Looks related to CASSANDRA-1559 https://issues.apache.org/jira/browse/CASSANDRA-1559 which should be fixed in 0.7.4

However everyone said it should not happen. Can you provide some more detail about what you did to cause this to happen. 

Aaron

On 14 Mar 2011, at 06:47, ruslan usifov wrote:

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)