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From Ramzi Rabah <rra...@playdom.com>
Subject Remove not working for me
Date Fri, 09 Oct 2009 00:33:03 GMT
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

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