Hello all,
I am trying to test Cassandra for deploying it in production in our
company, and I am very pleased with the performance of the
reads/writes on Columns. I did run into an issue with the API though
while trying to play with supercolumns. Here is my code:
// Creating a supercolumn with name = "key" and columns ("value", "created").
long now = System.currentTimeMillis();
byte[] keyAsBytes = key.getBytes();
ColumnOrSuperColumn colOrSuperCol = new ColumnOrSuperColumn();
SuperColumn superCol = new SuperColumn();
colOrSuperCol.setSuper_column(superCol);
superCol.setName(keyAsBytes);
List<Column> cols = new ArrayList<Column>();
// first the key/value pair
Column col = new Column();
col.setName("value".getBytes());
col.setValue(value);
cols.add(col);
// then the time created
col = new Column();
col.setName("created".getBytes());
col.setValue((now + "").getBytes());
cols.add(col);
superCol.setColumns(cols);
Map<String, List<ColumnOrSuperColumn>> map = new
HashMap<String, List<ColumnOrSuperColumn>>();
List<ColumnOrSuperColumn> list = new ArrayList<ColumnOrSuperColumn>();
list.add(colOrSuperCol);
map.put(COLUMN_FAMILY_NAME, list);
client.batch_insert(KEYSPACE_NAME, key, map, ConsistencyLevel.ONE);
// The GET of the supercolumn
SlicePredicate predicate = new SlicePredicate(null, new
SliceRange(new byte
[0], new byte[0], false, 2));
ColumnParent parent = new ColumnParent(COLUMN_FAMILY_NAME,
key.getBytes());
List<ColumnOrSuperColumn> columns = null;
columns = client.get_slice(KEYSPACE_NAME, key,
parent, predicate, ConsistencyLevel.ONE);
// delete the supercolumn
client.remove(KEYSPACE_NAME, key,new
ColumnPath(COLUMN_FAMILY_NAME, null, null),
System.currentTimeMillis(),ConsistencyLevel.ONE);
// Do the get again
When I try to delete the super column and then I try to read it again,
I get an exception thrown by cassandra
org.apache.thrift.TApplicationException: Internal error processing get_slice
at
org.apache.thrift.TApplicationException.read(TApplicationException.java:107)
at
org.apache.cassandra.service.Cassandra$Client.recv_get_slice(Cassandra.java:171)
at
org.apache.cassandra.service.Cassandra$Client.get_slice(Cassandra.java:150)
at
com.playdom.cassandra.datastore.CassandraDataStore.testGet(CassandraDataStore.java:233)
at
com.playdom.cassandra.test.TestCassandraDataStore.testSetAndGetTrial(TestCassandraDataStore.java:58)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at junit.framework.TestCase.runTest(TestCase.java:168)
at junit.framework.TestCase.runBare(TestCase.java:134)
at junit.framework.TestResult$1.protect(TestResult.java:110)
at junit.framework.TestResult.runProtected(TestResult.java:128)
at junit.framework.TestResult.run(TestResult.java:113)
at junit.framework.TestCase.run(TestCase.java:124)
at junit.framework.TestSuite.runTest(TestSuite.java:232)
at junit.framework.TestSuite.run(TestSuite.java:227)
at junit.textui.TestRunner.doRun(TestRunner.java:116)
at
com.intellij.rt.execution.junit.IdeaTestRunner.doRun(IdeaTestRunner.java:94)
at junit.textui.TestRunner.doRun(TestRunner.java:109)
at
com.intellij.rt.execution.junit.IdeaTestRunner.startRunnerWithArgs(IdeaTestRunner.java:22)
at
com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:118)
at
com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:40)
I was expecting a NotFoundException() since I thought the read will
not find anything. Also anytime I try to rerun this after the delete I
always get an exception in the reads.
Am I doing something seriously wrong? Thanks a lot for your help
Ray
