In the CQL3 protocol the sizes of collections are unsigned shorts, so the maximum number of elements in a LIST<...> is 65,536. There's no check, afaik, that stops you from creating lists that are bigger than that, but the protocol doesn't handle returning them (you get the first N - 65536 % 65536 items).
On the other hand the JDBC driver doesn't talk over the binary protocol but Thrift, doesn't it? In that case there may be other limits. T# On Mon, May 13, 2013 at 3:26 AM, Edward Capriolo <edlinuxg...@gmail.com>wrote: > 2 billion is the maximum theoretically limit of columns under a row. It is > NOT the maximum limit of a CQL collection. The design of CQL collections > currently require retrieving the entire collection on read. > > > On Sun, May 12, 2013 at 11:13 AM, Robert Wille <rwi...@footnote.com>wrote: > >> I designed a data model for my data that uses a list of UUID's in a >> column. When I designed my data model, my expectation was that most of the >> lists would have fewer than a hundred elements, with a few having several >> thousand. I discovered in my data a list that has nearly 400,000 items in >> it. When I try to retrieve it, I get the following exception: >> >> java.lang.IllegalArgumentException: Illegal Capacity: -14594 >> at java.util.ArrayList.<init>(ArrayList.java:110) >> at >> org.apache.cassandra.cql.jdbc.ListMaker.compose(ListMaker.java:54) >> at >> org.apache.cassandra.cql.jdbc.TypedColumn.<init>(TypedColumn.java:68) >> at >> >> org.apache.cassandra.cql.jdbc.CassandraResultSet.createColumn(CassandraResu >> ltSet.java:1086) >> at >> >> org.apache.cassandra.cql.jdbc.CassandraResultSet.populateColumns(CassandraR >> esultSet.java:161) >> at >> >> org.apache.cassandra.cql.jdbc.CassandraResultSet.<init>(CassandraResultSet. >> java:134) >> at >> >> org.apache.cassandra.cql.jdbc.CassandraStatement.doExecute(CassandraStateme >> nt.java:166) >> at >> >> org.apache.cassandra.cql.jdbc.CassandraStatement.executeQuery(CassandraStat >> ement.java:226) >> >> >> I get this with Cassandra 1.2.4 and the latest snapshot of the JDBC >> driver. Admittedly, several hundred thousand is quite a lot of items, but >> odd that I'm getting some kind of wraparound, since 400,000 is a long ways >> from 2 billion. >> >> What are the physical and practical limits on the size of a list? Is it >> possible to retrieve a range of items from a list? >> >> Thanks in advance >> >> Robert >> >> >> >
