Hi,

I am running into some problems with secondary indexes that I am unable to track down. When I restart the cassandra service, the secondary index data won't load and I get the following error during startup: 

INFO 08:29:42,127 Opening /var/myproject/cassandra/data/mykeyspace/group_admin/mykeyspace-group_admin.group_admin_groupId_idx-hd-1 (20808 bytes)
ERROR 08:29:42,159 Exception in thread Thread[SSTableBatchOpen:1,5,main]
java.lang.ClassCastException: java.math.BigInteger cannot be cast to java.nio.ByteBuffer
at org.apache.cassandra.db.marshal.TimeUUIDType.compare(TimeUUIDType.java:37)
at org.apache.cassandra.dht.LocalToken.compareTo(LocalToken.java:45)
at org.apache.cassandra.db.DecoratedKey.compareTo(DecoratedKey.java:89)
at org.apache.cassandra.db.DecoratedKey.compareTo(DecoratedKey.java:38)
at java.util.TreeMap.getEntry(TreeMap.java:328)
at java.util.TreeMap.containsKey(TreeMap.java:209)
at java.util.TreeSet.contains(TreeSet.java:217)
at org.apache.cassandra.io.sstable.SSTableReader.load(SSTableReader.java:396)
at org.apache.cassandra.io.sstable.SSTableReader.open(SSTableReader.java:187)
at org.apache.cassandra.io.sstable.SSTableReader$1.run(SSTableReader.java:225)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)

When the service starts I can still select data from the column family, but not using the secondary index. 
After I execute "nodetool rebuild_index" the secondary index works fine again until the next restart. 

The error only seems to occur on the column groupId (TimeUUIDType). The other index on userId seems to work. 

I have the following column family definition: 

create column family group_admin with
  comparator = UTF8Type and
  key_validation_class = UTF8Type and
  column_metadata = [
    {column_name: id, validation_class: UTF8Type},
    {column_name: added, validation_class: LongType},
    {column_name: userId, validation_class: BytesType, index_type: KEYS},
    {column_name: requestMessage, validation_class: UTF8Type},
    {column_name: status, validation_class: LongType},
    {column_name: groupId, validation_class: TimeUUIDType, index_type: KEYS}
  ];

Thank you very much for your help!

Ivo