I am quite new to cassandra and hector & trying to create a super column. I did already a lot of research, but somehow, nothing works so far. During my research on stackoverflow I found this question here, which seemed helpful for me. So I tried to insert the code for my example, but I'm getting an exception.
This is my code (Should be copy/pastable if you have hector) - sry if it might be not perfect readable, I did a lot of try-and-error before asking here:
import java.util.Arrays;
import me.prettyprint.cassandra.serializers.StringSerializer;
import me.prettyprint.cassandra.service.ThriftKsDef;
import me.prettyprint.cassandra.service.template.SuperCfTemplate;
import me.prettyprint.cassandra.service.template.SuperCfUpdater;
import me.prettyprint.cassandra.service.template.ThriftSuperCfTemplate;
import me.prettyprint.hector.api.Cluster;
import me.prettyprint.hector.api.Keyspace;
import me.prettyprint.hector.api.ddl.ColumnFamilyDefinition;
import me.prettyprint.hector.api.ddl.ComparatorType;
import me.prettyprint.hector.api.ddl.KeyspaceDefinition;
import me.prettyprint.hector.api.factory.HFactory;
public class DatabaseDataImporter {
private Cluster myCluster;
private KeyspaceDefinition keyspaceDefinition;
private Keyspace keyspace;
private SuperCfTemplate<String, String, String> template;
final static StringSerializer ss = StringSerializer.get();
public DatabaseDataImporter() {
initializeCluster();
SuperCfTemplate<String, String, String> template = new ThriftSuperCfTemplate<String, String, String>(
keyspace, "Nodes", ss, ss, ss);
SuperCfUpdater<String, String, String> updater = template
.createUpdater("key", "newcf");
updater.setString("subname", "1");
template.update(updater);
}
private void initializeCluster() {
// get Cluster
myCluster = HFactory.getOrCreateCluster("Test Cluster",
"localhost:9160");
keyspaceDefinition = myCluster.describeKeyspace("Graphs");
// If keyspace does not exist, the CFs don't exist either. => create
// them.
if (keyspaceDefinition == null) {
createSchema();
}
keyspace = HFactory.createKeyspace("Graphs", myCluster);
}
private void createSchema() {
// get Cluster
Cluster myCluster = HFactory.getOrCreateCluster("Test Cluster",
"localhost:9160");
// add Schema
int replicationFactor = 1;
ColumnFamilyDefinition cfDef = HFactory.createColumnFamilyDefinition(
"Graphs", "Nodes", ComparatorType.BYTESTYPE);
KeyspaceDefinition newKeyspace = HFactory.createKeyspaceDefinition(
"Graphs", ThriftKsDef.DEF_STRATEGY_CLASS, replicationFactor,
Arrays.asList(cfDef));
// Add the schema to the cluster.
// "true" as the second param means that Hector will block until all
// nodes see the change.
myCluster.addKeyspace(newKeyspace, true);
}
public static void main(String[] args) {
new DatabaseDataImporter();
}
}
The exception I get is:
Exception in thread "main" me.prettyprint.hector.api.exceptions.HInvalidRequestException: InvalidRequestException(why:supercolumn parameter is invalid for standard CF Nodes)
at me.prettyprint.cassandra.service.ExceptionsTranslatorImpl.translate(ExceptionsTranslatorImpl.java:52)
at me.prettyprint.cassandra.connection.HConnectionManager.operateWithFailover(HConnectionManager.java:260)
at me.prettyprint.cassandra.model.ExecutingKeyspace.doExecuteOperation(ExecutingKeyspace.java:113)
at me.prettyprint.cassandra.model.MutatorImpl.execute(MutatorImpl.java:243)
at me.prettyprint.cassandra.service.template.AbstractColumnFamilyTemplate.executeBatch(AbstractColumnFamilyTemplate.java:115)
at me.prettyprint.cassandra.service.template.AbstractColumnFamilyTemplate.executeIfNotBatched(AbstractColumnFamilyTemplate.java:159)
at me.prettyprint.cassandra.service.template.SuperCfTemplate.update(SuperCfTemplate.java:203)
at algorithms.DatabaseDataImporter.<init>(DatabaseDataImporter.java:43)
at algorithms.DatabaseDataImporter.main(DatabaseDataImporter.java:87)
Caused by: InvalidRequestException(why:supercolumn parameter is invalid for standard CF Nodes)
at org.apache.cassandra.thrift.Cassandra$batch_mutate_result.read(Cassandra.java:20833)
at org.apache.thrift.TServiceClient.receiveBase(TServiceClient.java:78)
at org.apache.cassandra.thrift.Cassandra$Client.recv_batch_mutate(Cassandra.java:964)
at org.apache.cassandra.thrift.Cassandra$Client.batch_mutate(Cassandra.java:950)
at me.prettyprint.cassandra.model.MutatorImpl$3.execute(MutatorImpl.java:246)
at me.prettyprint.cassandra.model.MutatorImpl$3.execute(MutatorImpl.java:243)
at me.prettyprint.cassandra.service.Operation.executeAndSetResult(Operation.java:104)
at me.prettyprint.cassandra.connection.HConnectionManager.operateWithFailover(HConnectionManager.java:253)
... 7 more
I can understand that I somehow do a bad thing because I'm attempting to insert a supercolumninto a standardcolumnfamily. (Source for this is here). So maybe this is the code where everything gets broken during creation:
ColumnFamilyDefinition cfDef = HFactory.createColumnFamilyDefinition(
"Graphs", "Nodes", ComparatorType.BYTESTYPE);
And this is the point where I don't know how to proceed. I tried to find a "SuperColumnFamilyDefinition"-class but I couldn't find it. Do you have any ideas or suggestions what I need to change to fix my code? I would be very happy.
Thanks a lot for every thought you're sharing with me.
I found the answer to my problem and would like to share (Maybe it helps someone in the future). As I thought the solution was quite simple.
ColumnFamilyDefinition cfDef = HFactory.createColumnFamilyDefinition(
"Graphs", "Nodes", ComparatorType.BYTESTYPE);
needed to be extended to
ColumnFamilyDefinition cfDef = HFactory.createColumnFamilyDefinition(
"Graphs", "Nodes", ComparatorType.BYTESTYPE);
// defines it as super column
((ThriftCfDef) cfDef).setColumnType(ColumnType.SUPER);