Jacob Rhoden created CASSANDRA-6371:
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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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