Was this using one of the included stress tests or your own system ? 

If it was something from contrib/ what was the command line you used?

If you own system what was the schema and what was the tests doing ?

If it's reproducible could you create a ticket here https://issues.apache.org/jira/browse/CASSANDRA

Thanks
Aaron

On 4 Apr 2011, at 05:32, Donal Zang wrote:

Hi,

I'm doing a stress test, and cassandra crashed with this Exception:
ERROR [MutationStage:9] 2011-04-03 21:11:50,152
DebuggableThreadPoolExecutor.java (line 103) Error in ThreadPoolExecutor
java.lang.NullPointerException
       at
org.apache.cassandra.io.sstable.IndexSummary$KeyPosition.compareTo(IndexSummary.java:100)
       at
org.apache.cassandra.io.sstable.IndexSummary$KeyPosition.compareTo(IndexSummary.java:87)
       at java.util.Collections.indexedBinarySearch(Collections.java:232)
       at java.util.Collections.binarySearch(Collections.java:218)
       at
org.apache.cassandra.io.sstable.SSTableReader.getIndexScanPosition(SSTableReader.java:333)
       at
org.apache.cassandra.io.sstable.SSTableReader.getPosition(SSTableReader.java:459)
       at
org.apache.cassandra.io.sstable.SSTableReader.getFileDataInput(SSTableReader.java:563)
       at
org.apache.cassandra.db.columniterator.SSTableNamesIterator.<init>(SSTableNamesIterator.java:61)
       at
org.apache.cassandra.db.filter.NamesQueryFilter.getSSTableColumnIterator(NamesQueryFilter.java:58)
       at
org.apache.cassandra.db.filter.QueryFilter.getSSTableColumnIterator(QueryFilter.java:80)
       at
org.apache.cassandra.db.ColumnFamilyStore.getTopLevelColumns(ColumnFamilyStore.java:1353)
       at
org.apache.cassandra.db.ColumnFamilyStore.getColumnFamily(ColumnFamilyStore.java:1245)
       at
org.apache.cassandra.db.ColumnFamilyStore.getColumnFamily(ColumnFamilyStore.java:1173)
       at
org.apache.cassandra.db.Table.readCurrentIndexedColumns(Table.java:459)
       at org.apache.cassandra.db.Table.apply(Table.java:394)
       at
org.apache.cassandra.db.RowMutationVerbHandler.doVerb(RowMutationVerbHandler.java:76)
       at
org.apache.cassandra.net.MessageDeliveryTask.run(MessageDeliveryTask.java:72)
       at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
       at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
       at java.lang.Thread.run(Thread.java:636)

--

Donal Zang
CERN PH-ADP-DDM 40-3-D16
CH-1211 Geneve 23
donal.zang@cern.ch
+41 22 76 71268