setFrom(from);
			m.setAction(r.getString(7));
			m.setMessage(r.getString(8));
			results.add(m);
			m.setFromMe(from.getUuid().equals(user.getPersonUuid()));
			m.setToMe(to.getUuid().equals(user.getPersonUuid()));
		}

		PreparedStatement q = s.prepare("select count(*) from post_likes where post_uuid=?");
		PreparedStatement c = s.prepare("select comments from post_counters where uuid=?");
		PreparedStatement lq = s.prepare("select person_uuid from post_likes where post_uuid=? and
person_uuid=?");
		for(Message m : results) {
			m.setLikeCount((int)s.execute(q.bind(m.getUuid())).one().getLong(0));
			for(Row r2 : s.execute(c.bind(m.getUuid()))) {
				m.setCommentCount((int)r2.getLong(0));
			}
			m.setLiked(s.execute(lq.bind(m.getUuid(), user.getPersonUuid())).iterator().hasNext());
		}

		return results;
	}




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