Hello in working cluster of cassandra 0.7.3 in system.log i see 2 simular errors:
ERROR [ReadStage:12] 2011-03-13 20:27:20,431 AbstractCassandraDaemon.java (line 114) Fatal exception in thread Thread[ReadStage:12,5,m ain] java.lang.NullPointerException at org.apache.cassandra.db.Column.reconcile(Column.java:177) at org.apache.cassandra.db.SuperColumn.addColumn(SuperColumn.java:179) at org.apache.cassandra.db.SuperColumn.putColumn(SuperColumn.java:195) at org.apache.cassandra.db.ColumnFamily.addColumn(ColumnFamily.java:220) at org.apache.cassandra.db.filter.QueryFilter$2.reduce(QueryFilter.java:118) at org.apache.cassandra.db.filter.QueryFilter$2.reduce(QueryFilter.java:108) at org.apache.cassandra.utils.ReducingIterator.computeNext(ReducingIterator.java:62) at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:136) at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:131) at org.apache.cassandra.db.filter.SliceQueryFilter.collectReducedColumns(SliceQueryFilter.java:118) at org.apache.cassandra.db.filter.QueryFilter.collectCollatedColumns(QueryFilter.java:142) at org.apache.cassandra.db.ColumnFamilyStore.getTopLevelColumns(ColumnFamilyStore.java:1326) at org.apache.cassandra.db.ColumnFamilyStore.getColumnFamily(ColumnFamilyStore.java:1203) at org.apache.cassandra.db.ColumnFamilyStore.getColumnFamily(ColumnFamilyStore.java:1131) at org.apache.cassandra.db.Table.getRow(Table.java:333) at org.apache.cassandra.db.SliceFromReadCommand.getRow(SliceFromReadCommand.java:63) at org.apache.cassandra.db.ReadVerbHandler.doVerb(ReadVerbHandler.java:69) at org.apache.cassandra.net.MessageDeliveryTask.run(MessageDeliveryTask.java:72) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:662)